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中国科学院 长春光学精密机械与物理研究所, 吉林 长春 130023
[ "李 乐(1985-),男,黑龙江哈尔滨人,博士,副研究员,分别于2007年、2012 年在吉林大学获得学士、博士学位,主要从事微弱信号检测及紫外遥感技术的研究。E-mail: liyue@ciomp.ac.cn" ]
[ "汪龙祺(1978-),男,河南洛阳人,博士,研究员,2012年于中国科学院大学获得博士学位,主要从事高分辨率成像技术与光学设计方面的研究。E-mail: lixuyang2004@126.com" ]
[ "黄 煜(1979-),男,山西朔州人,博士,研究员,硕士生导师,FY-3卫星太阳辐照度光谱仪主任设计师,主要从事空间紫外遥感技术与辐射计量方面的研究。E-mail:ssshycn@yahoo.com.cn" ]
收稿日期:2020-05-09,
修回日期:2020-06-12,
纸质出版日期:2020-12-15
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李乐,汪龙祺,黄煜等.光电探测系统噪声特性研究与降噪设计[J].光学精密工程,2020,28(12):2674-2683.
LI Yue,WANG Long-qi,HUANG Yu,et al.Study on noise characteristics of photoelectric detection system and noise reduction design[J].Optics and Precision Engineering,2020,28(12):2674-2683.
李乐,汪龙祺,黄煜等.光电探测系统噪声特性研究与降噪设计[J].光学精密工程,2020,28(12):2674-2683. DOI: 10.37188/OPE.20202812.2674.
LI Yue,WANG Long-qi,HUANG Yu,et al.Study on noise characteristics of photoelectric detection system and noise reduction design[J].Optics and Precision Engineering,2020,28(12):2674-2683. DOI: 10.37188/OPE.20202812.2674.
本文介绍了一种基于光电倍增管的锁相放大光电探测系统,并定量地对系统中光电倍增管、放大电路、高压电源的噪声特性进行研究,发现高压电源的纹波对系统噪声的影响很大。实验利用三台不同纹波的高压电源测试系统噪声,发现在无光条件下,系统噪声以光电倍增管暗噪声为主,高压纹波噪声近似线性地耦合进系统噪声中;在有光条件下,系统噪声以阳极电流散粒噪声为主,高压纹波贡献的噪声既随光电流增大而增大也与高压纹波正相关。基于以上研究,分析了高压电源的传递函数并优化反馈系数,设计了高稳定低纹波高压电源,高压纹波小于5 mV。系统整机信噪比测试表明,使用自研高压可显著提升系统信噪比,相比较于其他高压电源(纹波15 mV,50 mV),最大信号下分别提升了38%和125%。
A photoelectric detection system based on a lock-in amplifier was developed. The noise characteristics of each part of the system, such as the photomultiplier, amplifier, and high-voltage power supply, were analyzed quantitatively. Research has shown that the ripple of the high-voltage power supply has a significant effect on system noise. Three high-voltage power supplies with different ripples were installed in the system, and the noise was analyzed. The results showed that in darkness, system noise was mainly contributed by photomultiplier anode dark noise and noise from the high-voltage power supply ripple linearly coupling into the system. In light, photomultiplier anode shot noise contributed the most to the system noise, and noise contributed by the high-voltage power supply ripple showed a positive correlation with both light current and ripple value. Based on the above findings, the transfer function of the high-voltage power supply was analyzed, and its feedback coefficient was optimized. A high-voltage power supply with high stability and low ripple (less than 5 mV) was designed. The signal-to-noise ratio test of the system showed that the signal-to-noise ratio could be significantly improved by applying self-developed high-voltage power supplies, which were 38% and 125% higher than those of other high-voltage power sources (ripples of 15 and 50 mV, respectively).
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