US EPA

2938815 

Journal Article 

Backscattered signal modulation and emitting module design for a cloud lidar 

Shu Xiaowen; Chen Zhenyi; Lian Xu; Jin Hui; Zhang Xiaofu 

2014 

Unk 

Proceedings of SPIE
ISSN: 0277-786X
EISSN: 1996-756X 

Proceedings of SPIE 

9142 

10.1117/12.2057303 

WOS:000334347800085 

The cloud lidar, with the character of high precision and good stability, is an effective way to detect the cloud height. Pulse diode laser (PLD), as an essential part of the lidar system, needs the triggering pulse. In this paper, the emitting part of the lidar is studied, including the simulation of the backscatter SNR, the choose of the PLD and the design of trigging circuit to drive the 905nm PLD with the consideration of the optical system. A circuit for trigging the laser pulse with adjustable power and pulse width is contrived. Then the software Systemview is used to emulate the design and finally the making of PCB is finished. The results show whatever the parameters of the pulse, namely trigging pulse width, the rising edge, dithering, all these can be qualified to be in use in the practice and enjoys the merits of the low cost and convenience. The emitting module operates well. 

lidar; Pulse diode laser; backscatter SNR; trigging circuit