研制了一种板级多通道半导体激光器温控系统,将其应用于混合气体检测中可实现同时对多个半导体激光器温度的控制。该系统硬件上由多通道温度采集模块、数字信号处理器模块、半导体制冷器(TEC)和TEC控制模块组成。软件上采用时间片轮转调度算法和积分分离式数字比例积分微分算法,实现了对多个半导体激光器温度的实时、精确控制。为了测试系统的性能,利用该系统同时控制中心波长为1.65 μm和1.56 μm的可调谐分布反馈激光器的温度,进行了温度控制实验并测试了两个激光器的发光光谱。实验结果表明,该系统可以实现对两个激光器温度的同时控制,温控精度为-0.011~0.015 ℃,响应时间小于3 s。对温控系统的工作稳定性进行了测试,两个激光器连续工作6 h,其工作温度保持恒定。连续10 h测试两个激光器的输出光谱,输出波长的峰值未出现偏移。该温控系统体积小、成本低、便于集成且稳定可靠,在混合气体检测中有良好的应用前景。

A semiconductor laser temperature control system with board-level multi-channel is developed to control the temperature of multiple semiconductor lasers simultaneously in the detection of mixed gas. The system consists of multi-channel temperature acquisition module, digital signal processor module, thermoelectric cooler (TEC) and TEC control modules. The round-robin scheduling algorithm and integration-separated digital proportional integral differential algorithm are used to precisely control the temperature of multiple semiconductor lasers in real time. Temperatures of both the wavelength-tunable distributed feedback lasers centered at 1.65 μm and 1.56 μm are controlled when we use the proposed system. The temperature control experiment is carried out, and the luminescent spectra of the two lasers are detected. Results show that the system can control the temperatures of the two lasers simultaneously. The accuracy of this system can reach -0.011-0.015 ℃ and the response time is less than 3 s. The stability of the temperature controller is tested. The temperatures of the two lasers can stay stable after operation for 6 h, and the emitting peak wavelengths are stable in spectrum test for 10 h. For its tiny size, low cost, capability to be integrated, great stability as well as reliability, the temperature control system has great application prospect in mixed gas detection.