首页 > 最新文献

2018 IEEE International Frequency Control Symposium (IFCS)最新文献

英文 中文
A Compact Design of a Transportable Calcium Optical Frequency Standard 可移动钙光频标的紧凑设计
Pub Date : 2018-05-01 DOI: 10.1109/fcs.2018.8597454
Xiaobo Xue, Zhenwei Zhang, Xu Zhang, Huan Zhao, Nuan-rang Wang, Xing Chen, Li Zhang, Ren-fu Yang, Deng Liu
Since the instability and uncertainty of optical frequency standards have achieved the level of 10−18, and since the locking time of these frequency standards has become much longer, it is appropriate and necessary to build more practical optical frequency standards. Here we propose a compact design of a transportable Calcium optical frequency standard with the purpose of realizing a long time running optical clock. The design consists of an electronic cabinet and an optical cabinet. The total volume designed is 1.2 m3, with the electronic cabinet 0.8 m3and the optical cabinet 0.4 m3. It is designed to achieve a short term instability of $5times 10^{-14} tau^{-1/2}$ (1–1000s) and a mean time between failures (MTBF) of 8 hours. It may have the potential to be used as an optical timekeeping clock with the long term instability and MTBF optimized.
由于光频率标准的不稳定性和不确定度已经达到10−18的水平,并且这些频率标准的锁定时间已经变得更长,因此建立更实用的光频率标准是适当的和必要的。为了实现长时间运行的光时钟,我们提出了一种紧凑的可移动钙光频标设计。本设计由一个电子柜和一个光学柜组成。设计总容积为1.2 m3,其中电子柜0.8 m3,光柜0.4 m3。它的短期不稳定性为$5 × 10^{-14} tau^{-1/2}$ (1-1000s),平均故障间隔时间(MTBF)为8小时。它具有长期不稳定性和MTBF优化的光学计时钟的潜力。
{"title":"A Compact Design of a Transportable Calcium Optical Frequency Standard","authors":"Xiaobo Xue, Zhenwei Zhang, Xu Zhang, Huan Zhao, Nuan-rang Wang, Xing Chen, Li Zhang, Ren-fu Yang, Deng Liu","doi":"10.1109/fcs.2018.8597454","DOIUrl":"https://doi.org/10.1109/fcs.2018.8597454","url":null,"abstract":"Since the instability and uncertainty of optical frequency standards have achieved the level of 10−18, and since the locking time of these frequency standards has become much longer, it is appropriate and necessary to build more practical optical frequency standards. Here we propose a compact design of a transportable Calcium optical frequency standard with the purpose of realizing a long time running optical clock. The design consists of an electronic cabinet and an optical cabinet. The total volume designed is 1.2 m3, with the electronic cabinet 0.8 m3and the optical cabinet 0.4 m3. It is designed to achieve a short term instability of $5times 10^{-14} tau^{-1/2}$ (1–1000s) and a mean time between failures (MTBF) of 8 hours. It may have the potential to be used as an optical timekeeping clock with the long term instability and MTBF optimized.","PeriodicalId":180164,"journal":{"name":"2018 IEEE International Frequency Control Symposium (IFCS)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121924845","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
Direct Selection and Amplification of an Optical Frequency Comb via Injection Locking for Second Cooling Laser of Strontium Optical Clock 锶光钟二次冷却激光注入锁紧直接选择和放大光频梳
Pub Date : 2018-05-01 DOI: 10.1109/FCS.2018.8597540
Qinfang Xu, Mojuan Yin, Shan-he Wang, J. Ju, Dehuan Kong, Yebing Wang, B. Lu, Hong Chang
The work presented in this paper is based on an optical frequency comb injection-locking, active filtering and amplification method to build a narrow linewidth laser for second cooling of the strontium atoms in an optical lattice clock. An optical femtosecond laser comb with mode spacing of 250 MHz as master laser is applied to directly inject into an external cavity semiconductor laser at 689 nm called slave laser, a single mode is selected and amplified from the optical femtosecond laser comb.
本文的工作是基于一种光学频率梳注入锁定、有源滤波和放大方法来构建用于光学晶格时钟中锶原子二次冷却的窄线宽激光器。采用模距为250 MHz的光学飞秒激光梳作为主激光,直接注入到689 nm的外腔半导体激光器中,即从激光器,从飞秒激光梳中选择并放大单模。
{"title":"Direct Selection and Amplification of an Optical Frequency Comb via Injection Locking for Second Cooling Laser of Strontium Optical Clock","authors":"Qinfang Xu, Mojuan Yin, Shan-he Wang, J. Ju, Dehuan Kong, Yebing Wang, B. Lu, Hong Chang","doi":"10.1109/FCS.2018.8597540","DOIUrl":"https://doi.org/10.1109/FCS.2018.8597540","url":null,"abstract":"The work presented in this paper is based on an optical frequency comb injection-locking, active filtering and amplification method to build a narrow linewidth laser for second cooling of the strontium atoms in an optical lattice clock. An optical femtosecond laser comb with mode spacing of 250 MHz as master laser is applied to directly inject into an external cavity semiconductor laser at 689 nm called slave laser, a single mode is selected and amplified from the optical femtosecond laser comb.","PeriodicalId":180164,"journal":{"name":"2018 IEEE International Frequency Control Symposium (IFCS)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123340298","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
Highly Stable and Low Phase Noise 10 GHz RF Signal Generation Based on a Sub-Harmonic Injection Locked Optoelectronic Oscillator 基于次谐波注入锁相光电振荡器的高稳定低相位噪声10ghz射频信号生成
Pub Date : 2018-05-01 DOI: 10.1109/FCS.2018.8597445
H. Peng, H. Du, Rui Guo, Yongchi Xu, Cheng Zhang, Jingbiao Chen, Zhangyuan Chen
A low phase noise and highly stable 10 GHz RF signal generation system based on a sub-harmonic injection locked optoelectronic oscillator (OEO) is proposed and experimentally demonstrated. By externally injecting a sub-harmonic of the 10 GHz free-running OEO to the OEO loop, the phase noise at 10 Hz offset of the 10 GHz oscillation RF signal is reduced by 40 dB when compared with the free-running OEO. The influence of the power of the injection RF signal on the phase noise performance of the injection locked OEO is also experimentally investigated.
提出了一种基于亚谐波注入锁定光电振荡器(OEO)的低相位噪声、高稳定的10ghz射频信号产生系统,并进行了实验验证。通过向OEO环路注入10ghz自由运行OEO的子谐波,与自由运行OEO相比,10ghz振荡射频信号在10hz偏移处的相位噪声降低了40 dB。实验还研究了注入射频信号功率对注入锁定OEO相位噪声性能的影响。
{"title":"Highly Stable and Low Phase Noise 10 GHz RF Signal Generation Based on a Sub-Harmonic Injection Locked Optoelectronic Oscillator","authors":"H. Peng, H. Du, Rui Guo, Yongchi Xu, Cheng Zhang, Jingbiao Chen, Zhangyuan Chen","doi":"10.1109/FCS.2018.8597445","DOIUrl":"https://doi.org/10.1109/FCS.2018.8597445","url":null,"abstract":"A low phase noise and highly stable 10 GHz RF signal generation system based on a sub-harmonic injection locked optoelectronic oscillator (OEO) is proposed and experimentally demonstrated. By externally injecting a sub-harmonic of the 10 GHz free-running OEO to the OEO loop, the phase noise at 10 Hz offset of the 10 GHz oscillation RF signal is reduced by 40 dB when compared with the free-running OEO. The influence of the power of the injection RF signal on the phase noise performance of the injection locked OEO is also experimentally investigated.","PeriodicalId":180164,"journal":{"name":"2018 IEEE International Frequency Control Symposium (IFCS)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115841407","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: 3
Microwave Frequency Generation Using a Non-Octave-Spanning Optical Frequency Comb 使用非八度跨越光学频率梳产生微波频率
Pub Date : 2018-05-01 DOI: 10.1109/FCS.2018.8597459
J. Cahill, Weimin Zhou, C. Menyuk
Self-frequency stabilization of the repetition rate of an optical frequency comb using a short-path-length interferometer can be used to generate ultra-low phase noise microwaves. Moreover, this technique is compatible is photonic integration, indicating a pathway towards a chip-scale low-phase-noise microwave frequency source. Separately, difference-frequency stabilization allows ultra-low phase noise microwave generation without carrier-envelope phase locking. In this work, we evaluate the challenges in implementing a difference-frequency stabilization scheme with a short-path-length-interferometer. We find that the combination of a short-path-length and lower frequency multiplication factor will exacerbate electronic noise contributions, influence the ability of the feedback loop to achieve lock. We also find that dispersion management is essential to generating usable error signals for single-mode fiber delay lines that are longer than approximately 4 m.
利用短路长度干涉仪实现光频梳重复频率的自稳频可以产生超低相位噪声微波。此外,该技术与光子集成兼容,为芯片级低相位噪声微波频率源指明了一条道路。另外,差频稳定允许超低相位噪声微波产生而不需要载波包络锁相。在这项工作中,我们评估了使用短路径长度干涉仪实现差频稳定方案的挑战。我们发现,较短的路径长度和较低的倍频因子的组合将加剧电子噪声的贡献,影响反馈环路实现锁定的能力。我们还发现,对于长度超过约4米的单模光纤延迟线,色散管理对于产生可用的误差信号至关重要。
{"title":"Microwave Frequency Generation Using a Non-Octave-Spanning Optical Frequency Comb","authors":"J. Cahill, Weimin Zhou, C. Menyuk","doi":"10.1109/FCS.2018.8597459","DOIUrl":"https://doi.org/10.1109/FCS.2018.8597459","url":null,"abstract":"Self-frequency stabilization of the repetition rate of an optical frequency comb using a short-path-length interferometer can be used to generate ultra-low phase noise microwaves. Moreover, this technique is compatible is photonic integration, indicating a pathway towards a chip-scale low-phase-noise microwave frequency source. Separately, difference-frequency stabilization allows ultra-low phase noise microwave generation without carrier-envelope phase locking. In this work, we evaluate the challenges in implementing a difference-frequency stabilization scheme with a short-path-length-interferometer. We find that the combination of a short-path-length and lower frequency multiplication factor will exacerbate electronic noise contributions, influence the ability of the feedback loop to achieve lock. We also find that dispersion management is essential to generating usable error signals for single-mode fiber delay lines that are longer than approximately 4 m.","PeriodicalId":180164,"journal":{"name":"2018 IEEE International Frequency Control Symposium (IFCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131900580","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
Route to a Portable Optical Clock 到便携式光时钟的路由
Pub Date : 2018-05-01 DOI: 10.1109/FCS.2018.8597579
Matthew Aldous, S. Viswam, J. Bass, M. Menchetti, Qasim Ubaid, Jonathan M. Jones, David Morris, P. Molony, Markus Gellesch, K. Bongs, Y. Singh, I. Hill, Ross Williams, P. Gill
We report on progress in the development of subsystem-level devices which serve as building blocks for the next generation of portable atomic clocks. Specifically, we discuss the engineering of small, low-power, low-temperature strontium vapour dispensers and a compact optical resonator useful for the stabilisation of multiple lasers.
我们报告了作为下一代便携式原子钟的构建模块的子系统级设备的发展进展。具体来说,我们讨论了小型,低功率,低温锶蒸汽分配器和用于稳定多个激光器的紧凑型光学谐振器的工程。
{"title":"Route to a Portable Optical Clock","authors":"Matthew Aldous, S. Viswam, J. Bass, M. Menchetti, Qasim Ubaid, Jonathan M. Jones, David Morris, P. Molony, Markus Gellesch, K. Bongs, Y. Singh, I. Hill, Ross Williams, P. Gill","doi":"10.1109/FCS.2018.8597579","DOIUrl":"https://doi.org/10.1109/FCS.2018.8597579","url":null,"abstract":"We report on progress in the development of subsystem-level devices which serve as building blocks for the next generation of portable atomic clocks. Specifically, we discuss the engineering of small, low-power, low-temperature strontium vapour dispensers and a compact optical resonator useful for the stabilisation of multiple lasers.","PeriodicalId":180164,"journal":{"name":"2018 IEEE International Frequency Control Symposium (IFCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133589074","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
A Physical Sine-to-Square Converter Noise Model 物理正弦平方变换器噪声模型
Pub Date : 2018-05-01 DOI: 10.1109/FCS.2018.8597525
Attila Kinali
While sinusoid signal sources are used whenever low phase noise is required, conversion to a square wave-form is necessary when interfacing with digital circuits. Although have been analyzed a few times in various context, to the best knowledge of the author, there is no complete treatment and explanation of all noise sources within a sine-to-square converter. We attempt to give a quantitative, predictive and physically based noise model of sine-to-square converters without fitting parameters other than those imposed by the circuit itself.
当需要低相位噪声时使用正弦波信号源,当与数字电路接口时必须转换为方波形式。虽然已经在各种情况下分析了几次,但据作者所知,没有完整的处理和解释正弦转平方转换器内的所有噪声源。我们试图给出一个定量的、预测的和基于物理的正弦到平方转换器的噪声模型,而不需要拟合除电路本身施加的参数以外的参数。
{"title":"A Physical Sine-to-Square Converter Noise Model","authors":"Attila Kinali","doi":"10.1109/FCS.2018.8597525","DOIUrl":"https://doi.org/10.1109/FCS.2018.8597525","url":null,"abstract":"While sinusoid signal sources are used whenever low phase noise is required, conversion to a square wave-form is necessary when interfacing with digital circuits. Although have been analyzed a few times in various context, to the best knowledge of the author, there is no complete treatment and explanation of all noise sources within a sine-to-square converter. We attempt to give a quantitative, predictive and physically based noise model of sine-to-square converters without fitting parameters other than those imposed by the circuit itself.","PeriodicalId":180164,"journal":{"name":"2018 IEEE International Frequency Control Symposium (IFCS)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134135888","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
Low Loss Orthogonal Frequency Coded Surface Acoustic Wave Correlator Filters 低损耗正交频率编码表面声波相关滤波器
Pub Date : 2018-05-01 DOI: 10.1109/FCS.2018.8597577
M. ScottSmith, A. Weeks, D. Malocha
Low loss orthogonal frequency coded (OFC) surface acoustic wave (SAW) correlator filters are demonstrated for use in conjunction with simultaneous transmit and receive (STAR) radios. Single phase unidirectional transducers (SPUDTs) are used to decrease insertion loss of conventional SAW correlators to facilitate use in the transmitter and receiver of STAR radios.
低损耗正交频率编码(OFC)表面声波(SAW)相关滤波器演示用于同时发射和接收(STAR)无线电。单相单向换能器(SPUDTs)用于降低传统声表面波相关器的插入损耗,以方便在STAR无线电的发送和接收中使用。
{"title":"Low Loss Orthogonal Frequency Coded Surface Acoustic Wave Correlator Filters","authors":"M. ScottSmith, A. Weeks, D. Malocha","doi":"10.1109/FCS.2018.8597577","DOIUrl":"https://doi.org/10.1109/FCS.2018.8597577","url":null,"abstract":"Low loss orthogonal frequency coded (OFC) surface acoustic wave (SAW) correlator filters are demonstrated for use in conjunction with simultaneous transmit and receive (STAR) radios. Single phase unidirectional transducers (SPUDTs) are used to decrease insertion loss of conventional SAW correlators to facilitate use in the transmitter and receiver of STAR radios.","PeriodicalId":180164,"journal":{"name":"2018 IEEE International Frequency Control Symposium (IFCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131611946","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
Highly Stable Miniaturized OCXO with Heater-Embedded Ceramic Package 高度稳定的小型化OCXO与加热器嵌入式陶瓷封装
Pub Date : 2018-05-01 DOI: 10.1109/FCS.2018.8597561
W. Hsieh, C. Hsu, Chia-Wei Chen, Chen-Ya Weng, Sheng-Hsiang Kao
This paper reports on the development of a highly stable miniaturized Oven Controlled Crystal Oscillator (OCXO) in the size of 9.7 × 7.5 mm consisting of heater-embedded ceramic package. The embedded heater layer establishes a symmetrical thermal field to achieve good temperature uniformity, which maintains the oven stability and reduce the power consumption. In addition, the SC-cut crystal is utilized for the proposed miniaturized OCXO to further improve the temperature stability, aging, and phase noise. As a result, this 9.7 × 7.5 mm OCXO has achieved temperature stability of ±3 ppb across −40 to 85 °C. Furthermore, we also demonstrated the proposed miniaturized OCXO could be complied with Stratum 3E requirements.
本文报道了一种高稳定的小型化烤箱控制晶体振荡器(OCXO),其尺寸为9.7 × 7.5 mm,由嵌入加热器的陶瓷封装组成。嵌入式加热层建立了对称的热场,实现了良好的温度均匀性,保持了烘箱的稳定性,降低了功耗。此外,SC-cut晶体被用于所提出的小型化OCXO,以进一步改善温度稳定性,老化和相位噪声。因此,这款9.7 × 7.5 mm OCXO在−40至85°C范围内实现了±3 ppb的温度稳定性。此外,我们还证明了所提出的小型化OCXO可以满足地层3E的要求。
{"title":"Highly Stable Miniaturized OCXO with Heater-Embedded Ceramic Package","authors":"W. Hsieh, C. Hsu, Chia-Wei Chen, Chen-Ya Weng, Sheng-Hsiang Kao","doi":"10.1109/FCS.2018.8597561","DOIUrl":"https://doi.org/10.1109/FCS.2018.8597561","url":null,"abstract":"This paper reports on the development of a highly stable miniaturized Oven Controlled Crystal Oscillator (OCXO) in the size of 9.7 × 7.5 mm consisting of heater-embedded ceramic package. The embedded heater layer establishes a symmetrical thermal field to achieve good temperature uniformity, which maintains the oven stability and reduce the power consumption. In addition, the SC-cut crystal is utilized for the proposed miniaturized OCXO to further improve the temperature stability, aging, and phase noise. As a result, this 9.7 × 7.5 mm OCXO has achieved temperature stability of ±3 ppb across −40 to 85 °C. Furthermore, we also demonstrated the proposed miniaturized OCXO could be complied with Stratum 3E requirements.","PeriodicalId":180164,"journal":{"name":"2018 IEEE International Frequency Control Symposium (IFCS)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123328335","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: 6
Investigation into a GPS Time Pulse Radiator for Testing Time-Stamp Accuracy of a Radio Telescope 用于射电望远镜时间戳精度测试的GPS时间脉冲辐射器研究
Pub Date : 2018-05-01 DOI: 10.1109/FCS.2018.8597477
Z. Ramudzuli, T. Abbott
The MeerKAT radio telescope under construction in South Africa is required to tag the arrival time of a signal to within 10 ns of Coordinated Universal Time (UTC). The telescope has a local maser clock ensemble, compared to UTC by dual-band GPS receivers, and transferred to the digitizers of the array by an optical fiber system. In order to verify the accuracy of the end-to-end time tagging of samples, a portable instrument was constructed that transmits a periodic time signal. This GPS time pulse radiator (GTR) is mounted 10 m away from the telescope L-band feed horn, and radiates a broadband signal of −20 dBm. The signal is modulated by turning off at each UTC second, using the 1PPS output of a GPS receiver. The recorded voltage stream of the telescope is searched for the time signal and the corresponding timestamp compared to its expected value. While less accurate than the masers and dual-band GPS, this technique is simple and the instrument is easily characterized. Laboratory tests of the GTR showed its RF pulse to be at $1.65pm 0.1 mu mathbf{s}$ after the UTC second. Tests on the telescope revealed a $13.0pm 0.3 mu mathrm{s}$ deviation from the expected timestamp value. This was later found to be due to a buffer in the digitizer FPGA, and confirmed by pulsar timing. The GTR concept allows simple, independent testing of a radio telescope pulsar timing system. Future work is planned to improve the shape of the transmitted signal, to study GPS timing errors and correction techniques, and to process the received data using a more standard pulsar timing pipeline.
南非正在建设的MeerKAT射电望远镜被要求将信号的到达时间标记在协调世界时(UTC) 10纳秒以内。望远镜有一个本地脉泽时钟集合,通过双频GPS接收器与UTC相比较,并通过光纤系统传输到阵列的数字化仪。为了验证样品端到端时间标记的准确性,构建了一种传输周期时间信号的便携式仪器。该GPS时间脉冲辐射器(GTR)安装在距离望远镜l波段馈电喇叭10 m处,辐射−20 dBm的宽带信号。信号通过在每个UTC秒关闭来调制,使用GPS接收器的1PPS输出。从望远镜记录的电压流中寻找时间信号,并将其与期望值相比较,得到相应的时间戳。虽然不如脉泽和双频GPS精确,但这种技术很简单,仪器很容易表征。实验室测试表明,GTR的射频脉冲在UTC秒后为$1.65pm 0.1 mu mathbf{s}$。对望远镜的测试显示,与预期的时间戳值有13.0pm 0.3 mu mathm {s}$的偏差。后来发现这是由于数字化仪FPGA中的缓冲,并通过脉冲星定时证实。GTR概念允许对射电望远镜脉冲星计时系统进行简单、独立的测试。未来的工作计划是改进传输信号的形状,研究GPS授时误差和校正技术,并使用更标准的脉冲星授时管道处理接收到的数据。
{"title":"Investigation into a GPS Time Pulse Radiator for Testing Time-Stamp Accuracy of a Radio Telescope","authors":"Z. Ramudzuli, T. Abbott","doi":"10.1109/FCS.2018.8597477","DOIUrl":"https://doi.org/10.1109/FCS.2018.8597477","url":null,"abstract":"The MeerKAT radio telescope under construction in South Africa is required to tag the arrival time of a signal to within 10 ns of Coordinated Universal Time (UTC). The telescope has a local maser clock ensemble, compared to UTC by dual-band GPS receivers, and transferred to the digitizers of the array by an optical fiber system. In order to verify the accuracy of the end-to-end time tagging of samples, a portable instrument was constructed that transmits a periodic time signal. This GPS time pulse radiator (GTR) is mounted 10 m away from the telescope L-band feed horn, and radiates a broadband signal of −20 dBm. The signal is modulated by turning off at each UTC second, using the 1PPS output of a GPS receiver. The recorded voltage stream of the telescope is searched for the time signal and the corresponding timestamp compared to its expected value. While less accurate than the masers and dual-band GPS, this technique is simple and the instrument is easily characterized. Laboratory tests of the GTR showed its RF pulse to be at $1.65pm 0.1 mu mathbf{s}$ after the UTC second. Tests on the telescope revealed a $13.0pm 0.3 mu mathrm{s}$ deviation from the expected timestamp value. This was later found to be due to a buffer in the digitizer FPGA, and confirmed by pulsar timing. The GTR concept allows simple, independent testing of a radio telescope pulsar timing system. Future work is planned to improve the shape of the transmitted signal, to study GPS timing errors and correction techniques, and to process the received data using a more standard pulsar timing pipeline.","PeriodicalId":180164,"journal":{"name":"2018 IEEE International Frequency Control Symposium (IFCS)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127543793","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
Method for Measuring the Properties of Liquid by a Single QCM at Different Temperatures 用单个QCM测量不同温度下液体性质的方法
Pub Date : 2018-05-01 DOI: 10.1109/FCS.2018.8597558
Shuang Liao, P. Ye, Feng Tan, Jiquan Chen, Shuaishuai Shi
As an ultra-sensitive mass sensing device, quartz crystal microbalance (QCM) is widely used in gas phase and liquid phase. Previous research reported a novel theoretical model and a new method to separate measurement of density and viscosity of liquid only using a single QCM, based on the analysis of frequency response at room temperature. In this paper, current experimental results demonstrate the method for measuring properties of liquid by using a single QCM is valid at different temperatures.
石英晶体微天平作为一种超灵敏的质量传感装置,在气相和液相中有着广泛的应用。先前的研究报道了一种新的理论模型和一种新的方法,基于对室温下频率响应的分析,仅使用单个QCM就可以分离测量液体的密度和粘度。本文的实验结果表明,在不同温度下,用单个QCM测量液体性质的方法是有效的。
{"title":"Method for Measuring the Properties of Liquid by a Single QCM at Different Temperatures","authors":"Shuang Liao, P. Ye, Feng Tan, Jiquan Chen, Shuaishuai Shi","doi":"10.1109/FCS.2018.8597558","DOIUrl":"https://doi.org/10.1109/FCS.2018.8597558","url":null,"abstract":"As an ultra-sensitive mass sensing device, quartz crystal microbalance (QCM) is widely used in gas phase and liquid phase. Previous research reported a novel theoretical model and a new method to separate measurement of density and viscosity of liquid only using a single QCM, based on the analysis of frequency response at room temperature. In this paper, current experimental results demonstrate the method for measuring properties of liquid by using a single QCM is valid at different temperatures.","PeriodicalId":180164,"journal":{"name":"2018 IEEE International Frequency Control Symposium (IFCS)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126389105","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
2018 IEEE International Frequency Control Symposium (IFCS)
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