基于微弱光信号检测的光功率计  

Optical Power Meter Design Based on Weak Signal Detection

作　　者：廖平[1] 许伟坚[1] LIAO Ping XU Wei-jian(State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China)

机构地区：[1]中南大学机电工程学院高性能复杂制造国家重点实验室,湖南长沙410083

出　　处：《仪表技术与传感器》2017年第7期32-35,共4页Instrument Technique and Sensor

摘　　要：介绍了一种用于微弱光信号检测的光功率计的设计原理和实现方法。该光功率计以STM32为微控制器,使用InaGaAs-PIN光电探测器来实现光电转换,利用高速对数转换器ADL5304芯片实现高精度、宽范围的光电转换。同时采用24位的模数转换器ADS1246来实现很高的测量分辨率。实际测试结果表明:该功率计测量精度高,稳定性好,其检测下限达到-90dBm,可以检测光电流为pA级别的微弱光信号。The design principle and method of weak optical power meter used for signal detection was designed. With the STM32 microcontroller, the power meter used InGaAs-PIN photodetector to achieve photoelectric conversion, the ADL5304 chip was used to achieve high accuracy and wide range of photoelectric conversion.At the same time , 24-bit ADC ADS1246 was used to achieve high measurement resolution.The actual test results show that：the power meter has high accuracy, good stability, and its detection limit reached -90dBm, photoeurrent with pA level weak optical signal can be detected.

关 键 词：微弱光信号 ADL5304对数放大器 STM32 InaGaAs-PIN 

分 类 号：TH89[机械工程—仪器科学与技术]