多参数激光告警中光功率测量电路设计  

Design of optical power measurement circuit based on laser warning

作　　者：牛家麒 张瑞[1] 张卓奇 武振涛 王志斌[1] 李孟委 NIU Jiaqi;ZHANG Rui;ZHANG Zhuoqi;WU Zhentao;WANG Zhibin;LI Mengwei(Engineering and Technology Research Center of Shanxi Provincial for Optical-Electric Information and Instrument,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学山西省光电信息与仪器工程技术研究中心,太原030051

出　　处：《激光杂志》2024年第9期19-25,共7页Laser Journal

基　　金：国家自然科学基金(No.62105302);山西省基础研究计划(No.20210302124269)。

摘　　要：为了实现多参数激光告警中激光在不同波长、不同方向下光功率的准确测量,设计了一种光功率检测电路。该电路主要由光电探测模块和A/D采集模块两部分组成。光电探测模块由光电二极管和运放OPA2846组成,A/D采集模块是由AD9220模数转换电路和FPGA接口电路共同构成的。来袭的连续激光经过光电探测模块将光信号转化为电压信号,电压信号经过A/D采集模块后转换为数字信号,通过接口电路传到FPGA,FPGA再根据激光告警系统获得的来袭激光波长和方向对光功率进行修正和显示,同时用光功率计进行定量标记,在满足光电二极管的线性响应范围内,可得出光功率与采集到的电压值之间呈线性关系。在不使用外置光衰减片的条件下,该电路实现了不同入射角在400 nm~1700 nm光谱范围内、0~60 mW功率范围内对光功率的测量,与标准功率计测得的结果对比误差小于0.5 mW。In order to achieve accurate measurement of laser power at different wavelengths and directions in multi-parameter laser warning,an optical power detection circuit was designed.This circuit mainly consists of two parts:a photoelectric detection module and an A/D acquisition module.The photoelectric detection module consists of a photodiode and an operational amplifier OPA2846,while the A/D acquisition module is composed of an AD9220 analog-to-digital conversion circuit and an FPGA interface circuit.The incoming continuous laser is converted into a voltage signal through the photoelectric detection module.The voltage signal is converted into a digital signal through the A/D acquisition module and transmitted to the FPGA through an interface circuit.The FPGA then corrects and displays the optical power based on the wavelength and direction of the incoming laser obtained by the laser warning system,and quantitatively marks it with an optical power meter to meet the linear response range of the photodiode,It can be concluded that there is a linear relationship between the optical power and the collected voltage value.Under the condition of not using an external optical attenuator,this circuit achieves the measurement of optical power at different incident angles in the spectral range of 400 nm~1700 nm and the power range of 0~60 mW.Compared with the results measured by the power meter,the error is less than 0.5 mW.

关 键 词：光电二极管 OPA2846 AD9220 光功率计 

分 类 号：TN249[电子电信—物理电子学]