Magnetohydrodynamic linear vibration sensor with runway type structure

Abstract

The invention discloses a magnetohydrodynamic linear vibration sensor with a runway type structure. A metal shell of the magnetohydrodynamic linear vibration sensor is composed of a base and an end cover. A groove is formed in the base. A C-shaped magnetic circuit, permanent magnets and a fluid channel are arranged in the shell. The C-shaped magnetic circuit surrounds the permanent magnets and thefluid channel. The permanent magnets are placed on the two sides of the outer plane of the fluid channel and located at the two ends of an opening of the C-shaped magnetic circuit. A fluid cavity isformed in the fluid channel, and the fluid cavity is filled with conductive fluid. A first electrode and a second electrode are arranged on the upper wall and the lower wall of the bottom straight channel section, being in contact with the permanent magnets, of the fluid channel. The magnetohydrodynamic linear vibration sensor with the runway type structure has the characteristics of wide frequency band, low noise, low power consumption, high reliability, small volume, light weight and long service life, and can stably work in severe environments such as strong impact.

Description

technical field [0001] The invention relates to the field of magnetohydrodynamics, in particular to a magnetohydrodynamic linear vibration sensor based on a racetrack structure. Background technique [0002] At present, aerospace technology is an important criterion for measuring the development level of a country, and the analysis and design of the mechanical and environmental conditions of spacecraft is currently the bottleneck technology that restricts the improvement of the overall design level of my country's spacecraft. The mechanical environment of a spacecraft refers to the environment such as vibration, acceleration, noise and microgravity experienced by the spacecraft during its operation. Therefore, the wide-band, low-noise linear vibration sensor can be used to meet the needs of spacecraft wide-band high-precision mechanical environment testing. [0003] At present, the commonly used spacecraft vibration sensors include piezoresistive linear vibration sensors an...

AI Technical Summary

Problems solved by technology

Among them, the piezoresistive vibration sensor is used for low-frequency vibration measurement, which has the problems of high noise and high temperature influence; the piezoelectric linear vibration sensor is used for high-frequency vibration measurement, and has low measurement accuracy and cannot measure static signals. question

Other vibration sensors, such as: quartz flexible vibration sensors are susceptible to unstable measurement due to environmental factors such as time and temperature; electrostatic vibration sensors based on the principle of electrostatic suspension have narrow bandwidth and long production cycle; vibration beams based on the principle of mechanical resonance The sensor has a "frequency locking" problem caused by mechanical coupling effects

Images