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Research on flame image processing of climbazole production line based on RGB+HSI color model 基于RGB+HSI颜色模型的克里巴唑生产线火焰图像处理研究
Pub Date : 2023-05-31 DOI: 10.1117/12.2683898
Zhan Su, HaiQi Xi, Yan Gao, Lin Zhang, Ben Yang, Zhifeng Zhang
The existing fire alarm system has strict distance and installation requirements between the fire point and the detector, and is easy to be interfered by environmental factors. It is not suitable for places with large space and many interference factors such as Climbazole production line. This paper proposed a flame image detection technology based on RGB+HSI color model and the detection system is designed and developed. The experimental results show that the flame image detection system based on RGB+HSI color model has the better recognition efficiency, which meets the real-time and accuracy requirements for early flame image detection in Climbazole production line.
现有的火灾报警系统在火点与探测器之间有严格的距离和安装要求,容易受到环境因素的干扰。不适用于空间大、干扰因素多的场所,如克里巴佐尔生产线。本文提出了一种基于RGB+HSI颜色模型的火焰图像检测技术,并设计开发了火焰图像检测系统。实验结果表明,基于RGB+HSI颜色模型的火焰图像检测系统具有较好的识别效率,满足了克里巴唑生产线早期火焰图像检测的实时性和准确性要求。
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引用次数: 0
Study on thermal emission regulation based on refractory metal Mo microstructures 基于难熔金属Mo组织的热发射调控研究
Pub Date : 2023-05-31 DOI: 10.1117/12.2683100
Haoxuan Xun, Benard K. Chen, Yusheng Zhou, A. Yang, J. Shao, Yaohui Zhan, Xiaofeng Li
Thermal emitter, as one of the important components in the thermal photovoltaic system, is mainly used to absorb the energy radiated by the heat source and convert it into energy that can be absorbed by the photovoltaic cell. We use the RCWA algorithm to optimize the thermal emitter based on the refractory metal Mo microhole array with a quadrangular arrangement. The optimized structure has a high selective emissivity characteristic in the 1-2.4 μm waveband. The averaged emissivity can reach more than 79.6%, which is about 60% higher than that of the unstructured emitter; at the same time, the band emissivity gradually decreases after the wavelength of 2.4 μm, achieving a selective emission control. Using the laser direct writing technology, dry metal etching, and other micro-fabrication techniques, the thermal emitter is fabricated with the feature sizes as follows: the hole diameter, the array period, and the hole depth are 1 μm, 1.4 μm, and 3.4 μm, respectively; the area with microhole structures is 12×12 mm. The experimental measurement suggests that the averaged emissivity arrives at 70.07%. This study provides an alternative candidate for selective thermal emitters and also offers a technical experience for practical applications.
热发射器作为热光伏系统中的重要部件之一,主要用于吸收热源辐射的能量,并将其转化为光伏电池可以吸收的能量。采用RCWA算法对基于难熔金属Mo微孔四边形阵列的热发射体进行优化。优化后的结构在1 ~ 2.4 μm波段具有较高的选择性发射率。平均发射率可达79.6%以上,比非结构化发射极高出约60%;同时,在2.4 μm波长之后,波段发射率逐渐降低,实现了选择性发射控制。采用激光直写技术、干式金属刻蚀等微加工技术,制备出孔径为1 μm、阵列周期为1.4 μm、孔深为3.4 μm的热发射器;微孔结构面积为12×12 mm。实验测量表明,平均发射率达到70.07%。本研究为选择性热辐射体提供了一种新的候选材料,并为实际应用提供了技术经验。
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引用次数: 0
Femtosecond laser pulses inscribed EFBG and its sensing characteristics 飞秒激光脉冲刻录EFBG及其传感特性
Pub Date : 2023-05-31 DOI: 10.1117/12.2684657
Xinyi Liu, P. Jiang, Jialu Wang, Qiang Xu, Tingting Yang, Xinyi Fan
In this paper, we presented the inscription and sensing characteristics of eccentric fiber Bragg gratings (EFBGs) through femtosecond laser. This kind of fiber grating is caused by localized refractive index modulation that deviates from the center of the fiber core. EFBGs were prepared in SMF-28 single-mode fiber by 800nm femtosecond laser point-by-point writing method. The temperature and refractive index sensing properties of the prepared EFBG were investigated. The experimental results show that both the Bragg wavelength and cladding mode resonance wavelength of EFBG increase linearly with temperature and show extremely high-temperature robustness. The temperature sensitivity of Bragg resonance is 14.4 pm/℃. As the SRI increases, the Bragg peak remains unchanged and the cutoff wavelength of EFBG cladding mode resonance red-shifts with a sensitivity of 649.29 nm/RIU.
本文研究了偏心光纤布拉格光栅(efbg)的飞秒激光刻录和传感特性。这种光纤光栅是由偏离光纤芯中心的局部折射率调制引起的。采用800nm飞秒激光逐点写入法在SMF-28单模光纤中制备efbg。研究了所制备的EFBG的温度和折射率传感性能。实验结果表明,EFBG的Bragg波长和包层模式共振波长均随温度线性增加,具有极强的高温鲁棒性。Bragg谐振的温度灵敏度为14.4 pm/℃。随着SRI的增加,Bragg峰保持不变,EFBG包层模式共振的截止波长发生红移,灵敏度为649.29 nm/RIU。
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引用次数: 0
Measuring the orbital angular momentum spectrum of vortex beam disturbed by turbulence 湍流扰动涡旋光束轨道角动量谱的测量
Pub Date : 2023-05-31 DOI: 10.1117/12.2684962
Chao Huang, Lu Bai, Yankun Wang, J. Bai
An experimental scheme based on interferometry is designed to measure the orbital angular momentum spectrum of vortex beam perturbed by turbulence. The orbital angular momentum spectrum of vortex beam can be calculated by using four light intensity images. The laser beam is modulated by a spatial light modulator to obtain a vortex beam, and then passes through another spatial light modulator loaded with a turbulent phase perturbation hologram to interfere with the reference beam. The orbital angular momentum spectrum of the vortex beam can be obtained by making use of two interference patterns and the intensity patterns of the vortex beam and the reference beam. The results show that the experimental scheme can measure the orbital angular momentum spectrum of the vortex beam affected by turbulence.
设计了一种基于干涉测量的实验方案来测量受湍流扰动的涡旋光束轨道角动量谱。利用四种光强图像可以计算出涡旋光束的轨道角动量谱。激光束经过空间光调制器调制得到涡旋光束,然后通过另一个装载湍流相位摄动全息图的空间光调制器干涉参考光束。利用涡旋光束的两种干涉图样和涡旋光束与参考光束的强度图样,可以得到涡旋光束的轨道角动量谱。结果表明,该实验方案可以测量受湍流影响的涡旋光束的轨道角动量谱。
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引用次数: 0
A NiO film photocathode with a signal-weakening photoresponse for hexavalent chromium detection 具有信号减弱光响应的NiO薄膜光电阴极用于六价铬检测
Pub Date : 2023-05-31 DOI: 10.1117/12.2684053
Wenxiang Lu, Lu Ma, Shengchen Ke, Rouxi Zhang, Weijian Zhu, Linling Qin, Shaolong Wu
Photoelectrochemical (PEC) sensors have the advantages of high sensitivity, low background noise, and fast response time, and are suitable for environmental monitoring, biomedical, and chemical industries. In this work, a photocathode whose photoresponses weaken with increasing concentration of the substance is proposed and used for Cr(VI) sensing, and a wide concentration range (0.04−16 µM) for Cr(VI) can be detected by just using one NiO film, with a sensing sensitivity of 0.69 lgC µAµM-1 cm-2 (where C is the concentration) and a low detection limit of 0.01 µM. The successful detection of Cr(VI) was achieved through the signal-weakening photoelectrochemical responses, as evidenced by the decrease in the photocathode signal with increasing Cr(VI) concentration. This can be attributed to the steric hindrance effect caused by the in-situ formation of Cr(OH)3 precipitates. Our proposed scheme can be successfully used for the monitoring of Cr(VI) in drinking water, as the world health organization requirement of 0.96 µM is included in the linear detection range.
光电化学(PEC)传感器具有灵敏度高、背景噪声低、响应时间快等优点,适用于环境监测、生物医学、化工等行业。在这项工作中,提出了一种光响应随物质浓度增加而减弱的光电阴极,并将其用于Cr(VI)的检测,仅使用一层NiO膜就可以检测到Cr(VI)的宽浓度范围(0.04 - 16µM),检测灵敏度为0.69 lgCµaµM-1 cm-2(其中C为浓度),检测限低至0.01µM。随着Cr(VI)浓度的增加,光电阴极信号减弱,从而实现了Cr(VI)的成功检测。这可以归因于原位形成的Cr(OH)3沉淀引起的位阻效应。我们提出的方案可以成功地用于饮用水中Cr(VI)的监测,因为世界卫生组织的要求0.96µM包含在线性检测范围内。
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引用次数: 0
Image fusion dehazing algorithm based on multi-logarithmic transform 基于多对数变换的图像融合去雾算法
Pub Date : 2023-05-31 DOI: 10.1117/12.2683823
Xiaoping Zhou
In hazy scenarios, suspended particles in the atmosphere will absorb and scatter the transmitted natural light, resulting in a serious degradation of image quality obtained by imaging equipment, which greatly affects the visual perception of images. Aiming at the problems such as low contrast, color distortion and lack of detail information in areas with high haze concentration in images acquired by image acquisition equipment in hazy days, this paper proposes a dehazing algorithm based on exposure image fusion based on multi-logarithmic transform, which improves image quality while effectively dehazing images and avoids the edge effect in the sky part of images after dehazing. Firstly, the original hazy image was transformed by logarithmic multiple times to produce multiple images with different exposure to be fused. Then, all the input images with logarithmic transformation and weight graphs were fused by multi-scale pyramid fusion method to obtain the dehazing image. In order to verify the effectiveness of the algorithm in this paper, the results of the proposed algorithm and six mainstream image dehazing algorithms are compared in two aspects: subjective evaluation and objective evaluation. Experimental results show that the image processed by the proposed algorithm presents better visual effects than that processed by other algorithms. The proposed algorithm can effectively improve image contrast, improve image distortion, improve the visibility of detail information in areas with high hazy concentration, and the scenery color is natural. Good results are obtained under two objective evaluation indexes of image quality, namely peak signal-to-noise ratio and structural similarity, which further proves that the algorithm proposed in this paper has good dehazing performance, can effectively improve the image visibility, and has a good overall color preservation degree of the image.
在雾霾场景下,大气中的悬浮粒子会吸收和散射透射的自然光,导致成像设备获得的图像质量严重下降,极大地影响了图像的视觉感受。针对雾霾天气图像采集设备获取的图像对比度低、颜色失真、高雾霾浓度区域缺乏细节信息等问题,本文提出了一种基于多对数变换的曝光图像融合去雾算法,在有效去雾图像的同时提高了图像质量,避免了去雾后图像天空部分的边缘效应。首先,对原始模糊图像进行对数多次变换,得到多幅不同曝光量的图像进行融合;然后,对所有经过对数变换和权图处理的输入图像,采用多尺度金字塔融合方法进行融合,得到去雾图像。为了验证本文算法的有效性,将本文算法与六种主流图像去雾算法的结果从主观评价和客观评价两方面进行了比较。实验结果表明,该算法处理后的图像具有较好的视觉效果。提出的算法能有效提高图像对比度,改善图像失真,提高雾霾浓度高的区域细节信息的可见性,景物色彩自然。在峰值信噪比和结构相似度这两个图像质量的客观评价指标下均取得了较好的效果,进一步证明本文提出的算法具有较好的去雾性能,能够有效提高图像的可见性,并且具有较好的图像整体色彩保持度。
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引用次数: 0
Anomalous wetting behaviors of hierarchical micro-nanostructures parallelly fabricated by ultrafast laser pulses on titanium 超快激光脉冲在钛上平行制备分层微纳结构的异常润湿行为
Pub Date : 2023-05-31 DOI: 10.1117/12.2683536
Q. Fu, K. Lou, Jing Qian, Guande Wang, Quanzhong Zhao
Dual-scale structures with chemical modification were fabricated on the titanium surfaces by a combination of a picosecond (ps) laser parallelly direct writing microstructures, a femtosecond (fs) laser inducing nanoripples and a chemical solution modification. Two kinds of microstructures (microholes and mircopillars) were created at different intervals for comparison, and nanoripples were induced dividually, which provided possibility to evaluate the roles of structures and chemistry. After each step, the samples were cleaned in ultrasonic cleaning machine and stored in seal bags to suppress interferences. The results showed that low surface energy is necessary for hydrophobic on titanium surface, and mircopillar had a greater capacity of wetting regulation. In additions, a “structures saturation effect” was also found, which were disagree with the Wenzel model.
采用皮秒(ps)激光平行直写微结构、飞秒(fs)激光诱导纳米波和化学溶液改性相结合的方法,在钛表面制备了具有化学修饰的双尺度结构。在不同的时间间隔内形成两种微观结构(微孔和微柱)进行比较,并分别诱导纳米波纹,为评价结构和化学的作用提供了可能。每一步结束后,样品在超声波清洗机中清洗,并保存在密封袋中以抑制干扰。结果表明,低表面能是钛表面疏水的必要条件,微柱具有较大的润湿调节能力。此外,还发现了“结构饱和效应”,这与Wenzel模型不一致。
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引用次数: 0
Partially end-pumped 1319 nm Nd:YAG slab laser 部分端泵浦1319 nm Nd:YAG平板激光器
Pub Date : 2023-05-31 DOI: 10.1117/12.2684961
Shengzi Zhang, Tanghan Chen, Xiaomeng Liu, Heng-li Zhang, Jiang-Shan Wang, Heqing Guo
The 1319 nm laser is widely used in sodium beacon, optical communication and laser medical fields, and also a potential pump source for 4.3 μm output. In this work, we reported a laser diode partially end-pumped Nd:YAG slab laser operation at 1319 nm. A stable plano-concave cavity was adopted. The maximum continuous output power of 24.33 W was obtained for the absorbed pump power of 222 W, exhibiting an optical conversion efficiency of 10.96% and a slope efficiency of 23.06%. The beam quality was measured to be M2 = 1.19 in the vertical direction.
1319 nm激光器广泛应用于钠信标、光通信和激光医疗等领域,也是4.3 μm输出的潜在泵浦源。在这项工作中,我们报道了激光二极管部分端泵浦Nd:YAG板状激光在1319 nm的工作。采用稳定的平凹腔。当吸收泵浦功率为222 W时,最大连续输出功率为24.33 W,光转换效率为10.96%,斜率效率为23.06%。在垂直方向上测得光束质量M2 = 1.19。
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引用次数: 1
CuO modified Si nanowires for enzyme-free photoelectrochemical sensing of H2O2 CuO修饰的硅纳米线对H2O2的无酶光电传感
Pub Date : 2023-05-31 DOI: 10.1117/12.2683954
Ruoxi Zhang, Shengchen Ke, Wenxiang Lu, Weijian Zhu, Lu Ma, Linling Qin, Shaolong Wu
Constructing novel hybrid nanostructure has become an effective strategy to enhance the performance of photoelectrochemical (PEC) biosensors. However, most of the H2O2-sensing photoelectrodes require enzyme modification, which limits the working environment and sensing performance. Herein, the burr-like CuO nanostructures are modified on the entire surfaces of the ordered Si nanowires (SiNWs) by using a combination of magnetron sputtering and hydrothermal growth. The optimized CuO@SiNWs heterojunction with a core-shell structure enables enzyme-free PEC detection of H2O2, achieving a sensitivity of 227.76 μAmM-1cm-2 in the concentration range of 0–588 mM and a detection limit of 7.14 μM (Signal/Noise=3). The excellent sensing performance of the CuO@SiNWs is attributed to the large specific surface area provided by SiNWs and the CuO possess desired H2O2-catalytic activity while providing a great number of active sites. In addition, the CuO@SiNWs demonstrates satisfactory optical absorption. This work demonstrates that enzyme-free and highly sensitive H2O2 detection can be achieved by hybrid nanostructure, providing an alternative route to H2O2 sensing.
构建新型杂化纳米结构已成为提高光电化学(PEC)生物传感器性能的有效策略。然而,大多数h2o2传感光电极需要酶修饰,这限制了工作环境和传感性能。本文采用磁控溅射和水热生长相结合的方法在有序硅纳米线(SiNWs)的整个表面上修饰了毛刺状的CuO纳米结构。优化后的CuO@SiNWs异质结核壳结构实现了H2O2的无酶PEC检测,在0 ~ 588 mM的浓度范围内灵敏度为227.76 μ am -1cm-2,检出限为7.14 μM(信噪比=3)。CuO@SiNWs优异的传感性能归功于SiNWs提供的大比表面积和CuO在提供大量活性位点的同时具有理想的h2o2催化活性。此外,CuO@SiNWs具有良好的光吸收性能。这项工作表明,通过混合纳米结构可以实现无酶和高灵敏度的H2O2检测,为H2O2传感提供了另一种途径。
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引用次数: 0
Dual-modulation terahertz device based on amplitude and frequency in VO2 hybrid metamaterial 基于VO2杂化超材料的幅频双调制太赫兹器件
Pub Date : 2023-05-31 DOI: 10.1117/12.2683141
Longyu Shi, Huiwen Shi, Xuteng Zhang, Wanlin Liang, Suqi Zhang, Huijuan Sun, Qing-li Zhou, Cunlin Zhang
Terahertz (THz) waves have great potential applications in communication, imaging, and spectroscopy fields. Effective THz modulators are highly desired to realize those functionalities. Wherein, as a kind of artificial composite material, THz metamaterials can achieve extraordinary responses to the electromagnetic wave through the geometric structure design. Nevertheless, normal metamaterials have no tunability once they have been designed and fabricated. To overcome this issue, active medias have been explored to enable the expected modulation of metamaterials under the external stimuli. Among them, phase transition materials are often used in dynamically tunable THz devices due to their intriguing properties. Particularly, vanadium dioxide (VO2) has attracted attention owing to the reversible physical properties and can exhibit insulator-to-metal transition (IMT) behavior at near room temperature. Here, we explore the strength of the resonance response and the change of spectral lineshape caused by the size variation in the metamaterial unit cell. On this basis, adding VO2 thin film can realize broadband modulation during the IMT process. Furthermore, by incorporating the VO2 patches in the gold microstructure can further achieve the dual modulation of amplitude and frequency simultaneously. The design of VO2 hybrid metamaterial can break the single function limitation of traditional metamaterial modulators, reduce material loss, and open up a new path for the development of multifunctional THz modulators.
太赫兹(THz)波在通信、成像和光谱学领域具有巨大的应用潜力。为了实现这些功能,需要有效的太赫兹调制器。其中,太赫兹超材料作为一种人工复合材料,通过几何结构设计可以实现对电磁波的非凡响应。然而,普通的超材料一旦被设计和制造出来,就没有可调性。为了克服这一问题,研究人员探索了有源介质,使超材料在外界刺激下实现预期的调制。其中,相变材料以其独特的性能被广泛应用于动态可调谐太赫兹器件中。特别是,二氧化钒(VO2)由于其可逆的物理性质和在近室温下可以表现出绝缘体到金属的转变(IMT)行为而引起了人们的关注。在这里,我们探讨了超材料单元胞中由于尺寸变化引起的共振响应强度和谱线形状的变化。在此基础上,在IMT过程中加入VO2薄膜可以实现宽带调制。此外,通过在金微结构中加入VO2贴片,可以进一步实现幅频双调制。VO2混合超材料的设计可以打破传统超材料调制器单一功能的限制,降低材料损耗,为多功能太赫兹调制器的发展开辟了新的途径。
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引用次数: 0
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Optical Frontiers
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