光学测量系统信噪比优化方法研究 |
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作者姓名: | 李卓然 李雨霄 蒋依芹 刘子龙 |
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作者单位: | 中国计量科学研究院,北京100029,中国电力科学研究院有限公司,北京100192 |
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基金项目: | 国家自然科学基金面上项目(61875180)%国家重点研发计划(2017YFF0205103)。 |
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摘 要: | 在光学测量中常常受低信噪比问题的影响,导致测量结果的不确定度增大。近红外波段双向反射分布函数(BRDF)的测量由于红外信号强度偏弱,易受环境干扰,面临的低信噪比问题尤其突出。光学测量系统的信噪比问题一般产生自探测系统,对于红外测量系统来说,经常使用斩波器、锁相放大器进行弱信号测量,但同时也引入了噪声问题。因此,本文针对近红外波段BRDF测量信噪比问题,从探测器、斩波器、锁相放大器三部分着手,分析噪声来源并针对性地提出抑制方法与优化措施,以提升信号信噪比。优化后的测量系统较优化前抗噪声能力提高,可重复性由优化前的2.1%提升到1.6%。
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关 键 词: | 信噪比 噪声抑制 锁相放大器 斩波器 双向反射分布函数 近红外 |
Research on Optimization Method of Signal-to-Noise Ratio in Optical Measurement Systems |
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Authors: | LI Zhuoran LI Yuxiao JIANG Yiqin LIU Zilong |
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Abstract: | Optical measurement are often affected by low signal-to-noise ratios (SNR), resulting in larger measurement uncertainty. Measurement of the bidirectional reflectance distribution function (BRDF) in the near-infrared is particularly vulnerable to environmental interference due to weak infrared signals. The signal-to-noise ratio problem of optical measurement systems generally arises from detection systems. For infrared measurement systems, choppers and lock-in amplifiers are often used for weak signal measurement, but noise problems are also introduced at the same time. Therefore, this article focuses on the SNR of BRDF measurement in the near-infrared, aiming at the detector, chopper and lock-in amplifier, analyzing the source of noise, and proposing suppression methods and optimization measures to improve the signal-to-noise ratio. The optimized measurement system has improved anti-noise ability compared with that before optimization, and the repeatability has been improved from 2.1% to 1.6%. |
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Keywords: | signal-to-noise ratio noise suppression lock-in amplifier chopper bidirectional reflection distribution function near infrared |
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