Mass point vibration velocity sensor with wide response frequency band

Abstract

The invention relates to a mass point vibration velocity sensor with a wide response frequency band. The sensor comprises a sensitive unit and a signal processing unit, wherein the sensitive unit consists of a plurality of sensitive subunits, each sensitive subunit is used for collecting a sound signal of a corresponding frequency band, and the signal conditioning unit is used for amplifying electric signals outputted by the sensitive unit and synthesizing the electric signals outputted by the sensitive subunits. According to the sensor, broadband response can be realized on the premise of ensuring the signal-to-noise ratio and sensitivity.

Description

technical field [0001] The invention relates to a particle vibration velocity sensor with a wide response frequency band. Background technique [0002] The acoustic signal contains two parameter values, the scalar sound pressure signal and the vector particle velocity signal, which respectively reflect different characteristics of the sound field. Source location tracking, sound field imaging and other aspects have broad application prospects in various fields such as aeroacoustics and hydroacoustics. For scalar sound pressure signals, it can be measured by various sensors such as electret condenser microphones. For the acoustic vector signal, the traditional measurement method is generally based on the principle of sound pressure gradient for indirect measurement, that is, through the gradient calculation of the sound pressure detected by two microphones at a certain distance, the particle velocity signal is obtained. [0003] The prior art most relevant to the present in...

AI Technical Summary

Problems solved by technology

However, the performance characteristics of this type of particle vibration sensor, such as response frequency band, sensitivity, and signal-to-noise ratio, are limited by various factors such as the structural size of the thermal resistance wire, the spacing of the thermal resistance wire, and the material selected for the sensor.

Therefore, the current particle velocity sensor is difficult to achieve a wide response frequency band under the premise of ensuring the signal-to-noise ratio and sensitivity in the frequency band

This will cause a series of problems such as signal distortion and large noise in the frequency band when the sensor detects broadband sound signals

This defect directly affects the detection of broadband sound signals by the particle velocity sensor, which limits the application scenarios and scope of application of the particle velocity sensor

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