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基于光纤法珀工作点稳定技术提出了一种适用于全光式石英增强型光声光谱(QEPAS)探测技术的光纤法珀解调系统。利用可调谐光纤激光器作为探测光源,采用法珀干涉光强的直流信号作为误差反馈信号,将工作点锁定在正交相位点上,提高光纤法珀系统的稳定性,从而提高了光声信号探测的准确性。将其应用于全光式石英增强型光声光谱气体探测系统,并在开放环境中完成了对水蒸气的探测实验,得到其归一化噪声等效吸收系数为1.81×10-7W(cm·Hz)。实验结果表明,相比于一般的全光式石英增强型光声光谱系统,该方法的探测灵敏度提高了1.2倍。
Based on the Fabry-Perot operating point stabilization technique, an optical Fabry-Perot demodulation system suitable for all-optical quartz enhanced photoacoustic spectroscopy (QEPAS) detection technology is proposed. The tunable fiber laser is used as the detection light source, and the DC signal with Faropp interference intensity is used as the error feedback signal to lock the working point to the quadrature phase point, which improves the stability of the optical Fabry-Perot system and improves the detection of photoacoustic signal Accuracy It was applied to the all-optical quartz enhanced photoacoustic spectroscopy gas detection system and the water vapor detection experiment was completed in an open environment. The normalized noise equivalent absorption coefficient was 1.81 × 10-7 W (cm · Hz). The experimental results show that the detection sensitivity of this method is improved by 1.2 times compared with the general all-optical quartz enhanced photoacoustic spectroscopy system.