Academic Journal of Engineering and Technology Science, 2022, 5(13); doi: 10.25236/AJETS.2022.051302.
Jia Xu, Bingyi Zhang, Qiang Fu
Changcheng Institute of Measurement and Metrology, Beijing, China
Infrasound widely exists in nature and human activities, such as earthquakes, volcanic eruptions, mudslides, nuclear explosions, supersonic flight, weapons targeting. Infrasound has strong penetrating ability, long propagation distance, small attenuation, and is widely used in environmental monitoring, military fields, industrial production and other fields. The monitoring of infrasound sound pressure signal mainly depends on the infrasound sensor, and the accurate measurement of infrasound sound pressure mainly depends on the calibration of the infrasound sensor, and the accurate measurement of the infrasound sensor is the premise and guarantee of the application of the infrasound sensor. The most widely used in the calibration of infrasound sensors is the gas chamber pressure method. In the calibration of the gas chamber pressure method, the external environmental noise will interfere with the atmospheric pressure in the cavity of the infrasound generator, which will affect the waveform generated by the infrasound generator and produce interference and waveform distortion. In this paper, we focus on the differential noise reduction technique of infrasound generator to reduce the interference generated by the infrasound motion in atmospheric pressure through structural design and sensor feedback control. It is verified that the atmospheric pressure fluctuation within 50s can be reduced from ±2Pa to ±0.2Pa, which significantly reduces the interference generated by the atmospheric pressure fluctuation in the environment.
Infrasound, Calibration, Differential, Noise reduction
Jia Xu, Bingyi Zhang, Qiang Fu. Study on Differential Noise Reduction Technique in Infrasound Calibration. Academic Journal of Engineering and Technology Science (2022) Vol. 5, Issue 13: 10-14. https://doi.org/10.25236/AJETS.2022.051302.
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