A compact and portable quartz-enhanced photoacoustic spectroscopy gas sensor was developed for four-component gas detection using two off-beam acoustic microresonators The two AMRs were placed in parallel on opposing sides of a quartz tuning fork for photoacoustic signal enhancement. Four distributed feedback (DFB) lasers were connected to the four ends of the two off-beam AMRs using a fiber collimator for photoacoustic signal excitation. Four-component gas sensing was achieved via time-division multiplexing of the distributed feedback laser driver currents. The four-component gas sensing scheme was used to detect acetylene (C₂H₂) at 1,532.83 nm, methane (CH₄) at 1,653.722 nm, water vapor (H₂O) at 1,368.597 nm and carbon dioxide (CO₂) at 1,577.787 nm for feasibility testing. Minimum detection limits of 3.6 ppmv for C₂H₂, 34.71 ppmv for CH₄, 1.09 ppmv for H₂O, and 341.18 ppmv for CO₂ were obtained, and the linear responses reached 0.9982, 0.9969, 0.99843 and 0.99591 for C₂H₂, CH₄, H₂O and CO₂, respectively, at 1.5 s intervals.

开发了一种紧凑的便携式石英增强型光声光谱气体传感器，使用两个离束声微谐振器进行四组分气体检测。两个AMR平行放置在石英音叉的相对侧，以增强光声信号。使用光纤准直仪将四个分布式反馈（DFB）激光器连接到两个离束AMR的四个末端，以进行光声信号激励。通过分布式反馈激光驱动器电流的时分多路复用实现了四组分气体传感。四组分气体传感方案用于检测1,532.83 nm的乙炔（C ₂ H ₂），1,653.722 nm的甲烷（CH ₄），1,368.597 nm的水蒸气（H ₂ O）和二氧化碳（CO₂）在1,577.787 nm处进行可行性测试。C ₂ H _2的最低检测限为3.6 ppmv，CH _4的最低检测限为34.71 ppmv，H ₂ O的最低检测限为1.09 ppmv，CO _2的最低检测限为341.18 ppmv ，并且C ₂ H的线性响应分别为0.9982、0.9969、0.99843和0.99591 ₂，CH ₄，H ₂ O和CO ₂的间隔分别为1.5 s。