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10th Symposium on Novel Optoelectronic Detection technology and Applications

作者： Han, Jian Guo, Xin Jiao, Gangcheng Shi, Feng Cheng, Hongchang Ma, Jing Ma, Donghao Chen, Peng Lei, Shiwei Dou, Zan Zhang, Chi Yan, Lei Science and Technology on Low-Light-Level Night Vision Laboratory Xi'an71005 China Kunming Institute of Physics Kunming650223 China

ISBN: (数字)9781510688155

ISBN: (纸本)9781510688148

In the era of today's ever-changing science and technology, compared with the limitations of traditional direct-vision low-light-level devices, digital low-light-level devices with their unique digital output characteristics are gradually becoming an indispensable core component of a new generation of low-light night vision equipment. It can not only accurately capture and convert weak light into high-quality digital signals, but also achieve intelligent and efficient image processing through highly integrated circuit design and advanced algorithm optimization. This revolutionary progress is more and more being closely watched and highly valued by scientific research institutions, military departments and industry around the world. This paper comprehensively reviews the current mainstream digital low-light-level devices, encompassing low illumination charge-coupled devices (CCD)/complementary metal oxide semiconductor (CMOS), scientific-grade CMOS, image-intensified CCD/CMOS, electron-multiplying CCD, and electron-bombarded APS/CCD. The working mechanisms and the latest research progress of these devices are discussed. In addition, the application of these digital low-light-level devices in many fields are analyzed. Finally, based on the current technological advancements, this paper puts forward the future development trends of low-light-level technology and digital low-light-level devices, which provides valuable insights for research and applications in related domains. © 2025 SPIE.

关键词： CMOS integrated circuits

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Facile fabrication of covalent organic framework functionalized superhydrophobic porous sponges for highly efficient water/oil separation

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science China(Technological sciences) 2022年第11期65卷 2631-2640页

作者： WANG Jing WANG FuShan ZHOU YuJian ZHOU YongJun GAO Peng MEN XueHu School of Materials and Energy Lanzhou UniversityLanzhou 73000China Science and Technology on Low-Light-Level Night Vision Laboratory Xi'an 710065 China

Considering the serious environmental pollution and economic losses caused by increasing oil spills and chemical leaks,effective and eco-friendly methods of oil/water separation should be urgently ***,a facile strategy(about 20 min)was developed for integrating covalent organic framework(COF)particles with melamine sponges(MS)by covalent bonding,and then a superhydrophobic COF/MS composite(denoted OA-CP@MS)could be further obtained by following modification with a 1-octadecylamine/water ***,the synthesis process was developed under a mild condition that avoids the need for sealing and high-temperature *** was proven that the fabricated OA-CP@MS presented a prominent absorption capacity for various organic reagents,in which adsorption capacity of chloroform could be up to 173 g/*** to its excellent chemical robustness in strong alkaline and saline environments and in various organic solvents,the prepared OACP@MS showed a great potential to perform oil/water separation in complex practical *** rapid preparation process,fluorine-free treatment,and water-based modification would extend the application of COF materials in oil/water separation.

关键词： superhydrophobic covalent organic frameworks modification absorption capacity oil/water separation

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Effect of Non-solvent Component on the Compactness of the Organic Membrane and Ion Barrier Film 6

Effect of Non-solvent Component on the Compactness of the Or...

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6th Conference on Frontiers in Optical Imaging and technology: Imaging Detection and Target Recognition

作者： Kaili, Yang Ziheng, Hao Chao, Sun Ni, Zhang Pengbo, Li Yufeng, Zhu Xin, Guo Wanpeng, Yin Science and Technology on Low-Light-Level Night Vision Laboratory Xi'an710065 China Kunming Institute of Physics Kunming650223 China

ISBN: (数字)9781510679733

ISBN: (纸本)9781510679726

As a temporary substrate for preparing the Al2O3 ion barrier film, the continuity of the organic membrane significanttly affects the compactness of the ion barrier film, while the continuity of the organic membrane prepared by water surface spreading method is directly affected by the non-solvent component. In this paper, the effect of ultrapure water, non-deionized water, NaCl solution, NaOH solution and HCl solution as non-solvent component on the compactness of the organic membrane and ion barrier film are studied. The results show that NaCl solution is the best non-solvent component for the preparation the most continuous organic membrane and the most compact Al2O3 ion barrier film. © 2024 SPIE. All rights reserved.

关键词： Deionized water

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Surface Passivation Film Optimization and Electronic Sensitivity Characteristic Test of Back-illuminated CMOS 6

Surface Passivation Film Optimization and Electronic Sensiti...

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6th Conference on Frontiers in Optical Imaging and technology: Novel Imaging Systems

作者： Ma, Jing Xiao, Chao Lei, Shiwei Li, Tongtong Li, Chenglin Yan, Lei Jiao, Gangcheng Science and Technology on Low-Light-Level Night Vision Laboratory Xi’an710065 China Kunming Institute of Physics Kunming650223 China

ISBN: (数字)9781510679719

ISBN: (纸本)9781510679702

As the core component of the electron-bombarded active pixel sensor (EBAPS), the electron-sensitive CMOS (e-CMOS) can be prepared by thinning the surface layer of back-illuminated CMOS (BSI-CMOS), which was named electron sensitization. Due to the dramatic increase of dark current during the electron sensitization of BSI-CMOS, the signal-to-noise ratio and gain characteristics of the prepared EBAPS would be reduced. To solve this problem, this paper proposed a passivation strategy of SiO2 grown by plasma-enhanced chemical vapor deposition (PECVD) to inhibit surface defects, and the optimal SiO2 film thickness was explored through process optimization and electron bombardment system testing. As a result, the dark current was effectively suppressed (~50 e-1/s/pix), and a lower electron-sensitive threshold voltage of 550V was realized. Moreover, the defect states density of SiO2 deposited by PECVD was lower compared to Al2O3, which resulted from the more matched lattice coefficient of SiO2. Finally, EBAPS based on SiO2 passivated e-CMOS was realized, and high-quality imaging was successfully achieved at 1×10-4lx illumination. The above results showed that the SiO2 grown by PECVD can effectively suppress dark current at a thickness of ~5 nm, and reduce the electron-sensitive threshold voltage to 550 V, which provided technical support for the subsequent development of EBAPS devices with high gain and low noise. © 2024 SPIE.

关键词： Silica

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Research and Implementation of EBCMOS Non-uniform Correction Algorithm Based on FPGA

Research and Implementation of EBCMOS Non-uniform Correction...

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2024 Applied Optics and Photonics China: Optical Sensing, Imaging technology, and Applications, AOPC 2024

作者： Ke, Si Jia-Yin, Liu Zhou, Zheng Ye, Yang Xi-Lin, Yuan Yu-Long, Wang Xu-Hong, Li Gang-Cheng, Jiao Science and Technology on Low-light-Level Night Vision Laboratory Xi’an710065 China Kunming Institute of Physics Kunming650223 China

ISBN: (数字)9781510687820

ISBN: (纸本)9781510687813

Because of the non-uniform response generated during the development of EBCMOS(Electron Bombardment Complementary Metal Oxide Semiconductor), the images with non-uniform stripe noise is outputted by EBCMOS in low light environment, which seriously reduces the imaging quality of EBCMOS and has become an urgent problem to be solved. To solve this problem, the reason of stripe noise generation is analyzed, the image processing algorithm based on least squares linear correction model is implemented on FPGA, and the experimentation is completed. According to the result of experiment, this algorithm can eliminate the stripe noise of EBCMOS, and the non-uniformity of the processed image is reduced by almost 75% compared to the pre-processed image, the correction effect is fine. © 2024 SPIE.

关键词： Image analysis

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Research on Adaptive Control Method Based on EBAPS Camera

Research on Adaptive Control Method Based on EBAPS Camera

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2024 Applied Optics and Photonics China: Optical Sensing, Imaging technology, and Applications, AOPC 2024

作者： Jia-Yin, Liu Ke, Si Ye, Yang Zhou, Zheng Xiao-Bing, Ni Hai-Hao, Song Bo, Yan Science and Technology on Low-Light-Level Night Vision Laboratory Xi’an710065 China Kunming Institute of Physics Kunming650223 China

ISBN: (数字)9781510687820

ISBN: (纸本)9781510687813

Based on the working environment and characteristics of EBAPS cameras, a theoretical analysis is conducted on the relationship between camera exposure time, bias voltage, and image brightness information. An adaptive control method based on histogram feature function is proposed and implemented in the camera. Firstly, multi-point metering is used to extract regions of interest, and variable exposure time adjustment steps and bias voltage adjustment steps are designed to reduce the system metering calculation while improving the convergence speed and stability of EBAPS camera adaptive adjustment. The experimental results show that when the light intensity varies within the range of 10-4Lux to 100 Lux, the EBAPS camera can automatically adjust two parameters included bias voltage and exposure time, to stabilize the brightness of the output image, improve the image information entropy and the dynamic range of the camera. This method can also provide reference for subsequent image recognition and target tracking. © 2024 SPIE.

关键词： Exposure controls

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Development of cesium telluride photocathodes for image intensifiers 9

Development of cesium telluride photocathodes for image inte...

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9th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Xu, Shiyu Li, Xiaofeng Liu, Beihong Zhao, Heng Li, Jiaojiao Chen, Chao Chang, Le He, Shuntao Chen, Qijun North Night Vision Technology Co. Ltd Kunming650217 China Science and Technology on Low-Light-Level Night Vision Laboratory Xi'an710065 China

ISBN: (纸本)9781510664432

We developed an UV Solar Blind image intensifiers with 18mm diameter semi-transparent cesium telluride photocathodes in a close proximity focus microchannel plates (MCP) tube. Cs-Te photocathodes have been evaporated onto quartz substrates at an elevated temperature to achieve quantum efficiency (QE) up to 34% and 70mA/W at 254nm, low dark current, low out of band response and high stability. New Cs-Te photocathodes have been fabricated for image intensifiers upgrade, which show fine image resolution, and less variation in high electron gain of the MCP. With these improvements, the image intensifier tube with new Cs-Te photocathodes will expand the application fields in low-light level UV Solar Blind detection. © 2023 SPIE.

关键词： Photocathodes

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Inversion of Optical Constants and Thickness of Multialkali Photocathodes 9

Inversion of Optical Constants and Thickness of Multialkali ...

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9th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Wang, Yun Zeng, Jinneng Gong, Yanni Gao, Bingxiang Li, Yaobin Zhao, Heng Wang, Yijin Li, Tingtao Li, Xiaofeng North Night Vision Technology Co. Ltd Kunming650217 China Science and Technology on Low-Light-Level Night Vision Laboratory Xi'an710065 China

ISBN: (纸本)9781510664432

The image intensifier is the core component of all kinds of low-light-level night vision devices, which are widely used in security, medicine, biology, and other fields of detection and imaging devices. Multialkali photocathode is one of the important parts of the image intensifier photoelectric conversion. Its optical constant and thickness will affect the sensitivity of the image intensifier. The photocathode material is a chemically active alkali metal (Na2KSb (Cs)). When the photocathode is removed from the high-vacuum alkali source environment of the image enhancement tube, its properties will change. Therefore, it has been impossible to directly measure the optical constant and thickness of the photocathode. In this paper, we established the photocathode optical model with the help of the Snellmeier dispersion model. The optical constants and thickness of the photocathode in the visible band 380nm-780nm are obtained for the first time by the full-spectrum fitting method. The deviation between the fitted value and the measured value is 0.03%, which is in good agreement. The optical constants and thickness of the photocathode obtained in this paper can provide more accurate guidance for the optical system design of image intensifiers. In addition, the method can be extended to the analysis of optical properties of other easily oxidized thin film materials by changing the dispersion formula, which has practical significance in the fields of vacuum optoelectronics and optical thin films. © 2023 SPIE.

关键词： Photocathodes

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A Three-Dimensional Simulation Study of Dielectric Modulated TreeFET as a Label-Free Sensor

A Three-Dimensional Simulation Study of Dielectric Modulated...

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7th International Conference on Electronics technology, ICET 2024

作者： Gao, Shujun Miao, Zhuang He, Huiyang Bai, Xiaofeng Tang, Hualian Li, Cong Science and Technology on Low-Light-Level Night Vision Laboratory Xi'an China Xidian University School of Microelectronics Xi'an China

ISBN: (纸本)9798350363951

A dielectric-modulated sensor based on TreeFET with enhanced sensitivity is proposed in this work. This sensor structure can increase the driving current of the device without needing to add additional area. TreeFET-based sensors and NSFET-based sensors with the same structural parameters are discussed and analyzed in several aspects, such as threshold voltage sensitivity, subthreshold swing sensitivity, and switching current ratio sensitivity. The analyzed results show that the performance of the TreeFET-based sensor we proposed is significantly better than that of the NSFET-based sensor. © 2024 IEEE.

关键词： Threshold voltage

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Research on Electron Dispersion Mechanism and Resolution Characteristics of EBAPS

Research on Electron Dispersion Mechanism and Resolution Cha...

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2024 Applied Optics and Photonics China: Optical Sensing, Imaging technology, and Applications, AOPC 2024

作者： Fan, Haibo Yan, Lei Cheng, Hongchang Jiao, Gangcheng Xiao, Chao Han, Jian Qiao, Jiabin Li, Tongtong Science and Technology on Low-Light- Level Night Vision Laboratory Shaanxi Xi’an710065 China Kunming Institute of Physics Yunnan Kunming650223 China

ISBN: (数字)9781510687820

ISBN: (纸本)9781510687813

In response to the high resolution requirements of EBAPS digital low light imaging devices in military and aerospace fields, the spatial modulation transfer function is an objective method to evaluate the resolution of liner photoelectric imaging system. on the basis of the existing GaAs photocathode and CMOS structure, a five-part MTF model of EBAPS devices were constructed using modulation transfer function theory. It was proposed that the electron dispersion and scattering characteristics during electron transmission are the main factors causing the decrease in resolution. We studied the dispersion characteristics of near-field photoelectrons based on the physical model of near-field focusing. Based on the theory of low energy electron solid interaction, we combined Monte Carlo simulation methods to derive and simulate the electron transit and scattering characteristics of the passivation layer. Based on the theory of electron diffusion and drift in semiconductors, We constructed a CMOS electron transport model to analyze the electron transport diffusion characteristics. Finally, the electron dispersion and scattering mechanism of EBAPS is revealed, and the MTF model of EBAPS is established, which is composed of near-field dispersion, CMOS transport diffusion and CMOS chip. Moreover, by optimizing the proximity process parameters to realize the device preparation, the ultimate resolution of EBAPS was increased from 22lp/mm to 32lp/mm. It is pointed out that backscatter dispersion of incident electrons on the CMOS surface is a key method to further improve resolution. This has important guiding significance for the future development of high-resolution EBAPS devices. © 2024 SPIE.

关键词： CMOS integrated circuits

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