Design of high-precision laser crystal temperature control system
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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