19 May 2006 Technique for designing NIR instrument to acquire and process weak signal
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Acquiring useful signal from large noises is a crucial consideration during NIR instrument design. In the paper, the characters of signal and noise in NIR instrument are analyzed and light signal acquiring and disposing process is researched. A practical circuit used in the near infrared diffuse reflection instrument is introduced, and every process in the light signal acquiring and processing is analyzed according to the practical circuit. Besides, some other problems such as the choice of the fittest work frequency are discussed too. The conclusion is that modulating the light signal with optical chopper is an effective method to inhibit the noise, and phase sensitivity detection technique can effectively acquire signals emerged in the noise.
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Weihong Bi, Weihong Bi, Lichun Bai, Lichun Bai, Yuefeng Qi, Yuefeng Qi, } "Technique for designing NIR instrument to acquire and process weak signal", Proc. SPIE 6150, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 61501S (19 May 2006); doi: 10.1117/12.678394; https://doi.org/10.1117/12.678394

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