Piezoelectric type noise sensor

Abstract

The invention relates to a piezoelectric type noise sensor and belongs to the technical field of space sensors. The piezoelectric type noise sensor comprises a front cover, a film sheet, a sound sensitizing assembly, a vibration compensating assembly, a shell, a locking bolt, a back cover, a socket and a mounting flange, wherein the back cover is connected with the shell in an interference fit or welding manner; the socket is connected with the back cover through the interface fit or welding manner; and the mounting flange is connected with the shell through a thread or welding manner. According to the piezoelectric type noise sensor disclosed by the invention, in use, an external power supply is not needed, electronic components do not exist inside, the use temperature range is wide, and no limitation of the electronic components exist; and the sensor is manufactured from a high temperature resisting material, the internal electric connection utilizes a spot welding manner, and the sensor can work under the high temperature environment.

Description

technical field [0001] The invention relates to a piezoelectric noise sensor and belongs to the technical 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, and the aerodynamic force. 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 target. [0003] The interaction between the surface of the aircraft and the air during the flight will produce a large noi...

AI Technical Summary

Problems solved by technology

[0003] The interaction between the surface of the aircraft and the air during the flight will produce a large noise, but due to air friction, structural vibration and other reasons, the measurement of this noise parameter often faces a high temperature vibration environment; the measurement of the wake noise near the aircraft engine also faces a large The harsh environment of shock vibration and high temperature; in addition, changes in the altitude of the aircraft during flight will cause changes in air pressure, which has a greater impact on conventional noise sensors, especially capacitive sensors

Conventional noise sensors cannot meet the needs of aircraft noise measurement

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