可调谐半导体激光吸收光谱技术(TDLAS)具有高分辨率和高灵敏度等特性,目前广泛应用于痕量气体检测,便携式和可在线调试是其发展的趋势。由于FPGA 具有速度快,体积小,结构简单,抗干扰能力强,可在线调试和并行等方面的明显优势,TDLAS 痕量气体检测系统结合FPGA 技术具有良好的应用前景。本文主要研究信号产生、采集的FPGA 实现。由开放光路的连续观测实验可知,信号产生精度高、频率可高达10 kHz 而不失真,信号采集精度高,可靠稳定,优化传统的TDLAS 痕量气体检测系统,表明信号产生、采集的FPGA 实现可行,为TDLAS痕量气体检测系统基于FPGA 的实现奠定基础。

Tunable semiconductor laser absorption spectrum technology (TDLAS) has the characteristics such as high resolution and high sensitivity, currently widely used in trace gas detection, so portable and online debugging is the trend of its development. Because the FPGA has the obvious advantages of fast speed, small size, simple structure, strong anti-interference ability, online debugging, parallel and so on, combined with FPGA technology, TDLAS trace gas detection system will have a good application prospect. This paper mainly studies the signal generation and the signal acquisition based on FPGA. Continuous observation experiment in the open light path indicates that the signal is high precision and its frequency can be as high as 10 kHz without distortion, the acquisition is high precision, stable and reliable, optimizing the traditional TDLAS trace gas detection system. It can be seen that the FPGA implementation of signal generation and signal acquisition is feasible, which is an important step to the FPGA implementation of TDLAS trace gas detection system.