An air-gap self-inductive magnetic liquid micro-differential pressure sensor

Abstract

The invention discloses an air gap-type self-inductance magnetic liquid micro differential pressure sensor. In the case of assembly, firstly, a left E-type skeleton (4-1) on which a left coil (5-1) is wound and a right E-type skeleton (4-2) on which a right coil (5-2) is wound are fixed on a support, and a gap is left in the middle; then, a composite magnetic core attracting magnetic liquid and formed by a left cylindrical permanent magnet (2-1), a right cylindrical permanent magnet (2-2) and a horizontal iron core (3-1) is put in an organic glass tube (6), a left annular magnet (7-1) and a right annular magnet (7-2) are respectively stuffed at two ends of the organic glass tube (6), and a vertical iron core (3-2) and a horizontal iron core (3-1) are connected; and finally, the vertical iron core (3-2) is inserted in the gap between the left E-type skeleton (4-1) and the right E-type skeleton (4-2). Under the effect of micro pressure, the composite magnetic core moves horizontally, changes of gaps between the vertical iron core (3-2) and the left E-type skeleton and the right E-type skeleton cause inductance changes so as to further output voltage signals. The sensor is strong in output signals and high in sensitivity.

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 surface of the two arms of the U-shaped plexiglass tube produces a height difference Δh, 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] This kind of magnetic liquid micro-pressure difference sensor is greatly affected by ...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention: In the field of micro-pressure measurement, the signal of the magnetic liquid micro-pressure difference sensor is weak and the sensitivity is low

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