用于CO气体检测的近红外分布式反馈激光器温控系统

Development of Near Infrared Distributed Feedback Laser Temperature Control System for CO Detection

为保证分布反馈激光器在一氧化碳气体浓度检测中能满足长时间工作稳定性、输出波长随温度线性变化、温度调节快速响应等要求，设计并研制了一种分布反馈激光器温控系统。该系统采用数字信号处理器与数模转换芯片设定温度，利用热电制冷器控制芯片调节激光器温度，采用模拟比例积分微分（PID）算法完成激光器恒温控制。利用研制的温控系统，对用于红外一氧化碳气体检测、中心波长为1563.06 nm的分布反馈激光器开展了温度控制实验。结果表明，该控制系统控制精度优于±0.02 ℃，小幅度调温时响应时间小于8 s。在所研制的温控系统的作用下，激光器长时间工作时中心波长无漂移。

A distributed feedback laser temperature control system that is developed to guarantee the laser performance including long time working stability, linearity of wavelength to temperature and quick temperature modulation response to meet the requirements of CO concentration detection is presented. In this system, digital signal processor and digital analog converter are used to set temperature value, thermoelectric cooler controller is applied to perform the laser temperature modulation and analog proportion-integration-differential （PID） arithmetic is adopted to maintain the constant temperature. Temperature control experiments are carried out by using this system with a 1563.06 nm distributed feedback laser, which is developed for infrared CO detection. The results show that the system control precision is less than ±0.02 ℃ and response time of small scale temperature modulation is shorter than 8 seconds. Under the control of this system, the laser center wavelength does not shift even for a long time working period.