基于热电制冷器温控系统数学建模和参量辨识

为了实现对半导体激光器温度的高精度控制,利用热电制冷器、温度传感器与相应的散热装置,设计了一套半导体激光器温度控制的实验系统.首先采用热力学分析方法,对实验系统进行了理论分析,建立了该温控实验系统数学模型与相应的传递函数;其次,在取得了半导体激光器温度数据的条件下,根据模型参量的特点,提出了一种结合阶跃响应的实验曲线,应用非线性曲线最小二乘拟合进行模型参量的辨识;最后利用该模型参量进行了系统仿真和实验验证.结果表明,仿真曲线、拟合曲线与实验曲线结果一致,拟合的模型参量具有较高的预测精度.这些结果对优化调整温度控制实验是有帮助的.

Mathematical modeling and parameter identification of temperature control systems based on thermoelectric coolers

In order to achieve high precision temperature control of a semiconductor laser, an experimental temperature control system was designed by using a thermoelectric cooler, a temperature sensor and corresponding radiators. Firstly, the mathematical model and the corresponding transfer function of temperature control were established by utilizing thermodynamic analysis method after theoretical analysis. Secondly, after obtaining the temperature data of the semiconductor laser, according to the characteristics of model parameters, an empirical curve of step response was presented and model parameters were identified by nonlinear curve least square fitting. Finally, the system was simulated based on the model parameters and experimental verification was carried out. The results show that the fitting curve and emulation curve is consistent with experimental curve and the fitting model parameters have better prediction accuracy. The result is helpful for optimizing temperature control.