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中红外为分子的基频吸收波段,可被用于痕量气体的高灵敏度检测。介绍了基于中红外室温连续量子级联激光器(CW-QCL)结合波长调制技术(WMS)的光谱检测方法,研究了消除气体间交叉干扰的方法,并进行了相关的验证实验。利用中心波长在1274cm-1波段附近的量子级联激光器搭建了一套开放光路温室气体探测实验系统,进行101m开放式测量实验,实现了对大气中CH4、N2O的同步在线测量,检测限分别为3.87×10-9和1.28×10-9,验证了实验系统和实验方法的可行性,为实现区域高灵敏温室气体监测奠定了基础。
Mid-infrared absorption band for the fundamental frequency of the molecule, can be used for trace gas detection of high sensitivity. The spectral detection method based on CW-QCL combined with wavelength modulation (WMS) is introduced. The method to eliminate the cross interference between gases is introduced and the relevant verification experiments are carried out. A set of open optical path greenhouse gas detection system was set up by using a quantum cascade laser with a center wavelength of 1274cm-1. The open-path measurement experiment was carried out at 101m, and simultaneous on-line measurement of CH4 and N2O in the atmosphere was achieved. The detection limits were 3.87 × 10-9 and 1.28 × 10-9, respectively. The feasibility of the experimental system and experimental method is verified, which lays the foundation for the realization of the regional sensitive greenhouse gas monitoring.