An all-weather low frequency acoustic wave sensor

Abstract

The invention relates to an all-weather low-frequency acoustic wave sensor. Its technical characteristics are: it includes a front cavity, a rear cavity tube and a preamplifier base, a main body is installed inside the front cavity, a sensitive head is installed on the upper end of the main body, and the lower end of the main body is connected to the rear cavity. The tubes are installed together, and the lower end of the back cavity tube is installed together with the base of the preamplifier; there is a sound inlet head in the middle of the upper part of the front cavity wall, and a pressure equalizer for connecting the front cavity and the back cavity tube is provided on the main body. There is a signal output pole in the back cavity tube, and a preamplifier circuit board is installed in the preamplifier base, and the signal output pole passes through the preamplifier base through a signal line and is connected to the preamplifier circuit board superior. The invention is reasonable in design, has the characteristics of simple structure, high sensitivity, stable performance, easy to use, etc., and is not sensitive to temperature and humidity, can withstand high temperature and high humidity impact, and can work stably in environments with changeable environments and severe temperature and humidity. Resistant to shock and vibration during transportation.

Description

technical field [0001] The invention belongs to the technical field of low-frequency sound wave detection, in particular to an all-weather low-frequency sound wave sensor. Background technique [0002] Infrasound is a sound wave with a frequency below 20 Hz that cannot be heard by the human ear. The low-frequency acoustic wave sensor is a transducer device that converts low-frequency acoustic wave signals in the frequency range of 100Hz to 0.0001Hz into electrical signals. In the field of applications that need to obtain low-frequency sound wave signals, the array detection of low-frequency sound can be realized through the combination of multiple sensors. At present, low-frequency acoustic wave sensors commonly used in low-frequency acoustic detection include: bellows bellows type, micro-barometer type, moving coil type, electromagnetic wave Doppler type, and optical fiber type. The requirements for sensors in low-frequency sound detection are good environmental adaptabil...

AI Technical Summary

Problems solved by technology

The requirements for sensors in low-frequency sound detection are good environmental adaptability, stable sensitivity, wide and flat frequency response, good long-term working stability, strong anti-electromagnetic interference ability, high temperature and high humidity resistance, small size, light weight, impact and drop resistance etc., but the typical low-frequency acoustic wave sensors in the prior art do not meet these conditions at the same time

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