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一种结合频分复用和归一化波长调制光谱技术的用于远程多物种检测的稳健光学传感器。

A Robust Optical Sensor for Remote Multi-Species Detection Combining Frequency-Division Multiplexing and Normalized Wavelength Modulation Spectroscopy.

作者信息

Jin Wenling, Zhang Hui, Hu Mai, Hu Mengpeng, Wei Yubin, Liang Jingqiu, Kan Ruifeng, Wang Qiang

机构信息

State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.

University of Chinese Academy of Sciences, Beijing 100049, China.

出版信息

Sensors (Basel). 2021 Feb 4;21(4):1073. doi: 10.3390/s21041073.

DOI:10.3390/s21041073
PMID:33557382
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7915438/
Abstract

By combining frequency-division multiplexing and normalized wavelength modulation spectroscopy, a robust remote multi-species sensor was developed and demonstrated for practical hydrocarbon monitoring. Independently modulated laser beams are combined to simultaneously interrogate different gas samples using an open-ended centimeter-size multipass cell. Gas species of interest are demodulated with the second harmonics to enhance sensitivity, and high immunity to laser power variation is achieved by normalizing to the corresponding first harmonics. Performance of the optical sensor was experimentally evaluated using methane (CH) and acetylene (CH) samples, which were separated by a 3-km fiber cable from the laser source. Sub-ppm sensitivity with 1-s time resolution was achieved for both gas species. Moreover, even with large laser intensity fluctuations ranging from 0 to 6 dB, the noise can be kept within 1.38 times as much as that of a stable intensity case. The reported spectroscopic technique would provide a promising optical sensor for remote monitoring of multi hazardous gases with high robustness.

摘要

通过结合频分复用和归一化波长调制光谱技术，开发并展示了一种用于实际碳氢化合物监测的强大远程多物种传感器。独立调制的激光束被组合起来，使用开放式厘米尺寸多程池同时探测不同的气体样本。利用二次谐波对感兴趣的气体物种进行解调以提高灵敏度，并通过对相应的一次谐波进行归一化来实现对激光功率变化的高抗性。使用甲烷（CH）和乙炔（CH）样本对光学传感器的性能进行了实验评估，这些样本通过3公里长的光纤电缆与激光源分离。两种气体物种均实现了亚ppm灵敏度和1秒时间分辨率。此外，即使激光强度在0至6 dB范围内有较大波动，噪声也能保持在稳定强度情况下的1.38倍以内。所报道的光谱技术将为远程监测多种有害气体提供一种具有高鲁棒性的有前景的光学传感器。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/63a9244daaee/sensors-21-01073-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/cd318fa94d95/sensors-21-01073-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/f0198b4b686f/sensors-21-01073-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/3ebe3789621d/sensors-21-01073-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/686d266a0251/sensors-21-01073-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/00a659724511/sensors-21-01073-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/a7b32ed074f4/sensors-21-01073-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/3d477f011e73/sensors-21-01073-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/6d63ab8511ff/sensors-21-01073-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/b5bfa4898bca/sensors-21-01073-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/63a9244daaee/sensors-21-01073-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/cd318fa94d95/sensors-21-01073-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/f0198b4b686f/sensors-21-01073-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/3ebe3789621d/sensors-21-01073-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/686d266a0251/sensors-21-01073-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/00a659724511/sensors-21-01073-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/a7b32ed074f4/sensors-21-01073-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/3d477f011e73/sensors-21-01073-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/6d63ab8511ff/sensors-21-01073-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/b5bfa4898bca/sensors-21-01073-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a79/7915438/63a9244daaee/sensors-21-01073-g010.jpg

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