Electret noise sensor for spacecraft noise measurement

A technology for aerospace vehicles and noise sensors, applied in the field of aerospace sensors, can solve the problems of large shock vibration temperature variation range, noise sensors can not meet the needs of aircraft noise measurement, etc., to achieve strong damage resistance, wide application range, stable and reliable installation Effect

Active Publication Date: 2018-10-12
BEIJING RES INST OF TELEMETRY +1
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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

Method used

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  • Electret noise sensor for spacecraft noise measurement
  • Electret noise sensor for spacecraft noise measurement
  • Electret noise sensor for spacecraft noise measurement

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Embodiment

[0061] The thermistor 14 used by the electret noise sensor is MF17 negative temperature thermistor, the high-value resistor 15 is RI42 resistor, the high-impedance composite tube 16 is TD480C, the matching housing 20, the tailstock 17, and the tail cover 19 All are made of stainless steel. The conductive spring 10 is made of beryllium bronze wire, modulated after molding, and the surface is plated with gold. It has good mechanical properties, weldability, and good electrical conductivity. The conductive spring is soldered to the conductive rod 11 . The upper insulating seat 12 and the lower insulating seat 13 are all made of polytetrafluoroethylene, and the upper insulating seat 12 has two installation holes, which are respectively used for installing the thermistor 14 and the high value resistor 15, and the lower insulating seat 13 is used for installing the high Impedance composite tube 16, according to the schematic diagram of the circuit, each device is soldered and connec...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H11/06
CPCG01H11/06
Inventor 张永强何勤何真顾根妹
Owner BEIJING RES INST OF TELEMETRY
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