ZHU Mingkuan, LI Xisheng, LÜ Zhen. Design of an embedded photoacoustic spectroscopy sensing system for trace gas detection[J]. 2026, 45(5): 131-136.DOI:
To address the application requirements for miniaturization and low cost in photoacoustic spectroscopy(PAS) trace gas detection systems
an embedded photoacoustic spectroscopy sensing system with STM32H743 as the core is designed.Laser temperature control
wavelength modulation
high-precision photoacoustic signal acquisition
and digital lock-in amplifier(DLIA) are integrated into a single microcontroller
achieving full-link digital integration from optical excitation to signal processing.Using acetylene gas as the detection sample
experimental results show that the system exhibits good response linearity (
R
2
=0.9982).Through Allan deviation analys
is
the minimum detection limit at the optimal integration time of 595s is 0.0186μL/L.This system ensures good detection performance while achieving high integration and low cost