We report an FPGA-based method for joint resonant frequency tracking and amplitude calibration to mitigate temperature-induced measurement errors in photoacoustic gas sensing. By dynamically adjusting the modulation frequency in response to real-time temperature monitoring and applying a reference-based amplitude calibration function, the system significantly improves measurement accuracy and stability. Experimental results under dynamic temperature variations demonstrate a substantial reduction in concentration fluctuation and a 58.1% enhancement in sensitivity, with the minimum detection limit improved from 43 ppb to 18 ppb

Photoacoustic spectroscopy, Temperature compensation, FPGA, Frequency tracking