基于ADN8834的高精度DBR激光器温度自动控制系统  

High accuracy temperature control system of DBR laser based on ADN8834

作　　者：王青[1,2] 姚泽坤 张寅 胡涛[2,4] 王晨旭 吴中毅[1,2,4] 郭清乾 常严 杨晓冬 WANG Qing;YAO Ze-kun;ZHANG Yin;HU Tao;WANG Chen-xu;WU Zhong-yi;GUO Qing-qian;CHANG Yan;YANG Xiao-dong(School of Biomedical Engineering,University of Science and Technology of China,Hefei 230026,China;Suzhou Institute of Biomedical Engineering and Technology,Chinese Academy of Sciences,Suzhou 215163,China;School of Electronic and Information Engineering,Changchun University of Science and Technology,Changchun 130022,China;Jihua Laboratory,Foshan 528200,China;School of Medical Imaging,Xuzhou Medical University,Xuzhou 221004,China)

机构地区：[1]中国科学技术大学生物医学工程学院,安徽合肥230026 [2]中国科学院苏州生物工程技术研究所,江苏苏州215163 [3]长春理工大学电子信息工程学院,吉林长春130022 [4]季华实验室,广东佛山528200 [5]徐州医科大学医学影像学院,江苏徐州221004

出　　处：《液晶与显示》2023年第5期609-616,共8页Chinese Journal of Liquid Crystals and Displays

基　　金：季华实验室项目(No.X190131TD190);江苏省自然科学基金青年项目(No.BK20200215);苏州市基础研究试点项目(No.SJC2021024);中国科学院科研仪器设备研制项目(No.YJKYYQ20210051)。

摘　　要：对于高灵敏原子磁力计极弱磁测量,激光温度的精确稳定控制是一项必不可少的工作。激光温度不稳定会导致激光波长波动和漂移,从而降低原子磁力计的灵敏度。为了降低激光器温度波动对原子磁力计的影响,本文设计并实现了一个基于ADN8834温度控制芯片的高精度DBR激光器自动温度控制系统。首先,基于ADN8834和高精度模/数转换芯片LTC2377设计了温度反馈电路,成功采集到了与温度对应的模拟电压信号并将其转换为数字信号送入FPGA。然后,在FPGA中实现了增量式数字PID算法,自动计算温度控制信号。最后,设计了数/模转换电路将该温度控制信号转换为模拟信号传递给ADN8834,ADN8834输出加热或冷却信号来控制半导体热电制冷器,从而实现闭环温度自动控制。实验结果表明,当目标温度分别设定在20,25,30℃时,该温度自动控制系统的温度稳定性均在±0.005℃,测试DBR激光器输出波长稳定性范围为±2 pm。该激光器自动温度控制系统温度稳定性高,且操作方便,设计灵活,基本满足原子磁力计系统对激光温度控制器的要求。For the extremely weak magnetic field measurement of atomic magnetometers,the precise and stable control of laser temperature is an essential work.Laser temperature instability can lead to laser wavelength fluctuations and drift,thus reducing the sensitivity of atomic magnetometers.In order to reduce the influence of laser temperature fluctuation on atomic magnetometer,a high precision DBR laser automatic temperature control system based on ADN8834 temperature control chip is designed and implemented.Firstly,a temperature feedback circuit is designed based on ADN8834 and a high precise A/D converter chip LTC2377,so that the analog voltage signal corresponding to the temperature is successfully collected and converted into a digital signal and sent to the FPGA.Then,the incremental digital PID algorithm is implemented in FPGA to automatically calculate the temperature control signal.Then,a D/A converter circuit is designed to convert the temperature control signal into an analog signal and transmit it to ADN8834.Finally,ADN8834 outputs heating or cooling signals to control the semiconductor thermoelectric cooler,so as to realize closed-loop temperature automatic control.The experimental results show that the temperature stability of the automatic temperature control system is±0.005℃when the target temperature is set at 20,25,30℃,and the stability of output wavelength is±2 pm.This DBR laser automatic temperature control system has high temperature stability,convenient operation and flexible design,and basically meets the requirements of atomic magnetometer system for laser temperature control.

关 键 词：ADN8834 数字PID算法 温度控制 半导体热电制冷器 

分 类 号：TN249[电子电信—物理电子学] TM936.1[电气工程—电力电子与电力传动]