Application research of micro water sensor based on quartz enhanced photoacoustic spectroscopy technology in power system
In SF6 insulated high-voltage gas power systems,H2 O is the most problematic impurity which not only decreases insulation performance but also creates an acidic atmosphere that promotes cor-rosion.Corrosion damages electrical equipment and leads to leaks,which pose serious safety hazards to people and the environment.A QEPAS-based sensor system for the sub-ppm level H2 O detection in SF6 buffer gas was developed by use of a near-infrared commercial Distributed Feedback(DFB)diode laser.Since the specific physical constants of SF6 are strongly different from that of N2 or air,the resonant frequency and Q-factor of the bare quartz tuning fork(QTF)had changed to 32,763 Hz and 4173,respectively.After the experimental optimization of acoustic micro-resonator(AmR)parameters,gas pressures,and modulation depths,a detection limit of 0.49 ppm was achieved for an averaging time of 1 s,which provided a powerful prevention tool for the safety monitoring in power systems.
quartz enhanced photoacoustic spectroscopytrace gas sensorhumidity sensor
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