A Particle Velocity Sensor with Wide Response Band

Abstract

The invention relates to a particle vibration velocity sensor with a wide response frequency band, which includes a sensitive unit, the sensitive unit is composed of a plurality of sensitive subunits, and each sensitive subunit is used to collect sound signals of corresponding frequency bands; it includes a signal conditioning unit, the The signal conditioning unit is used for amplifying the electrical signal output by the sensitive unit, and synthesizing the electrical signal output by each sensitive sub-unit. The invention can realize broadband response under the premise of ensuring signal-to-noise ratio and sensitivity.

Description

technical field [0001] The invention relates to a mass point 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 vibration velocity signal, which respectively reflect the different characteristics of the sound field. Source location tracking, sound field imaging and other aspects have broad application prospects in aeroacoustics, hydroacoustics and other fields. For the scalar sound pressure signal, it can be measured by a variety of sensors such as electret condenser microphones. For the sound vector signal, the traditional measurement method is generally based on the principle of sound pressure gradient for indirect measurement, that is, the gradient calculation is performed by the sound pressure detected by two microphones at a certain distance, so as to obtain the particle vibration velocity signal. [0003] The prior art ...

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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