基于吸收光谱法的CO_(2)正压测量技术分析北大核心CSCD

为了研究可调谐半导体激光吸收光谱(TDLAS)技术在气体检测过程中,正压条件下的相邻谱线影响问题,建立基于积分吸光度的压力测量模型。以CO_(2)为研究对象,在室温、高纯度条件下进行了范围为(1~2)atm的压力测量仿真和实验。实验结果显示:随着压力的增大,相邻吸收谱线相互影响程度加剧,吸光度曲线偏离零基线的程度加大;实验测量结果在1.25 atm处最大相对偏差为4.94%,在2.00 atm处最小相对偏差为0.73%,平均相对偏差为3%。

CO2 positive pressure measurement technology based on absorption spectroscopy

In order to study the influence of adjacent spectral lines under positive pressure in the gas detection process of tunable diode laser absorption spectroscopy (TDLAS) technology, a pressure measurement model based on integral absorbance was established. Taking CO₂ as the research object, the simulations and experiments of pressure measurement in the range of (1~2) atm were carried out at room temperature and high purity. The results show that as the pressure increases, the degree of mutual influence between adjacent absorption spectral lines increases, and the degree of deviation of the absorbance curve from the zero baseline increases. The pressure measurement results have a maximum relative deviation of 4.94% at 1.25 atm, a minimum relative deviation of 0.73% at 2.00 atm, and an average relative deviation of 3%.