A cross-sectional self-inductance magnetic liquid micro-pressure differential sensor

Abstract

The invention provides a section-type self-inductance magnetic liquid micro differential pressure sensor. In the case of assembly, a magnetic conducting ring (6) is firstly fixed in the center of an organic glass tube (8), a left coil (5-1) and a right coil (5-2) are symmetrically wound on two sides of the magnetic conducting ring (6) and are provided with a left magnetic conducting sleeve (4-1) and a right magnetic conducting sleeve (4-2); then, a left cylindrical permanent magnet (2-1), a right cylindrical permanent magnet (2-2), a left aluminium bar (3-1), a right aluminium bar (3-2) and an iron core make up a composite magnetic core, a left magnetic liquid sealing ring (1-1) and a right magnetic liquid sealing ring (1-2) are attracted to the composite magnetic core and put in the organic glass tube (8); and finally, a left annular magnet (9-1) and a right annular magnet (9-2) are put at two ends of the organic glass tube (8). Under the effect of micro pressure, the composite magnetic core moves horizontally, the area between the cylindrical surface of the iron core (7) and opposite parts of the two ring surfaces where the left magnetic conducting sleeve (4-1) and the right magnetic conducting sleeve (4-2) are contacted with the organic glass tube (8) changes to enable inductance to be changed so as to output voltage signals. Signal outputted by the sensor is obvious, the free travel is adjustable, and assembly is convenient.

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] The measurement range of this kind of magnetic liquid micro-pressure difference senso...

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Problems solved by technology

[0003] The measurement range of this kind of magnetic liquid micro-pressure difference sensor is about 0Pa ~ 1000Pa, the measurement range is too small, it is greatly affected by the external environment, and the cost is high, the output signal is weak, and it cannot meet the needs of most micro-pressure measurements.

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