All-weather low-frequency acoustic sensor

Abstract

The invention relates to an all-weather low-frequency acoustic sensor. The all-weather low-frequency acoustic sensor is technically characterized by comprising a front cavity, a rear cavity pipe and a pre-amplifier base, wherein a main body is mounted on the inner side of the front cavity; a sensing head is mounted at the upper end of the main body; the lower end of the main body and the rear cavity pipe are mounted together; the lower end of the rear cavity pipe and the pre-amplifier base are mounted together; a sound entry head is arranged in the middle of the upper part of the cavity wall of the front cavity; a pressure equalizing pipe which is used for communicating the front cavity with the rear cavity pipe is arranged on the main body; a signal output pole is arranged in the rear cavity pipe; a pre-amplifier circuit board is mounted in the pre-amplifier base; the signal output pole penetrates through the pre-amplifier base through a signal line and is connected to the pre-amplifier circuit board. The all-weather low-frequency acoustic sensor is reasonable in design, has the characteristics of simple structure, high sensitivity, high performance stability, easiness in use and the like, is insensitive to temperature and humidity, can resist high temperature, high humidity and impact, can stably work in a changeable environment with severe temperature and humidity, and resists impact vibration in a transporting process.

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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