A comprehensive dual-spectroscopy detection technique based on tunable diode laser absorption spectroscopy (TDLAS) and quartz enhanced photoacoustic spectroscopy (QEPAS) is demonstrated using a single quartz tuning fork (QTF) for signal detection. The QTF was utilized as an acoustic wave transducer for QEPAS signal detection. The QTF also served as a photoelectric detector for TDLAS signal detection based on the thermoelastic effect. The dual-spectroscopy detection structure was designed for TDLAS and QEPAS detection. The on-beam acoustic micro resonator (AMR) structure was placed on the upper end of the QTF for QEPAS signal enhancement, and the laser beam transmitted through the AMR was aligned to the QTF prong by an optical collimator for TDLAS signal detection. An absorption gas cell with an optical path length of 3 m was utilized in the TDLAS setup. The gas cell enhanced the absorption signal of the gas by virtue of its relatively long optical path. We tested the feasibility of the proposed dual-spectroscopy detection technique by detecting acetylene (C₂H₂) at 1532.83 nm. The experimental show that the signal of the dual-spectroscopy detection technique is approximately 1.13 times that of the QEPAS signal. The proposed dual-spectroscopy detection technique also showed superior gas sensing capability for trace gas detection and could achieve a minimum detection limit of 1.05 ppm. The signal strength of the proposed dual-spectroscopy detection technique can be further enhanced by using an absorption gas cell with a longer optical path.

使用单个石英音叉 (QTF) 进行信号检测，展示了一种基于可调谐二极管激光吸收光谱 (TDLAS) 和石英增强光声光谱 (QEPAS) 的综合双光谱检测技术。QTF用作QEPAS信号检测的声波换能器。QTF 还用作基于热弹性效应的 TDLAS 信号检测的光电检测器。双光谱检测结构专为TDLAS和QEPAS检测而设计。束上声微谐振器 (AMR) 结构放置在 QTF 的上端用于 QEPAS 信号增强，通过 AMR 传输的激光束通过光学准直器对准 QTF 插脚，用于 TDLAS 信号检测。在 TDLAS 设置中使用了光程长度为 3 m 的吸收气体池。气室凭借其相对较长的光路增强了气体的吸收信号。我们通过检测乙炔（C₂ H ₂ ) 在 1532.83 nm。实验表明，双光谱检测技术的信号约为QEPAS信号的1.13倍。所提出的双光谱检测技术还显示出对痕量气体检测的卓越气体传感能力，并且可以达到 1.05 ppm 的最低检测限。通过使用具有更长光路的吸收气体池，可以进一步增强所提出的双光谱检测技术的信号强度。