A gas detection system based on FPGA is proposed,which realizes the miniaturization and digitalization of TDLAS gas measurement system. FPGA have good performance on parallel computing, easy to realize DDS and quadrature digital phase-locked which can be used to calculate the high frequency signal and the extraction of har-monic signal in the process of TDLAS measurement. The laser, the temperature control module, the current drive module,the signal generator,the photoelectric detector,the band-pass filter and the ADC sampling are integrated on the same printed circuit board to realize the miniaturization and integration of the system. Finally,the stability of the system is verified by monitoring the oxygen concentration in the air for a long time.%提出了基于FPGA的气体检测系统,实现了TDLAS气体测量系统小型化、数字化.利用FPGA并行计算、易于实现DDS信号发生和正交数字锁相等特点,可以满足TDLAS测量过程中的高频信号发生、谐波信号的提取等计算,从而采用正交数字锁相方法及拟合法实现气体的测量.将激光器、温度控制模块、电流驱动模块、信号发生器、光电探测器、带通滤波器、ADC采样集成在同一块印制电路板上,实现系统的小型化和集成化.最后,通过在空气中对氧气浓度进行长时监测,验证了本系统的稳定性.
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