摘要
固体激光器中的激光晶体的温度,会影响激光器的性能,例如功率稳定性和光斑的质量等.针对固体激光器中晶体的温度控制需求,设计了一个高精度温控系统.系统采用非平衡电桥配合热敏器件进行温度的采样,二阶有源低通滤波器滤除高频的噪声干扰,高精度ADC方案,提高了采样精度.两片半桥驱动芯片组成半导体制冷器(TEC)驱动电路,驱动能力强.通过改进型PID算法,增加响应速度,更快速精准调节TEC的工作电流,以实现高精度高稳定的温控效果.GD32F103RCT6 单片机作为控制核心搭建温控系统,实验结果表明,该系统可实现在设定温度±0.005℃范围内的稳定控制.
Abstract
The temperature of the laser crystal in a solid-state laser can affect the performance of the laser,such as power stability and spot quality.A high-precision temperature control system has been designed to meet the temper-ature control requirements of crystals in solid-state lasers.The system adopts a non-equilibrium bridge combined with thermal sensors for temperature sampling,a second-order active low-pass filter to filter out high-frequency noise in-terference,and a high-precision ADC scheme to improve sampling accuracy.Two half bridge driving chips form a semiconductor cooler(TEC)driving circuit,which has strong driving ability.By improving the PID algorithm,the re-sponse speed is increased,and the working current of TEC is adjusted more quickly and accurately to achieve high-precision and stable temperature control effects.The GD32F103RCT6 microcontroller is used as the control core to build a temperature control system.The experimental results show that the system can achieve stable control within the set temperature range of±0.005℃.
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