|Table of Contents|

Real Time Compensation of Laser Detection System APD

《南京理工大学学报》（自然科学版）[ISSN:1005-9830/CN:32-1397/N]

Issue:
2010年06期
Page:
787-791
Research Field:
Publishing date:

Info

Title:
Real Time Compensation of Laser Detection System APD
Author(s):
FENG Ying; ZHANG He; ZHANG Xiang-jin; LIU Kun
ZNDY of Ministerial Key Laboratory,NUST,Nanjing 210094,China
Keywords:
laser detection system;  avalanche photo diode;  real time compensation;  noise compensation;  temperature compensation
PACS:
TN247
DOI:
-
Abstract:
To solve the problem that the background radiation and operating temperature of laser detection system seriously affect the current gain and signal-noise-ratio(SNR)of avalanche photo diode(APD),the APD is compensated by using the noise transfer function of the laser receiver.The specific real-time compensation in real time on APD in various environments is presented by analyzing basic application circuit noise model of APD and operating principles of all compensations.A real-time compensation method is designed based on the on-off state of switch power switching tube.Comparative experiments are done on noise compensation and temperature compensation in different environments.The results show: in the laser detection system with constant environment operating temperature,the noise compensation has obvious inhibition effect to the APD output noise caused by the acute change of background light;when the illuminance of background light changes from 3 lx to 200 lx,the response time of bias changing from 132 V to 178 V is 10.4 ms;when the power background light is low and the environment temperature change is acute,the temperature compensation has obvious inhibition effect on the APD output noise,and the noise compensation has poor effect;when the environment temperature changes from-20 ℃ to 80 ℃,the response time of bias changing from 131 V to 198 V is 11.2 ms.

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Last Update: 2012-11-02