可调谐激光器高稳定性双闭环温控系统设计  

Design of double closed-loop temperature control system with high stability for tunable laser

作　　者：李永康 朱兴邦 朱云波 喻一凡 戴永寿[1] LI Yongkang;ZHU Xingbang;ZHU Yunbo;YU Yifan;DAI Yongshou(College of Oceanography and Space Informatics,China University of Petroleum(East China),Qingdao 266580,China;The 41st Institute of CETC,Qingdao 266555,China)

机构地区：[1]中国石油大学(华东)海洋与空间信息学院,山东青岛266580 [2]中国电子科技集团有限公司第四十一研究所,山东青岛266555

出　　处：《传感器与微系统》2024年第6期77-80,共4页Transducer and Microsystem Technologies

基　　金：国家自然科学基金资助项目(41974144)。

摘　　要：温度稳定性对可调谐激光器波长和功率的稳定性起着至关重要的作用,因此,本文设计并开发了一种可调谐激光器高稳定性双闭环温控系统。首先,为了精确测得激光器工作温度值,设计了一种压差测量电路,对非线性热敏电阻进行精确线性测量;其次,为了向半导体制冷器(TEC)输出稳定的控制电流,设计了一种线性控制的H桥驱动电路,消除了TEC工作电流受到的纹波干扰;再次,为了提高温控系统的抗干扰能力,设计了深度负反馈电路作为系统的内环控制;最后,为了实现温度的实时调节,应用位置式PID对系统进行外环控制。实际电路测试结果表明:设定温度在15~35℃范围内时,激光增益芯片2 h温控稳定度优于±0.005℃,能够满足可调谐激光器温度控制的高稳定性需求。Temperature stability plays an important role in the stability of wavelength and power of tunable lasers.Therefore,a dual closed-loop temperature control system with high stability for tunable lasers is designed and developed.Firstly,in order to accurately measure the operating temperature of the laser,a differential pressure measurement circuit is designed to accurately and linearly measure the nonlinear thermistor.Secondly,in order to output stable control current to the thermoelectric cooler(TEC),a linear control H-bridge driver circuit is designed to eliminate the ripple interference of TEC working current;Thirdly,in order to improve the anti-interference ability of the temperature control system,a deep negative feedback circuit is designed as the inner loop control of the system;Finally,in order to realize the real-time temperature regulation,position PID is used to control the outer loop of the system.The actual circuit test results show that the 2 h temperature control stability of the laser gain chip is better than±0.005℃when the set temperature is within the range of 15~35℃,which can meet the high stability requirements of the tunable laser temperature control.

关 键 词：可调谐激光器 半导体制冷器 双闭环温度控制 高稳定性 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]