摘要
研究和设计了探测大气CO2浓度的Raman激光雷达,其发射机采用Nd:YAG激光的三倍频 354．7 nm作为工作波长,发射的单脉冲能量60 mJ,重复频率20 Hz;接收机采用了光电倍增管(量子效率 25％)和光子计数器(计数速率200 MHz),探测CO2的Raman散射371．66 nm(频移1285 cm-1)信号, 采用组合滤光片来抑制强的354．7 nm Mie-Rayleigh后向散射和氧气Raman后向散射375．4 nm对信号的严重干扰。主要采取排除法,检验其他波段的辐射是否被截止,实验证明回波主要是371．66 nm辐射。O2的干扰大约为CO2信号的1％。
The design and experiment of a Raman lidar system for measurement of atmospheric CO2 are presented. 354.7 nm third harmonic of Nd：YAG laser is transmitted with 60 mJ pulse energy and repetition rate of 20 Hz. Receiver employed photomultiplier tube with quantum efficiency of 25% and 200 MHz photon counter, and it detects Raman backscattering signal 371.66 nm （shift 1285 cm^-1） from CO2. Combinatorial filter is used to reject interference presented by 354.7 nm intense Mie-Rayleigh backscattering and 375.4 nm Raman backscattering from O2 . Other wavelength radiation was excluded to enter photomultiplier tub. The interference from O2 is approximately 1% of the anticipated CO2 signal.
出处
《量子电子学报》
CAS
CSCD
北大核心
2006年第3期360-364,共5页
Chinese Journal of Quantum Electronics
基金
国家863-13资助项目(2002AA135030)
