An Electret Noise Sensor for Aerospace Vehicle Noise Measurement

Abstract

The invention provides an electret noise sensor for spacecraft noise measurement. The electret noise sensor for spacecraft noise measurement is composed of a microphone and an impedance matcher, wherein the microphone is an electret capacitor microphone; the impedance matcher is mainly composed of a temperature compensating resistor, a high value resistor, a high impedance composite tube, a powersupply and signal output connector, and a structural member; and the impedance matcher is used for performing impedance transformation on a signal output from the microphone. The electret noise sensorfor spacecraft noise measurement has wide temperature range, strong anti-damage capability, and smaller vibration sensitivity, can be used for measuring high sound intensity noise, and is suitable for various environmental conditions, such as different height. The electret noise sensor for spacecraft noise measurement is mainly used to measure noise parameters in an aircraft cabin or other severeenvironments.

Description

technical field [0001] The invention relates to an electret noise sensor for aerospace vehicle noise measurement, which is mainly used for measuring noise parameters in the cabin of the aircraft or in other harsh environments, and belongs to the field of aerospace sensors. Background technique [0002] During the flight of the aircraft, the vibration of the structure is caused by the excitation of the engine, the separation of the stages, etc., and the strong and continuous vibration will produce a large noise. In order to determine the noise environment on the bomb, in order to provide the basis for the aircraft structure design and the conditions of the instrument and equipment test, the noise environment on the bomb must be measured, and the measurement results are also an important basis for failure analysis. The essence of noise is vibration. In some occasions where it is difficult to directly measure vibration, noise measurement can reflect the vibration state of the t...

AI Technical Summary

Problems solved by technology

[0003] The aircraft will generate a lot of noise during flight, and the sound pressure level of the measured noise can often reach 170dB. At the same time, due to the changes in air pressure, temperature, and large vibration and impact levels during the flight, the measurement of noise parameters is faced with low air pressure, In severe environments such as large shock vibration and large temperature range, conventional noise sensors cannot meet the needs of aircraft noise measurement

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