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可调谐半导体激光吸收光谱(TDLAS)具有高分辨、高灵敏度和快速测量等特点,在环境检测、工业过程检测等方面具有很好的应用前景。但是TDLAS系统在长期连续工作时,存在激光输出波长随环境温度变化而发生漂移的问题。针对这一问题,研究了激光输出波长随环境温度变化特征及其对光谱处理的定量影响。为了消除激光输出波长的漂移,设计了基于ADμC841的温度补偿电路。根据环境温度实时调整激光器的温度,对激光器进行谱线锁定,在温控实验箱中进行了实验,当环境温度为20℃～60℃时,激光器的波长漂移量为4.1pm。
Tunable semiconductor laser absorption spectroscopy (TDLAS) with high resolution, high sensitivity and fast measurement and other characteristics, in the environmental testing, industrial process testing has good application prospects. However, in the long-term continuous operation of the TDLAS system, there is a problem that the output wavelength of the laser drifts as the ambient temperature changes. In response to this problem, the characteristics of laser output wavelength with ambient temperature and its quantitative effect on spectral processing are studied. In order to eliminate the laser output wavelength drift, designed based on ADμC841 temperature compensation circuit. According to the ambient temperature, the temperature of the laser is adjusted in real time, and the laser is locked in line. Experiments are performed in a temperature control experiment box. The wavelength drift of the laser is 4.1pm when the ambient temperature is from 20 ℃ to 60 ℃.