基于数字微镜器件的光谱仪杂散光分析及信噪比增强。

Analysis of Stray Light and Enhancement of SNR in DMD-Based Spectrometers.

机构信息

College of Marine Science and Technology, Hainan Tropical Ocean University, Sanya 572022, China.

Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China.

出版信息

Sensors (Basel). 2022 Aug 19;22(16):6237. doi: 10.3390/s22166237.

DOI:10.3390/s22166237

PMID:36016003

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9413973/

Abstract

Due to advantages such as the high efficiency of light utilization, small volume, and vibration resistance, digital micro-mirror device (DMD)-based spectrometers are widely used in ocean investigations, mountain surveys, and other field science research. In order to eliminate the stray light caused by DMDs, the stray light in DMD-based spectrometers was first measured and analyzed. Then, the stray light was classified into wavelength-related components and wavelength-unrelated components. Moreover, the noise caused by the stray light was analyzed from the perspective of encoding equation, and the de-noising decoding equation was deduced. The results showed that the accuracy range of absorbance was enhanced from [0, 1.9] to [0, 3.1] in single-stripe mode and the accuracy range of absorbance was enhanced from [0, 3.8] to [0, 6.3] in Hadamard transform (HT) multiple-stripe mode. A conclusion can be drawn that the de-noising strategy is feasible and effective for enhancing the SNR in DMD-based spectrometers.

摘要

基于数字微镜器件（DMD）的分光计具有利用效率高、体积小、抗振动等优点，被广泛应用于海洋调查、山地勘测等野外科学研究中。为了消除 DMD 产生的杂散光，首先对基于 DMD 的分光计中的杂散光进行了测量和分析。然后，将杂散光分为与波长相关的分量和与波长无关的分量。此外，还从编码方程的角度分析了杂散光引起的噪声，并推导出了去噪解码方程。结果表明，单条纹模式下的吸光度精度范围从[0,1.9]提高到[0,3.1]，Hadamard 变换（HT）多条纹模式下的吸光度精度范围从[0,3.8]提高到[0,6.3]。可以得出结论，去噪策略对于提高基于 DMD 的分光计中的信噪比是可行且有效的。