Research on Optimization Method of Signal-to-Noise Ratio in Optical Measurement Systems

LI Zhuoran; LI Yuxiao; JIANG Yiqin; LIU Zilong

doi:10.12338/j.issn.2096-9015.2021.0528

Volume 66 Issue 2

Feb. 2022

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Article Navigation > Metrology Science and Technology > 2022 > 66(2): 50-54

LI Zhuoran, LI Yuxiao, JIANG Yiqin, LIU Zilong. Research on Optimization Method of Signal-to-Noise Ratio in Optical Measurement Systems[J]. Metrology Science and Technology, 2022, 66(2): 50-54. doi: 10.12338/j.issn.2096-9015.2021.0528

Citation:

LI Zhuoran, LI Yuxiao, JIANG Yiqin, LIU Zilong. Research on Optimization Method of Signal-to-Noise Ratio in Optical Measurement Systems[J]. Metrology Science and Technology, 2022, 66(2): 50-54. doi: 10.12338/j.issn.2096-9015.2021.0528

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Research on Optimization Method of Signal-to-Noise Ratio in Optical Measurement Systems

doi: 10.12338/j.issn.2096-9015.2021.0528

1.
National Institute of Metrology, Beijing 100029, China
2.
China Electric Power Research Institute, Beijing 100192, China

Available Online: 2021-12-02
Publish Date: 2022-02-18

Abstract

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%.
- signal-to-noise ratio,
- noise suppression,
- lock-in amplifier,
- chopper,
- bidirectional reflection distribution function,
- near infrared

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References(18)

References

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