Trace gas detection based on off-beam quartz enhanced photoacoustic spectroscopy: Optimization and performance evaluation

摘要

A gas sensor based on off-beam quartz enhanced photoacoustic spectroscopy was developed and optimized. Specifically, the length and diameter of the microresonator tube were optimized, and the outer tube shape is modified for enhancing the trace gas detection sensitivity. The impact of the distance between the quartz tuning fork and an acoustic microresonator on the sensor performance was experimentally investigated. The sensor performance was evaluated by determining the detection sensitivity to H2O vapor in ambient air at normal atmospheric pressure. A normalized noise equivalent absorption coefficient (1σ) of 6.2×10−9 cm−1 W/Hz1/2 was achieved. © 2010 American Institute of Physics Article Outline INTRODUCTION OB-QEPAS SENSOR CONFIGURATION SENSOR OPTIMIZATION SENSOR PERFORMANCE EVALUATION CONCLUSIONS