基于TDLAS甲烷检测系统压强补偿的研究
Research on Pressure Compensation of TDLAS Methane Detection System
朱傲 1孟腾飞 2武海东1
作者信息
- 1. 太原师范学院计算机科学与技术学院,山西晋中 030619
- 2. 太原师范学院物理系,山西晋中 030619
- 折叠
摘要
基于可调谐半导体激光吸收光谱技术,在1653 nm波段结合波长调制光谱吸收技术(WMS),使用光程为14 m长的Herriott型多光程池组成了气体检测系统,并通过此系统在常温常压的条件下,对CH4进行测量实验,其中拟合决定系数为0.998.为了分析压强对二次谐波信号的影响,通过此系统测量了不同压强对应的二次谐波信号,将二次谐波信号幅值与压强进行线性拟合,线性关系良好.通过二次谐波过零点间距的解析式计算得到被测气体压强,并通过拟合公式实现无需压力传感装置的压强补偿功能,在负压情景下的工业测量具有较广泛的应用前景.
Abstract
Based on tunable semiconductor laser absorption spectroscopy technology,com-bined with wavelength modulated spectral absorption technology(WMS)in the 1653 nm wavelength band,a gas detection system was composed of a Herriott type multi path cell with an optical path length of 14 m.Through this system,CH4 was measured under normal temperature and pressure condi-tions,with a fitting determination coefficient of 0.998.In order to analyze the influence of pressure on the second harmonic signal,this system was used to measure the second harmonic signals correspond-ing to different pressures.The amplitude of the second harmonic signal was linearly fitted with the pres-sure,and the linear relationship was good.The pressure of the measured gas is calculated using an ana-lytical formula for the zero crossing distance of the second harmonic,and the pressure compensation function without the need for a pressure sensing device is achieved through a fitting formula.This has a wide range of application prospects in industrial measurement under negative pressure scenarios.
关键词
气体检测系统/吸收光谱技术/二次谐波信号/压强补偿Key words
gas detection system/absorption spectroscopy technology/second harmonic sig-nal/pressure compensation引用本文复制引用
基金项目
山西省高等学校科技创新项目(2020L0519)
出版年
2024
NETL
NSTL
万方数据