摘要
可调谐二极管激光吸收光谱(TDLAS)技术可用于气体温度的高精度快速测量,但目前TDLAS技术研究一般集中在正压范围内,真空环境下该技术的应用研究较少。空间真空环境由于压力极低,传统的接触式温度测量技术存在众多不确定性因素。本文从热力学温度定义出发,提出并分析了TDLAS技术测量空间真空环境下痕量气体分子振-转温度的可能性和精度。同时以C2H2分子1535.393 nm和1535.432nm两条吸收谱线为例,分析了TDLAS技术测量气体分子振-转温度的方法和精度。分析结果表明即使压力达到1.0×10-3Pa,如果在实验中选取吸收强度大的谱线对,同时增加有效吸收光程,可以得到比较理想的吸收信号,实现气体分子振-转温度的测量。
A novel technique was developed to simulate on earth the temperature measurement of the gases in space, based on tunable diode laser absorption spectroscopy（TDLAS）technology. The feasibility, precision, and uncertainty in measurement of the vibration-rotation temperatures of the trace gas molecules in space environment with TDLAS were ad- dressed, and exemplified with the 1535.39 nm and 1535.432 nm absorption spectra of C2H2. The calculated and experimentally simulated results show that the TDLAS technology is feasible to measure the gas temperature in space vacuum, and that even at a pressure lower than 10^-3 Pa,the gas temperature can be measured in fairly high precision when the ab- sorption intensity of the spectnam-pair is strong enough and its effective absorption path is long enough.
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2013年第2期153-158,共6页
Chinese Journal of Vacuum Science and Technology
