中文摘要：

基于腔减相移光谱（CAPS）技术检测灵敏度高、光源性价比好、容易控制和有效吸收光程长等优点,搭建了一套基于CAPS技术的连续测量大气气溶胶消光系数的监测系统。测试系统高反射镜片反射率约为0.9999,对应有效光程约为4.4 km;通过Allan方差测试分析系统最佳积分时间约为80 s,对应消光系数检测极限为0.06Mm-1;将系统应用于实际大气气溶胶消光系数的12个周期和48 h连续监测,显示空腔相移基本稳定,样品测量相移偏移明显,反演得到的大气能见度结果稳定可靠。由此表明,研制的基于CAPS技术的大气气溶胶消光系数连续测量系统应用于实际的测量是完全可行的。

英文摘要：

Cavity attenuated phase shift spectroscopy（CAPS） technique has many advantages such as the impressive detection sensitivity and the high performance-price ratio of light source. It is also easy to control and has a longer effective absorption optical path. Based on the above prominent advantages, a continuous measurement system of atmospheric aerosol extinction coefficient using the CAPS is developed. The cavity reflectivity of the system is about 0.9999, and the corresponding effective optical path of 4.4 km is calculated. Based on the analysis of Allan variance, the best integration time of the system is 80 s, and the corresponding extreme value of extinction coefficient detection is 0.06 Mm-1. The CAPS system is applied to the 12 cycles and 48-hour continuous monitoring for atmospheric aerosol extinction coefficient. The result shows that the empty cavity phase shift is basically stable, the cavity attenuated phase shift of the sample measurement is evident, and the retrieved atmospheric visibility is reliable. The above results suggest that the continuous measurement system of atmospheric aerosol extinction coefficient based on the CAPS can be used for practical atmospheric aerosol measurement.