脉冲腔衰荡技术探测气溶胶消光系数的研究

Research of detection of aerosol extinction coefficient based on pulse cavity ring-down technology

为了高灵敏度地测量气溶胶消光系数,采用高反射率腔镜以及脉冲腔衰荡的方法,搭建了气溶胶消光系数检测装置。对不同条件下的实际大气进行了测量,对实验结果进行了分析和研究,并与国内外研究成果进行比较。结果表明,由实验装置测量的腔衰荡时间大于40μs,稳定性优于0.3%,探测灵敏度大于1.8×10-7m-1。高反射率腔镜及脉冲腔衰荡方法在研制高灵敏度气溶胶消光系数检测装置中具有较强的可行性。

In order to measure aerosol extinction coefficients with higher sensitivity, a system for measuring aerosol extinction coefficients was set up based on high-reflectivity cavity mirrors and pulse cavity ring-down technology. The actual atmosphere under different conditions was measured. The experimental results were analyzed and studied, and compared with the research results at home and abroad. The results of the experiment show that cavity ring-down time is greater than 40μs, stability is better than 0.3% and detection sensitivity is greater than 1.8 × 10-7m-1. Cavity mirrors with high reflectivity and pulse cavity ring-down technology are quite feasible in development of detection systems of aerosol extinction coefficients with high sensitivity.