基于射频噪声源下的离轴积分腔输出光谱技术中腔镜反射率标定研究

大气与环境光学学报 ›› 2023, Vol. 18 ›› Issue (5): 494-502.

• 环境光学监测技术 • 上一篇

基于射频噪声源下的离轴积分腔输出光谱技术中腔镜反射率标定研究

田兴 1,2,3, 朱乐文 2,3, 李龙 1,2,3, 华子森 1,2,3, 曹亚南 1, 程刚 1*

1 安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室, 安徽淮南 232001; 2 安徽理工大学人工智能学院, 安徽淮南 232001; 3 人工智能与大数据研究院, 安徽淮南 232001

收稿日期:2022-07-31 修回日期:2022-09-14 出版日期:2023-09-28 发布日期:2023-10-11
通讯作者: E-mail: chgmech@mail.ustc.edu.cn E-mail:chgmech@mail.ustc.edu.cn
作者简介:田兴(1990- ), 安徽淮北人, 博士, 讲师, 硕士生导师, 主要从事高灵敏度光谱方面的研究。E-mail: txtian@mail.ustc.edu.cn
基金资助:
国家自然科学基金 (62105005 ), 安徽省教育厅重点项目 (KJ2020A0290)

Calibration of cavity mirror reflectivity in off-axis integrated cavity output spectroscopy based on radio frequency noise sources

TIAN Xing 1, 2, 3, ZHU Lewen 2, 3, LI Long 1, 2, 3, HUA Zisen 1, 2, 3, CAO Yanan 1, CHENG Gang 1*

1 State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, China; 2 School of Artificial Intelligence, Anhui University of Science and Technology, Huainan 232001, China; 3 Institute of Artificial Intelligence and Big Data, Anhui University of Science and Technology, Huainan 232001, China

Received:2022-07-31 Revised:2022-09-14 Online:2023-09-28 Published:2023-10-11
Contact: Gang -Cheng E-mail:chgmech@mail.ustc.edu.cn

摘要/Abstract

摘要： 离轴积分腔输出光谱技术具有实验装置简单、灵敏度高、响应时间快等特点，常被应用于一些超高灵敏度的气体探测领域。高反射率镜片作为系统的重要组成部分，其反射率是影响整个光谱系统测量准确性的重要因素之一。结合射频噪声源搭建了一套离轴积分腔输出光谱测量系统，首先以CH4气体在6046.96 cm-1处的吸收谱线作为研究目标，对不同压力下有无噪声源时的腔镜反射率进行了标定研究，结果表明在有无噪声源两种不同条件下标定的镜片反射率具有一致性，而且反射率随着压力的增加有降低的趋势，计算得到的镜片最高反射率约为0.99992。进而对有无噪声源时0.4 μmol/mol 浓度下的CH4测量信号进行了研究，发现引入噪声源后，虽然降低了信号的峰值高度，但信噪比提高了约1.3 倍，最小可检测浓度为0.0045 μmol/mol，表明该系统可有效用于大气环境以及工业应用过程中的 CH4高灵敏度测量。

关键词: 光谱学, 离轴积分腔输出光谱, 射频噪声源, 腔镜反射率, 信噪比

Abstract: Off-axis integral cavity output spectroscopy technology has the characteristics of simple experimental setup, high sensitivity and fast response time, and is widely used in various ultra-sensitive gas detection fields. As an important part of the system, the high reflectivity mirrors are one of the important factors affecting the accuracy measurement of the entire spectral system. A set of off-axis integral cavity output spectral measurement system was built with the radio frequency noise source. Firstly, the absorption spectrum line of CH4 gas at 6046.96 cm-1 was taken as the research target, and the reflectivity of the cavity mirror was calibrated under different pressures with and without noise sources. The results show that the reflectivity calibrated under two different conditions, with and without noise sources, is consistent, and the reflectivity tends to decrease with the increase of pressure. The calculated highest reflectivity of the lens is about 0.99992. Furthermore, the CH4 measurement signal at a concentration of 0.4 μmol/mol with and without noise sources was studied. It is found that after introducing noise sources, although the signal peak height is reduced, the signal-to-noise ratio is increased by about 1.3 times, and the minimum detectable concentration is 0.0045 μmol/mol, which indicates that the developed system can be effectively used for high sensitivity measurement of CH4 in atmospheric environment and industrial applications.

Key words: spectroscopy, off-axis integral cavity output spectroscopy, radio frequency noise source; reflectance of the cavity mirror, signal-to-noise ratio

中图分类号:

O433

田兴, 朱乐文, 李龙, 华子森, 曹亚南, 程刚 . 基于射频噪声源下的离轴积分腔输出光谱技术中腔镜反射率标定研究[J]. 大气与环境光学学报, 2023, 18(5): 494-502.

TIAN Xing , , , ZHU Lewen , , LI Long , , , HUA Zisen , , , CAO Yanan , CHENG Gang . Calibration of cavity mirror reflectivity in off-axis integrated cavity output spectroscopy based on radio frequency noise sources[J]. Journal of Atmospheric and Environmental Optics, 2023, 18(5): 494-502.

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基于射频噪声源下的离轴积分腔输出光谱技术中腔镜反射率标定研究

Calibration of cavity mirror reflectivity in off-axis integrated cavity output spectroscopy based on radio frequency noise sources

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