A Versatile Multiple-Pass Raman System for Industrial Trace Gas Detection

The fast and in-line multigas detection is critical for a variety of industrial applications. In the present work, we demonstrate the utility of multiple-pass-enhanced Raman spectroscopy as a unique tool for sensitive industrial multigas detection. Instead of using spherical mirrors, D-shaped mirror...

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Autores principales:	Chunlei Shen, Chengwei Wen, Xin Huang, Xinggui Long
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	industrial process control multiple-pass Raman spectroscopy multiple-point detection multigas analysis Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/881e201e16614fb3a6de3a2c6aa2437e
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id	oai:doaj.org-article:881e201e16614fb3a6de3a2c6aa2437e
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spelling	oai:doaj.org-article:881e201e16614fb3a6de3a2c6aa2437e2021-11-11T19:09:47ZA Versatile Multiple-Pass Raman System for Industrial Trace Gas Detection10.3390/s212171731424-8220https://doaj.org/article/881e201e16614fb3a6de3a2c6aa2437e2021-10-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/21/7173https://doaj.org/toc/1424-8220The fast and in-line multigas detection is critical for a variety of industrial applications. In the present work, we demonstrate the utility of multiple-pass-enhanced Raman spectroscopy as a unique tool for sensitive industrial multigas detection. Instead of using spherical mirrors, D-shaped mirrors are chosen as cavity mirrors in our design, and 26 total passes are achieved in a simple and compact multiple-pass optical system. Due to the large number of passes achieved inside the multiple-pass cavity, experiments with ambient air show that the noise equivalent detection limit (3σ) of 7.6 Pa (N<sub>2</sub>), 8.4 Pa (O<sub>2</sub>) and 2.8 Pa (H<sub>2</sub>O), which correspond to relative abundance by volume at 1 bar total pressure of 76 ppm, 84 ppm and 28 ppm, can be achieved in one second with a 1.5 W red laser. Moreover, this multiple-pass Raman system can be easily upgraded to a multiple-channel detection system, and a two-channel detection system is demonstrated and characterized. High utilization ratio of laser energy (defined as the ratio of laser energy at sampling point to the laser output energy) is realized in this design, and high sensitivity is achieved in every sampling position. Compared with single-point sampling system, the back-to-back experiments show that LODs of 8.0 Pa, 8.9 Pa and 3.0 Pa can be achieved for N<sub>2</sub>, O<sub>2</sub> and H<sub>2</sub>O in one second. Methods to further improve the system performance are also briefly discussed, and the analysis shows that similar or even better sensitivity can be achieved in both sampling positions for practical industrial applications.Chunlei ShenChengwei WenXin HuangXinggui LongMDPI AGarticleindustrial process controlmultiple-pass Raman spectroscopymultiple-point detectionmultigas analysisChemical technologyTP1-1185ENSensors, Vol 21, Iss 7173, p 7173 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	industrial process control multiple-pass Raman spectroscopy multiple-point detection multigas analysis Chemical technology TP1-1185
spellingShingle	industrial process control multiple-pass Raman spectroscopy multiple-point detection multigas analysis Chemical technology TP1-1185 Chunlei Shen Chengwei Wen Xin Huang Xinggui Long A Versatile Multiple-Pass Raman System for Industrial Trace Gas Detection
description	The fast and in-line multigas detection is critical for a variety of industrial applications. In the present work, we demonstrate the utility of multiple-pass-enhanced Raman spectroscopy as a unique tool for sensitive industrial multigas detection. Instead of using spherical mirrors, D-shaped mirrors are chosen as cavity mirrors in our design, and 26 total passes are achieved in a simple and compact multiple-pass optical system. Due to the large number of passes achieved inside the multiple-pass cavity, experiments with ambient air show that the noise equivalent detection limit (3σ) of 7.6 Pa (N<sub>2</sub>), 8.4 Pa (O<sub>2</sub>) and 2.8 Pa (H<sub>2</sub>O), which correspond to relative abundance by volume at 1 bar total pressure of 76 ppm, 84 ppm and 28 ppm, can be achieved in one second with a 1.5 W red laser. Moreover, this multiple-pass Raman system can be easily upgraded to a multiple-channel detection system, and a two-channel detection system is demonstrated and characterized. High utilization ratio of laser energy (defined as the ratio of laser energy at sampling point to the laser output energy) is realized in this design, and high sensitivity is achieved in every sampling position. Compared with single-point sampling system, the back-to-back experiments show that LODs of 8.0 Pa, 8.9 Pa and 3.0 Pa can be achieved for N<sub>2</sub>, O<sub>2</sub> and H<sub>2</sub>O in one second. Methods to further improve the system performance are also briefly discussed, and the analysis shows that similar or even better sensitivity can be achieved in both sampling positions for practical industrial applications.
format	article
author	Chunlei Shen Chengwei Wen Xin Huang Xinggui Long
author_facet	Chunlei Shen Chengwei Wen Xin Huang Xinggui Long
author_sort	Chunlei Shen
title	A Versatile Multiple-Pass Raman System for Industrial Trace Gas Detection
title_short	A Versatile Multiple-Pass Raman System for Industrial Trace Gas Detection
title_full	A Versatile Multiple-Pass Raman System for Industrial Trace Gas Detection
title_fullStr	A Versatile Multiple-Pass Raman System for Industrial Trace Gas Detection
title_full_unstemmed	A Versatile Multiple-Pass Raman System for Industrial Trace Gas Detection
title_sort	versatile multiple-pass raman system for industrial trace gas detection
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/881e201e16614fb3a6de3a2c6aa2437e
work_keys_str_mv	AT chunleishen aversatilemultiplepassramansystemforindustrialtracegasdetection AT chengweiwen aversatilemultiplepassramansystemforindustrialtracegasdetection AT xinhuang aversatilemultiplepassramansystemforindustrialtracegasdetection AT xingguilong aversatilemultiplepassramansystemforindustrialtracegasdetection AT chunleishen versatilemultiplepassramansystemforindustrialtracegasdetection AT chengweiwen versatilemultiplepassramansystemforindustrialtracegasdetection AT xinhuang versatilemultiplepassramansystemforindustrialtracegasdetection AT xingguilong versatilemultiplepassramansystemforindustrialtracegasdetection
_version_	1718431595895980032

A Versatile Multiple-Pass Raman System for Industrial Trace Gas Detection

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