大气与环境光学学报2025，Vol.20Issue(2)：168-175,8.DOI:10.3969/j.issn.1673-6141.2025.02.005
基于共振型光声光谱技术的痕量二氧化碳气体传感系统
Trace carbon dioxide gas sensor based on resonance photoacoustic spectroscopy
摘要
Abstract
Based on a 1.578 μm distributed feedback semiconductor laser,a resonant photoacoustic spectroscopy measurement system for carbon dioxide(CO2)detection is built in this work.In the system,the wavelength is modulated using the optimal frequency of 800 Hz and tuned using sawtooth wave with the value of 1 Hz.In order to improve the intensity of photoacoustic signal,a Herriott type multi optical path cell for photoacoustic detection is designed with the maximum reflection number of 42 times and the corresponding optical path of 8.4 m.The experimental results show that the photoacoustic signal is increased by 11.5 times by multiple reflections,which improves the detection sensitivity of the system.By estimating the signal-to-noise ratio of 196.42 mg/m3 CO2 photoacoustic signal,the limit detection sensitivity of the system is obtained to be 7.26 mg/m3.Further,the Kalman filtering algorithm is used to optimize the continuous acquisition of photoacoustic signals,which improves the robustness of the system,and the detection accuracy of the system is improved by 1.36 times.The system is used to continuously monitor 982.14 mg/m3 standard CO2 gas for 10 hours,and the fluctuation of the measured mass concentration is less than 1.7%,which verifies the accuracy and reliability of the developed CO2 sensor system.This work provides an effective method for real-time measurement of CO2 and other trace gases by near-infrared laser.关键词
光声光谱/二氧化碳/多光程池/波长调制Key words
photoacoustic spectroscopy/carbon dioxide/multipass cell/wavelength modulation分类
物理学引用本文复制引用
杨子健,李琳,郭古青,宫廷,刘强,田亚莉,孙小聪,邱选兵,李传亮..基于共振型光声光谱技术的痕量二氧化碳气体传感系统[J].大气与环境光学学报,2025,20(2):168-175,8.基金项目
国家重点研发计划(2023YFF0718100),国家自然科学基金(62475182),山西省科技创新人才团队专项资助(202304051001034),山西省重点研发计划(202302150101006),江淮前沿技术协同创新中心追梦基金课题(2023-ZM01C002),山西省科研实践创新类项目(2023KY667) （2023YFF0718100）
