基于TDLAS逃逸氨检测系统压力影响的研究  

Research on the Influence of Pressure on Escape Ammonia Detection System Based on TDLAS

作　　者：甄杨[1] ZHEN Yang(Tianjin Institute of Metrological Supervision and Testing,Tianjin 300192,China)

机构地区：[1]天津市计量监督检测科学研究院

出　　处：《自动化与仪表》2019年第7期44-47,共4页Automation & Instrumentation

摘　　要：基于可调谐半导体激光吸收光谱技术,在1511.88nm波段结合波长调制的方法,在常温常压的条件下,对18m长的光程吸收池内的NH3浓度进行测量。试验表明,在浓度范围(10~100)×10^-6内,NH3的二次谐波幅值与其对应的浓度之间具有良好的线性关系,系统检测极限可达到4×10^-6。为了分析压力变化对测量结果产生的影响,模拟了0~100kPa压力范围的试验,对二次谐波幅值受压力变化影响的关系做出了压力补偿公式,使得检测系统的测量相对误差减小了94.64%,且测量结果的重复性好,适用于恶劣的工业测量环境,具有较广泛的应用前景。Based on tunable semiconductor laser absorption spectroscopy and wavelength modulation at 1511.88 nm,the concentration of NH3 was measured in an optical path absorption cell 18 m long at room temperature and pressure. The experimental results show that the concentration of NH3 has a good linear relationship with its second harmonic amplitude in the concentration range of(10~100)×10^-6,and the detection limit of the system can reach 4×10^-6. The influence of the measurement results is simulated in the pressure range of 0~100 kPa. The pressure compensation formula is made for the relationship between the second harmonic amplitude and the pressure variation. The relative error of the measurement system is reduced by 94.64%,and the repeatability of the measurement results is good. It is suitable for harsh industrial measurement environment and has a wide application prospect.

关 键 词：检测系统 逃逸氨浓度 可调谐半导体激光吸收光谱 压力的影响 修正算法 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置] X831[自动化与计算机技术—控制科学与工程]