基于Zynq的TDLAS激光器温度控制系统研究

Research on temperature control system of TDLAS laser based on Zynq

针对使用TDLAS技术检测CO_(2)气体,本文设计了基于Zynq的激光器温控系统。系统选用XILINX-7000系列XC7Z020芯片作为主控单元,利用其独特的PS(Processing System)和PL(Programmable Logic)架构,使用PS端的FPU(floating point unit)进行浮点数据运算,通过Block RAM共享片内数据缓存,使得PL端可以直接获取PS端数据并进行高速PID运算。主控单元通过驱动AD7124-4芯片获得激光器的实时运行温度,将实际温度与目标温度进行高速PID运算后得到TEC驱动信号,改变TEC芯片LT8722的输出电压值,实现对激光器温度的动态调节。经过实际测试,该系统可以稳定、高速的对激光器进行温度控制,控温精度可达到±0.01℃。

For the detection of CO_(2)gas using TDLAS technology,this paper designs a laser temperature control system based on Zynq.The system selects XILINX-7000 series XC7Z020 chip as the main control unit,utilizes its unique PS(Processing System)and PL(Programmable Logic)architecture,uses the FPU(floating point unit)at the end of the PS to carry out floating-point data operation,and shares the on-chip data cache via Block By sharing the on-chip data cache through Block RAM,the PL side can directly obtain the data from the PS side and perform highspeed PID operations.The master control unit obtains the real-time operating temperature of the laser by driving the AD7124-4 chip,and then obtains the TEC drive signal after high-speed PID operation between the actual temperature and the target temperature,and changes the output voltage value of the TEC chip LT8722 to realize the dynamic adjustment of the laser temperature.After actual testing,the system can be stable,high-speed temperature control of the laser,temperature control accuracy of±0.01℃.