摘要
激光器的稳定性由于它的温度特性往往不能维持稳定,当温度迅速升高的情况下,二极管会产生许多非理想效应,如其输出功率呈抛物线下降。本文提出了一种典型且具有高精度的恒温控制系统。该系统通过热敏电阻收集温度信号,并依靠单片机搭建信号处理电路,使其对半导体制冷芯片LTC1923进行实时控制。最后,通过H桥电路驱动TEC实现其工作,从而调节激光二极管的温度。同时,为了能够进行远程控制激光器的工作温度,采用了单片机通过Wi-Fi与上位机连接,可以在上位机设定工作温度,实现了远程控制。最后能保证了激光器的工作温度的误差在±0.01℃以内。
The stability of laser diode （LD） is often limited due to its temperature characteristics.The defect can lead to a decrease of output power in a parabolic rate as well as other side effects when temperature rapidly goes up.To overcome this difficulty,the paper presents a typical constant temperature control system with high-accuracy.This system performs efficiently in constant temperature controlling.The temperature signal is collected by thermistors.Then the signal processing circuit controls the semiconductor cooling chip LTC1923 at real time.Then a H-bridge is used to drive the TEC so that the LD working temperature can be controlled accurately.At the same time,for remote control of the system,the MCU is connected to PC by WiFi on which the working temperature is set up.The maximum deviation of the temperature control is only ± 0.01 ℃.
出处
《实验室研究与探索》
CAS
北大核心
2014年第10期76-81,共6页
Research and Exploration In Laboratory
