High-sensitivity magnetic liquid micro-pressure difference sensor

A micro differential pressure sensor, magnetic liquid technology, applied in pressure difference measurement between multiple valves, measurement of fluid pressure, instruments, etc., can solve the problems of low sensitivity and easy to produce errors.

Inactive Publication Date: 2013-06-19
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the sensitivity of the experimental device is low, and errors are prone to occur.

Method used

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Embodiment Construction

[0017] The present invention will be further described with accompanying drawing as specific embodiment:

[0018] A magnetic liquid micro pressure difference sensor with high sensitivity, the device includes: a left arm coil 1-1, a right arm coil 1-2, a first permanent magnet 2-1, a second permanent magnet 2-2, a magnetic liquid 3, U-shaped plexiglass tube 4, rubber plug 5, pressure gauge 6, first sliding rheostat R1, second sliding rheostat R2, AC power supply U and voltmeter V.

[0019] The high-strength enamelled copper wire is wound on the two arms of the U-shaped plexiglass tube evenly, symmetrically, and with equal turns to form the left arm coil 1-1 and the right arm coil 1-2, which are injected into the U-shaped plexiglass tube 4 The magnetic liquid 3 and the rubber stopper 5 are plugged in the upper opening of the left arm of the U-shaped plexiglass tube 4, and the side opening end of the left arm of the U-shaped plexiglass tube 4 is connected with the pressure source...

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Abstract

A high-sensitivity magnetic liquid micro-pressure difference sensor is applicable to the field of micro-pressure measurement and comprises a left arm coil (1-1), a right arm coil (1-2), a first permanent magnet (2-1), a second permanent magnet (2-2), magnetic liquid (3), a U-shaped organic glass tube (4), a rubber plug (5), a pressure gauge (6), a first slide rheostat (R1), a second slide rheostat (R2), an alternating current power supply (U) and a voltmeter (V). Copper wires are uniformly and symmetrically wound on two arms of a U-shaped tube, serially connected with the first slide rheostat (R1) and the second slide rheostat (R2) and then parallelly connected to two ends of the alternating current power supply. The magnetic liquid is poured into the U-shaped tube, two magnets are placed into two arm tubes of the U-shaped tube, the rubber plug is plugged into the U-shaped tube, and an open end of a left arm of the U-shaped tube is connected with a pressure source P and the pressure gauge. Under the action of micro-pressure, the permanent magnets move in the U-shaped tube along with the magnetic liquid, and the sensitivity of the magnetic liquid micro-pressure difference sensor is greatly improved under remarkable differential action as magnetic conductivity of the permanent magnets is far higher than that of the magnetic liquid.

Description

technical field [0001] The invention belongs to a magnetic liquid micro-pressure difference sensor, and is particularly suitable for the field of micro-pressure difference measurement. Background technique [0002] At present, the research on the magnetic liquid micro-pressure difference sensor in our country is still in the experimental stage. The principle is as follows: the U-shaped plexiglass tube is equipped with a magnetic liquid, the two arms are wound with a coil and connected to an alternating current, and the external circuit resistance forms a bridge circuit. When the difference is applied, the liquid level of the two arms of the U-shaped plexiglass tube produces a height difference, and then the coil inductance L changes, and the balance of the bridge is destroyed. The voltage change measured by the external circuit is used to obtain the pressure difference change. [0003] Since the relative magnetic permeability of the magnetic liquid is about 1.2 (air is 1), t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L13/04
Inventor 李德才谢君
Owner BEIJING JIAOTONG UNIV
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