A kind of magnetic liquid micro-pressure sensor with Hall detection mode

Abstract

A magnetic liquid micropressure sensor using a Hall detection method belongs to the field of mechanical engineering surveying, and successfully solves the problem that an existing magnetic liquid micropressure sensor cannot be applied in engineering practice. The device includes a balancing cavity (1), a shell (2), a first permanent magnet (3), a holder (4), a Hall element (5), a Hall element installation support (6), a second permanent magnet (7), a magnetic liquid (8) and a pressure regulating valve (9), when a pressure difference exists in the outside world, a moving part moves in the shell, thereby changing the magnetic flux density of magnetic lines of force that vertically pass through the Hall element, and detecting an output voltage signal, and in a pressure range of under 1000Pa of a pressure sensor, the pressure difference and an output voltage value are in a linear relation.

Description

technical field [0001] The invention belongs to the field of magnetic liquid sensors and is suitable for micro-pressure measurement. Background technique [0002] Micro-pressure sensor technology is more and more widely used in various fields of national economy such as military industry, biomedicine, aerospace and so on. With the in-depth research of science and the continuous advancement of science and technology, the application field has higher and higher requirements for the sensitivity, linearity, reliability and resolution of micro-pressure sensors. At present, the research on the magnetic liquid micro-pressure sensor in our country is still in the experimental stage. There are two main structural forms, one is the U-shaped tube type, the principle is: the U-shaped glass tube is equipped with a magnetic liquid, and the two arms are wound with a coil and passed through. Enter the alternating current and connect with the external resistance to form a bridge circuit. Wh...

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is that the length, area and number of turns of the coil will affect the accuracy, linearity and sensitivity of the output voltage because the existing magnetic liquid micro-pressure sensor uses a coil winding method to detect the output voltage signal problems; and when there is no micro-pressure effect, due to various influencing factors of actual working conditions, it is often impossible to ensure that the moving parts are in a balanced position, so that the output voltage signal value will have a zero-point residual voltage, which will affect the accuracy of the output signal and Linearity, so that it cannot be effectively applied in engineering practice

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