摘要
提出了用来探测大气CO2 分布、基于光纤 1.6um波长的微脉冲激光雷达 ,对其性能进行了数值模拟 .微脉冲激光雷达的发射机以半导体激光器加光纤放大器为核心 ,饱和输出功率 37dBm ;接收机采用了近红外光电倍增管和光子计数器 ,量子效率 1% ;一种偏正无关性纤维光学环形器作为发射 /接收转换器 ,分波 /合波器、隔离器、滤波器、耦合器都采用光纤器件 ,使系统更牢固 .该系统的特点是发射脉冲能量低 2 0uJ、重复频率高 2 0KHz、小型化 .(18× 10 6个脉冲累加 )它对近地面 4 .7Km高度内的探测信噪比在 10∶1以上 .光电倍增管的暗计数 2× 10 5/s限制了系统探测距离的增加 .吸收倍增分离的InGaAs/Si雪崩光电二极管将会改善雷达的性能 .
1.6um-wave length, fiber-based micro pulse lidar of profiling atmospheric CO2 was designed, The performance of this lidar was simulated. The transmitter of micro pulse lidar is based on semiconductor laser plus erbium-doped fiber amplifier with a saturated output power of 37dBm. The receiver employs photon counter and near infrared photomultiplier tube with quantum efficiency of 1%. A polarization-independent fiber-optic circulator is used as the transmit -receive switch. The system utilizes fiber devices for almost all components, e. g. wavelength-division -multiplexers/demultiplexers, isolator, filter, coupler, which make the system robust. Characteristic of this lidar is micro pulse energy 20uJ, high repetition rate of 20kHz and miniaturization. Signal simulations indicate that signal-to-noise ratio below 4. 7km is more than 10:1 ( 18 X 106 pulse). Anode dark count of 2 x 10(5)/s limits the system performance. New InGaAs/Si APD with separate absorption and multiplication region will improve the lidar performance.
出处
《红外与毫米波学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第5期384-388,共5页
Journal of Infrared and Millimeter Waves
基金
8 63 -13主题课题车载激光测污雷达关键技术资助项目 ( 2 0 0 2AA 13 5 0 3 0 )
