基于差分光学吸收光谱技术检测室内空气质量研究

Detection of Indoor Air Quality Based on DOAS Technique

基于差分光学吸收光谱法原理,研究了一套室内空气质量检测装置.用可调谐二极管激光作为传感光源,采用波长调制方法,通过对谐波信号进行光电探测可得气体浓度.还特别设计了一个利用多个凹面反射镜来延长测量光程的光学系统,可提高系统的检测灵敏度.

Based on the principle of differential optical absorption spectrometry （DOAS） ,a set of detecting instrument for indoor air quality is proposed. In the system, a tunable dioxide laser is used as a sensor source, and the method of wavelength modulated is adopted, then concentration of gas is determined through detecting the generated second harmonic by opto - electronics converter. An optical transmission system including several concave mirrors is designed to improve the sensitivity of measurement by extending the optical path for measurement.