首页 > 最新文献

Journal of the Optical Society of America and Review of Scientific Instruments最新文献

英文 中文
Design of the scintillator imaging lens for the neutron imaging system at the 100 kJ-level laser facility. 100千焦级激光装置中子成像系统闪烁体成像透镜的设计。
Qiukai Li, Zhongjing Chen, T. Xu, Yadong Yan, Feng Wang, Junhua He
Deuterium-tritium neutron yield has reached up to about 1013 at the 100 kJ-level laser facility, which makes measurement of neutron emission images possible with the neutron imaging system. There are two methods to collect neutron images from the scintillator array, optical fiber taper and the lens system. Here, we report a design of the lens system for the neutron imaging system at the 100 kJ-level laser facility. The lens system, which consists of a nine-element collecting lens, with a spatial resolution of 20 µm and a light-collection efficiency of 5.9% has been designed.
在100 kj级激光设备上,氘-氚中子产率达到1013左右,这使得中子成像系统可以测量中子发射图像。从闪烁体阵列、光纤锥和透镜系统采集中子图像有两种方法。本文报道了一种用于100kj级激光装置中子成像系统的透镜系统的设计。设计了一个空间分辨率为20µm、集光效率为5.9%的九元聚光透镜系统。
{"title":"Design of the scintillator imaging lens for the neutron imaging system at the 100 kJ-level laser facility.","authors":"Qiukai Li, Zhongjing Chen, T. Xu, Yadong Yan, Feng Wang, Junhua He","doi":"10.1063/5.0086782","DOIUrl":"https://doi.org/10.1063/5.0086782","url":null,"abstract":"Deuterium-tritium neutron yield has reached up to about 1013 at the 100 kJ-level laser facility, which makes measurement of neutron emission images possible with the neutron imaging system. There are two methods to collect neutron images from the scintillator array, optical fiber taper and the lens system. Here, we report a design of the lens system for the neutron imaging system at the 100 kJ-level laser facility. The lens system, which consists of a nine-element collecting lens, with a spatial resolution of 20 µm and a light-collection efficiency of 5.9% has been designed.","PeriodicalId":54761,"journal":{"name":"Journal of the Optical Society of America and Review of Scientific Instruments","volume":"36 1","pages":"043303"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74805989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Probe-based microscale measurement setup for the thermal diffusivity of soft materials. 基于探针的软质材料热扩散系数微尺度测量装置。
M. Ryu, M. Akoshima, J. Morikawa
Based on the principle of the periodic heating method by using cantilever thermocouple nanoprobes, we developed a method and an apparatus to measure the thermal diffusivity of soft materials on a microscale. The contact position of the probe tip with the sample surface was defined by using the phenomenon that the DC component of the thermal electromotive force (EMF) of the probe changes significantly upon contact (i.e., the vertical temperature gradient near the sample surface changes significantly). This contact position was set as the surface reference position where the variation of the thermal contact conductance between the sample surface and the sensor probe is minimized. The phase shift from the micro-heater was measured by the AC component of the probe's thermal EMF and used to accurately determine the thermal diffusivity of micro-sized soft materials. The thermal diffusivity of the microstructured photoresist was determined with a deviation of ±3%.
基于悬臂式热电偶纳米探针周期性加热的原理,研制了一种在微尺度上测量软质材料热扩散系数的方法和装置。利用探针的热电动势(EMF)的直流分量在接触时发生显著变化(即样品表面附近的垂直温度梯度发生显著变化)的现象来定义探针尖端与样品表面的接触位置。将该接触位置设置为样品表面与传感器探头之间的热接触电导变化最小的表面参考位置。微加热器的相移由探针的热电动势的交流分量测量,并用于精确确定微尺寸软材料的热扩散系数。微结构光刻胶的热扩散系数测定偏差为±3%。
{"title":"Probe-based microscale measurement setup for the thermal diffusivity of soft materials.","authors":"M. Ryu, M. Akoshima, J. Morikawa","doi":"10.1063/5.0084891","DOIUrl":"https://doi.org/10.1063/5.0084891","url":null,"abstract":"Based on the principle of the periodic heating method by using cantilever thermocouple nanoprobes, we developed a method and an apparatus to measure the thermal diffusivity of soft materials on a microscale. The contact position of the probe tip with the sample surface was defined by using the phenomenon that the DC component of the thermal electromotive force (EMF) of the probe changes significantly upon contact (i.e., the vertical temperature gradient near the sample surface changes significantly). This contact position was set as the surface reference position where the variation of the thermal contact conductance between the sample surface and the sensor probe is minimized. The phase shift from the micro-heater was measured by the AC component of the probe's thermal EMF and used to accurately determine the thermal diffusivity of micro-sized soft materials. The thermal diffusivity of the microstructured photoresist was determined with a deviation of ±3%.","PeriodicalId":54761,"journal":{"name":"Journal of the Optical Society of America and Review of Scientific Instruments","volume":"152 1","pages":"044901"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76260851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Suppression of ambient temperature-caused drift in a laser power stabilization system with a liquid crystal variable retarder in atomic gyroscopes. 液晶可变缓速器在原子陀螺仪激光功率稳定系统中对环境温度漂移的抑制。
Yue Niu, Lihong Duan, Jingxin Zhang, Jiong Huang, Yueyang Zhai, W. Quan
Laser power stabilization systems with liquid crystal variable retarders have been employed in miniaturized atomic gyroscopes for the merits of low power consumption and easy integration. However, the long-term power drift of the system output with ambient temperature significantly decreases the long-term performance of atomic gyroscopes. Here, we demonstrated a method of dynamic closed-loop control based on the combination of optical power drift and ambient temperature modeling. For a continuous 45 min operation within an ambient temperature variation range of 23.7-25.3 °C, the relative Allan deviation of the output optical power was decreased by one order of magnitude from 2.29 × 10-4 to 3.35 × 10-5 after 100 s averaging time. The long-term stability of the system was significantly improved. In addition, the scheme requires no additional thermal control device, preventing the introduction of extra electromagnetic interference, which is desirable in a miniaturized atomic gyroscope.
液晶可变缓速器激光功率稳定系统具有低功耗、易于集成等优点,已广泛应用于小型化原子陀螺仪中。然而,系统输出功率随环境温度的长期漂移会显著降低原子陀螺仪的长期性能。在这里,我们展示了一种基于光功率漂移和环境温度建模相结合的动态闭环控制方法。在23.7 ~ 25.3℃的环境温度变化范围内连续工作45 min,平均100 s后,输出光功率的相对艾伦偏差从2.29 × 10-4减小到3.35 × 10-5,减小了一个数量级。系统的长期稳定性显著提高。此外,该方案不需要额外的热控制装置,防止引入额外的电磁干扰,这是小型化原子陀螺仪所需要的。
{"title":"Suppression of ambient temperature-caused drift in a laser power stabilization system with a liquid crystal variable retarder in atomic gyroscopes.","authors":"Yue Niu, Lihong Duan, Jingxin Zhang, Jiong Huang, Yueyang Zhai, W. Quan","doi":"10.1063/5.0049994","DOIUrl":"https://doi.org/10.1063/5.0049994","url":null,"abstract":"Laser power stabilization systems with liquid crystal variable retarders have been employed in miniaturized atomic gyroscopes for the merits of low power consumption and easy integration. However, the long-term power drift of the system output with ambient temperature significantly decreases the long-term performance of atomic gyroscopes. Here, we demonstrated a method of dynamic closed-loop control based on the combination of optical power drift and ambient temperature modeling. For a continuous 45 min operation within an ambient temperature variation range of 23.7-25.3 °C, the relative Allan deviation of the output optical power was decreased by one order of magnitude from 2.29 × 10-4 to 3.35 × 10-5 after 100 s averaging time. The long-term stability of the system was significantly improved. In addition, the scheme requires no additional thermal control device, preventing the introduction of extra electromagnetic interference, which is desirable in a miniaturized atomic gyroscope.","PeriodicalId":54761,"journal":{"name":"Journal of the Optical Society of America and Review of Scientific Instruments","volume":"36 1","pages":"043002"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76164632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Open magnetic shielding for static and alternating field. 静、交变磁场开式磁屏蔽。
C. Gu, L. Lai, K. Zhao, N. J. Ren
To meet the increasing and various demands for low magnetic field measurement, an open magnetic shielding system created using a combination of copper coils and precisely designed superconducting closed coils is proposed. After testing, the prototype system showed a shielding factor of more than 10 000 in the direct current field and most importantly, a shielding factor of at least 100 in the alternating field from frequencies of 0.01-100 Hz in a 5 cm spherical volume. We interestingly found that the magnetic purity of the open system is capable of catching up with the magnetically shielded room with moderate performance. The structure and principle of the system are introduced in this paper. A key factor that makes the system possible is the decoupled interaction between the copper coils and superconducting coils. The limitations of this system and ways to improve its performance are discussed. This novel approach provides a more sophisticated and flexible way to achieve open magnetic shielding.
为了满足日益增长和多样化的低磁场测量需求,提出了一种采用铜线圈和精密设计的超导闭合线圈相结合的开放式磁屏蔽系统。经过测试,该样机系统在直流磁场中的屏蔽系数超过10000,最重要的是,在5厘米球形体积内,在0.01-100 Hz频率范围内的交变磁场中屏蔽系数至少达到100。有趣的是,我们发现开放系统的磁纯度能够赶上性能适中的磁屏蔽室。本文介绍了该系统的结构和工作原理。使该系统成为可能的一个关键因素是铜线圈和超导线圈之间的去耦相互作用。讨论了该系统的局限性和提高其性能的途径。这种新颖的方法提供了一种更加复杂和灵活的方法来实现开放式磁屏蔽。
{"title":"Open magnetic shielding for static and alternating field.","authors":"C. Gu, L. Lai, K. Zhao, N. J. Ren","doi":"10.1063/5.0083306","DOIUrl":"https://doi.org/10.1063/5.0083306","url":null,"abstract":"To meet the increasing and various demands for low magnetic field measurement, an open magnetic shielding system created using a combination of copper coils and precisely designed superconducting closed coils is proposed. After testing, the prototype system showed a shielding factor of more than 10 000 in the direct current field and most importantly, a shielding factor of at least 100 in the alternating field from frequencies of 0.01-100 Hz in a 5 cm spherical volume. We interestingly found that the magnetic purity of the open system is capable of catching up with the magnetically shielded room with moderate performance. The structure and principle of the system are introduced in this paper. A key factor that makes the system possible is the decoupled interaction between the copper coils and superconducting coils. The limitations of this system and ways to improve its performance are discussed. This novel approach provides a more sophisticated and flexible way to achieve open magnetic shielding.","PeriodicalId":54761,"journal":{"name":"Journal of the Optical Society of America and Review of Scientific Instruments","volume":"67 1","pages":"045103"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73796515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quasi-isentropic compression of LiH above 400 GPa using magnetocumulative generator. 利用磁累积发生器对400 GPa以上的LiH进行准等熵压缩。
X. Zhang, Z. Gu, Z. Xiao, F. Tan, X. Ye, Y. Tong, X. S. Tang, Z. Zhou, C. Cheng, J. Zhao, B. Luo, J. Li, X. Kuang, J. Zhao, C. W. Sun, C. L. Liu
The knowledge of high-pressure behavior of LiH is significant for the validation of fundamental theoretical models and applications in thermonuclear materials and potential energy supplies. The compressibility of 7LiH under isentropic compression at high pressure was investigated experimentally and theoretically. The experimental technique for quasi-isentropic compression with low-density materials was developed using the magnetocumulative generator CJ-100 and x-ray flash radiography. The x-ray images and extracted interface of the sample target in dynamic flash radiography experiments were obtained. According to each interface size of the target both before and after compression, the compression ratio of 7LiH and reference material aluminum was obtained. The density of the reference and using its known isentropic curve provide the pressure in the reference. The pressure in 7LiH was deduced from the pressure in the reference and using the calculated gradient correction factor. The quasi-isentropic data point at 438 GPa was obtained experimentally. A semiempirical three-term complete equation of state was constructed and validated for 7LiH using the theory of Mie-Grüneisen-Debye with experimental data from the literature. The quasi-isentrope data point is reasonably consistent with the theoretical results. The quasi-isentropic experimental techniques and results broaden the existing research scope and are practical and helpful to further validate theoretical models in the future.
锂离子高压行为的认识对于验证基本理论模型以及在热核材料和势能供应中的应用具有重要意义。对7LiH在高压等熵压缩下的可压缩性进行了实验和理论研究。利用j -100型磁累积发生器和x射线闪光照相技术,建立了低密度材料准等熵压缩实验技术。获得了动态闪光照相实验中样品目标的x射线图像和提取界面。根据压缩前后靶材的各个界面尺寸,得到7LiH与基准材料铝的压缩比。参考物的密度和利用其已知的等熵曲线提供参考物中的压力。7LiH内的压力由参考压力和计算的梯度校正系数推导而来。实验得到了438 GPa的准等熵数据点。利用mie - gren - neisen- debye理论,结合文献中的实验数据,构造了7LiH的半经验三项完全状态方程,并对其进行了验证。拟等熵数据点与理论结果基本一致。准等熵实验技术和结果拓宽了现有的研究范围,对进一步验证理论模型具有实用价值。
{"title":"Quasi-isentropic compression of LiH above 400 GPa using magnetocumulative generator.","authors":"X. Zhang, Z. Gu, Z. Xiao, F. Tan, X. Ye, Y. Tong, X. S. Tang, Z. Zhou, C. Cheng, J. Zhao, B. Luo, J. Li, X. Kuang, J. Zhao, C. W. Sun, C. L. Liu","doi":"10.1063/5.0078422","DOIUrl":"https://doi.org/10.1063/5.0078422","url":null,"abstract":"The knowledge of high-pressure behavior of LiH is significant for the validation of fundamental theoretical models and applications in thermonuclear materials and potential energy supplies. The compressibility of 7LiH under isentropic compression at high pressure was investigated experimentally and theoretically. The experimental technique for quasi-isentropic compression with low-density materials was developed using the magnetocumulative generator CJ-100 and x-ray flash radiography. The x-ray images and extracted interface of the sample target in dynamic flash radiography experiments were obtained. According to each interface size of the target both before and after compression, the compression ratio of 7LiH and reference material aluminum was obtained. The density of the reference and using its known isentropic curve provide the pressure in the reference. The pressure in 7LiH was deduced from the pressure in the reference and using the calculated gradient correction factor. The quasi-isentropic data point at 438 GPa was obtained experimentally. A semiempirical three-term complete equation of state was constructed and validated for 7LiH using the theory of Mie-Grüneisen-Debye with experimental data from the literature. The quasi-isentrope data point is reasonably consistent with the theoretical results. The quasi-isentropic experimental techniques and results broaden the existing research scope and are practical and helpful to further validate theoretical models in the future.","PeriodicalId":54761,"journal":{"name":"Journal of the Optical Society of America and Review of Scientific Instruments","volume":"46 1","pages":"043906"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80015825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An instrument for in situ characterization of powder spreading dynamics in powder-bed-based additive manufacturing processes. 基于粉末床的增材制造过程中粉末扩散动力学的原位表征仪器。
Luis I. Escano, N. Parab, Qilin Guo, Minglei Qu, K. Fezzaa, W. Everhart, T. Sun, Lianyi Chen
In powder-bed-based metal additive manufacturing (AM), the visualization and analysis of the powder spreading process are critical for understanding the powder spreading dynamics and mechanisms. Unfortunately, the high spreading speeds, the small size of the powder, and the opacity of the materials present a great challenge for directly observing the powder spreading behavior. Here, we report a compact and flexible powder spreading system for in situ characterization of the dynamics of the powders during the spreading process by high-speed x-ray imaging. The system enables the tracing of individual powder movement within the narrow gap between the recoater and the substrate at variable spreading speeds from 17 to 322 mm/s. The instrument and method reported here provide a powerful tool for studying powder spreading physics in AM processes and for investigating the physics of granular material flow behavior in a confined environment.
在基于粉末床的金属增材制造中,粉末扩散过程的可视化和分析对于理解粉末扩散动力学和机理至关重要。然而,由于粉末的扩散速度快、粒径小以及材料的不透明性,给直接观察粉末的扩散行为带来了很大的挑战。在这里,我们报告了一个紧凑和灵活的粉末扩散系统,用于在高速x射线成像中对粉末在扩散过程中的动态进行原位表征。该系统能够以17至322毫米/秒的可变扩散速度在重涂器和基材之间的狭窄间隙内跟踪单个粉末的运动。本文报道的仪器和方法为研究增材制造过程中的粉末扩散物理以及研究受限环境中颗粒材料流动行为的物理特性提供了有力的工具。
{"title":"An instrument for in situ characterization of powder spreading dynamics in powder-bed-based additive manufacturing processes.","authors":"Luis I. Escano, N. Parab, Qilin Guo, Minglei Qu, K. Fezzaa, W. Everhart, T. Sun, Lianyi Chen","doi":"10.1063/5.0076235","DOIUrl":"https://doi.org/10.1063/5.0076235","url":null,"abstract":"In powder-bed-based metal additive manufacturing (AM), the visualization and analysis of the powder spreading process are critical for understanding the powder spreading dynamics and mechanisms. Unfortunately, the high spreading speeds, the small size of the powder, and the opacity of the materials present a great challenge for directly observing the powder spreading behavior. Here, we report a compact and flexible powder spreading system for in situ characterization of the dynamics of the powders during the spreading process by high-speed x-ray imaging. The system enables the tracing of individual powder movement within the narrow gap between the recoater and the substrate at variable spreading speeds from 17 to 322 mm/s. The instrument and method reported here provide a powerful tool for studying powder spreading physics in AM processes and for investigating the physics of granular material flow behavior in a confined environment.","PeriodicalId":54761,"journal":{"name":"Journal of the Optical Society of America and Review of Scientific Instruments","volume":"21 1","pages":"043707"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82653229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
A battery-powered over-voltage triggering method for two-electrode spark gaps in Marx generator. 一种马克思发电机两极火花间隙的电池供电过电压触发方法。
Xuedi Liu, Huibo Zhang, Zicheng Zhang, Shifei Liu, Haoran Zhang
Triggered gas switches with trigger electrodes, such as three-electrode spark switches and trigatron type spark switches, have been widely used in repetitive operating Marx generators due to their large current flowing capability. However, the ablation of trigger electrodes during repetitive operation is inevitable, which reduces the working life of triggered gas switches. In this paper, we introduced an over-voltage triggering method for two-electrode spark switches by replacing one of the charging inductors of the Marx generator with a pulse generator. The experimental results showed that a high-voltage trigger pulse with an amplitude of 60 kV and a rising speed of 7.65 kV/100 ns was obtained from a single stackable module with a 12 V lithium battery pack as the energy source. Due to the absence of trigger electrodes, the triggering method is beneficial to extend the lifetime of switches and realize a maintenance-free repetitive operating Marx generator.
具有触发电极的触发气体开关,如三电极火花开关和三管式火花开关,由于具有较大的电流流动能力,在重复运行的马克思发电机中得到了广泛的应用。然而,在重复操作过程中触发电极的烧蚀是不可避免的,这降低了触发气体开关的工作寿命。本文介绍了一种用脉冲发生器代替马克思发电机的一个充电电感,实现双电极火花开关过电压触发的方法。实验结果表明,以12 V锂电池组为能量源,在单个可堆叠模块中获得了幅值为60 kV、上升速度为7.65 kV/100 ns的高压触发脉冲。由于没有触发电极,这种触发方式有利于延长开关的使用寿命,实现马克思发电机的免维护重复运行。
{"title":"A battery-powered over-voltage triggering method for two-electrode spark gaps in Marx generator.","authors":"Xuedi Liu, Huibo Zhang, Zicheng Zhang, Shifei Liu, Haoran Zhang","doi":"10.1063/5.0070566","DOIUrl":"https://doi.org/10.1063/5.0070566","url":null,"abstract":"Triggered gas switches with trigger electrodes, such as three-electrode spark switches and trigatron type spark switches, have been widely used in repetitive operating Marx generators due to their large current flowing capability. However, the ablation of trigger electrodes during repetitive operation is inevitable, which reduces the working life of triggered gas switches. In this paper, we introduced an over-voltage triggering method for two-electrode spark switches by replacing one of the charging inductors of the Marx generator with a pulse generator. The experimental results showed that a high-voltage trigger pulse with an amplitude of 60 kV and a rising speed of 7.65 kV/100 ns was obtained from a single stackable module with a 12 V lithium battery pack as the energy source. Due to the absence of trigger electrodes, the triggering method is beneficial to extend the lifetime of switches and realize a maintenance-free repetitive operating Marx generator.","PeriodicalId":54761,"journal":{"name":"Journal of the Optical Society of America and Review of Scientific Instruments","volume":"37 1","pages":"044706"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89399034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of magnetic field on the seismometer in vibration correction for atom gravimeters. 原子重力仪振动校正中磁场对地震仪的影响。
Kun Qi, Yao-Yao Xu, Xiao-Bing Deng, Lele Chen, Qin Luo, Minkang Zhou, Xiao-chun Duan, Zhongkun Hu
Vibration correction provides a simple and flexible method of suppressing ambient vibration noise in transportable atom gravimeters. However, in the seismometers used for vibration correction, a spurious output may be induced by the magnetic field of the magnetic-optical trap, introducing errors to the gravity measurements. This paper evaluates the influence of the magnetic field on the seismometer and the corresponding errors in the gravity measurements. It is found that an error level of order 10 μGal may be present if the seismometer is not configured carefully. The dependence of the influence on the orientation of the seismometer and the lasting time of the magnetic field are investigated. The effective suppression of the influence by shielding the seismometer is also demonstrated. Our results focus attention on the possible errors related to seismometers in high-precision gravity measurements by using atom gravimeters.
振动校正为可移动原子重力仪提供了一种简单灵活的抑制环境振动噪声的方法。然而,在用于振动校正的地震仪中,磁光阱的磁场可能会引起伪输出,从而给重力测量带来误差。本文评价了磁场对地震仪的影响及其在重力测量中的误差。结果表明,如果地震仪配置不当,可能产生10 μGal量级的误差。研究了磁场影响与地震仪方位和磁场持续时间的关系。通过屏蔽地震仪,可以有效地抑制地震的影响。本文的研究结果关注了原子重力仪高精度重力测量中地震检波器可能存在的误差。
{"title":"Influence of magnetic field on the seismometer in vibration correction for atom gravimeters.","authors":"Kun Qi, Yao-Yao Xu, Xiao-Bing Deng, Lele Chen, Qin Luo, Minkang Zhou, Xiao-chun Duan, Zhongkun Hu","doi":"10.1063/5.0081148","DOIUrl":"https://doi.org/10.1063/5.0081148","url":null,"abstract":"Vibration correction provides a simple and flexible method of suppressing ambient vibration noise in transportable atom gravimeters. However, in the seismometers used for vibration correction, a spurious output may be induced by the magnetic field of the magnetic-optical trap, introducing errors to the gravity measurements. This paper evaluates the influence of the magnetic field on the seismometer and the corresponding errors in the gravity measurements. It is found that an error level of order 10 μGal may be present if the seismometer is not configured carefully. The dependence of the influence on the orientation of the seismometer and the lasting time of the magnetic field are investigated. The effective suppression of the influence by shielding the seismometer is also demonstrated. Our results focus attention on the possible errors related to seismometers in high-precision gravity measurements by using atom gravimeters.","PeriodicalId":54761,"journal":{"name":"Journal of the Optical Society of America and Review of Scientific Instruments","volume":"39 1","pages":"044503"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76664359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Anomaly detection of complex magnetic measurements using structured Hankel low-rank modeling and singular value decomposition. 基于结构化Hankel低秩建模和奇异值分解的复杂磁测量异常检测。
Xinglin Zhang, Huan Liu, Zehua Wang, H. Dong, J. Ge, Zheng Liu
The magnetic anomalies generated by the ferromagnetic targets are usually buried within uncontrollable interference sources, such as the power frequency and random noises. In particular, the variability of the geomagnetic field and the low signal-to-noise ratio (SNR) of the magnetic anomalies cannot be avoided. In this paper, to improve the performance of magnetic anomaly detection (MAD) with a low SNR, we propose a novel structured low-rank (SLR) decomposition-based MAD method. In addition, a new framework based on the SLR and singular value decomposition (SVD) is constructed, dubbed SLR-SVD, and the corresponding working principle and implemented strategy are elaborated. Through comparing the SLR-SVD with two state-of-the-art methods, including principal component analysis and SVD, the results demonstrate that the proposed SLR-SVD can not only suppress the noise sufficiently, i.e., improving 55.26% approximately of the SNR, but also retain more boundary information of magnetic anomalies, i.e., decreasing approximately 68.05% of the mean squared error and improving approximately 28.47% of the structural similarity index.
铁磁目标产生的磁异常通常隐藏在工频和随机噪声等不可控干扰源中。特别是地磁场的多变性和磁异常的低信噪比是无法避免的。为了提高低信噪比磁异常检测的性能,提出了一种基于结构低秩分解的磁异常检测方法。在此基础上,构建了基于SLR和奇异值分解(SVD)的新框架,称为SLR-SVD,并阐述了相应的工作原理和实现策略。通过将SLR-SVD与主成分分析和奇异值分解两种最先进的方法进行比较,结果表明,SLR-SVD不仅能充分抑制噪声,提高信噪比约55.26%,而且能保留更多的磁异常边界信息,使均方误差降低约68.05%,结构相似度指数提高约28.47%。
{"title":"Anomaly detection of complex magnetic measurements using structured Hankel low-rank modeling and singular value decomposition.","authors":"Xinglin Zhang, Huan Liu, Zehua Wang, H. Dong, J. Ge, Zheng Liu","doi":"10.1063/5.0088254","DOIUrl":"https://doi.org/10.1063/5.0088254","url":null,"abstract":"The magnetic anomalies generated by the ferromagnetic targets are usually buried within uncontrollable interference sources, such as the power frequency and random noises. In particular, the variability of the geomagnetic field and the low signal-to-noise ratio (SNR) of the magnetic anomalies cannot be avoided. In this paper, to improve the performance of magnetic anomaly detection (MAD) with a low SNR, we propose a novel structured low-rank (SLR) decomposition-based MAD method. In addition, a new framework based on the SLR and singular value decomposition (SVD) is constructed, dubbed SLR-SVD, and the corresponding working principle and implemented strategy are elaborated. Through comparing the SLR-SVD with two state-of-the-art methods, including principal component analysis and SVD, the results demonstrate that the proposed SLR-SVD can not only suppress the noise sufficiently, i.e., improving 55.26% approximately of the SNR, but also retain more boundary information of magnetic anomalies, i.e., decreasing approximately 68.05% of the mean squared error and improving approximately 28.47% of the structural similarity index.","PeriodicalId":54761,"journal":{"name":"Journal of the Optical Society of America and Review of Scientific Instruments","volume":"93 4 1","pages":"045107"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75100973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Tracking moving target for 6 degree-of-freedom robot manipulator with adaptive visual servoing based on deep reinforcement learning PID controller. 基于深度强化学习PID控制器的自适应视觉伺服六自由度机械臂运动目标跟踪。
Fei Wang, Baiming Ren, Yue Liu, Ben Cui
In this paper, an image-based visual servoing (IBVS) controller with a 6 degree-of-freedom robotic manipulator that tracks moving objects is investigated using the proposed Deep Q-Networks and proportional-integral-derivative (DQN-PID) controller. First, the classical IBVS controller and the problem of feature loss and large steady-state error for tracking moving targets are introduced. Then, a DQN-PID based IBVS method is proposed to solve the problem of feature loss and large steady-state error and improve the servo precision, as the existing methods are hard to use for solve the problems. Specifically, the IBVS method is inherited by our controller to build the tracking model, and a value-based reinforcement learning method is proposed as an adaptive law for dynamically tuning the PID parameters in the discrete space, which can track the moving target and keep the servo feature in the field of the camera. Finally, compared with the different existing methods, the DQN-PID based IBVS method has merits of higher accuracy and more stable tracking, or generalization.
本文利用所提出的深度q -网络和比例-积分-导数(DQN-PID)控制器,研究了一种具有6自由度运动目标跟踪机器人的基于图像的视觉伺服(IBVS)控制器。首先,介绍了经典IBVS控制器及其在运动目标跟踪中存在的特征损失和稳态误差大的问题。然后,提出了一种基于DQN-PID的IBVS方法,解决了现有方法难以解决的特征损失和稳态误差大的问题,提高了伺服精度。具体来说,我们的控制器继承IBVS方法建立跟踪模型,并提出了一种基于值的强化学习方法作为自适应律在离散空间中动态整定PID参数,既能跟踪运动目标,又能保持摄像机视场内的伺服特征。最后,与现有的各种方法相比,基于DQN-PID的IBVS方法具有更高的精度和更稳定的跟踪或泛化的优点。
{"title":"Tracking moving target for 6 degree-of-freedom robot manipulator with adaptive visual servoing based on deep reinforcement learning PID controller.","authors":"Fei Wang, Baiming Ren, Yue Liu, Ben Cui","doi":"10.1063/5.0087561","DOIUrl":"https://doi.org/10.1063/5.0087561","url":null,"abstract":"In this paper, an image-based visual servoing (IBVS) controller with a 6 degree-of-freedom robotic manipulator that tracks moving objects is investigated using the proposed Deep Q-Networks and proportional-integral-derivative (DQN-PID) controller. First, the classical IBVS controller and the problem of feature loss and large steady-state error for tracking moving targets are introduced. Then, a DQN-PID based IBVS method is proposed to solve the problem of feature loss and large steady-state error and improve the servo precision, as the existing methods are hard to use for solve the problems. Specifically, the IBVS method is inherited by our controller to build the tracking model, and a value-based reinforcement learning method is proposed as an adaptive law for dynamically tuning the PID parameters in the discrete space, which can track the moving target and keep the servo feature in the field of the camera. Finally, compared with the different existing methods, the DQN-PID based IBVS method has merits of higher accuracy and more stable tracking, or generalization.","PeriodicalId":54761,"journal":{"name":"Journal of the Optical Society of America and Review of Scientific Instruments","volume":"29 1","pages":"045108"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74633433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
期刊
Journal of the Optical Society of America and Review of Scientific Instruments
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1