Anti-high voltage electric vortex shift sensor

A displacement sensor, high-voltage technology, applied in the field of non-electrical measurement, can solve the problems of cumbersome initial calibration of the sensor, increase the probe volume, small linear range, etc., achieve small resistance, strong anti-interference ability, and expand the linear range. Effect

Inactive Publication Date: 2005-03-02
ZHEJIANG UNIV +1
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  • Abstract
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Problems solved by technology

It has the advantages of high sensitivity, non-contact measurement, and high frequency response; however, its disadvantage is that the linear range is small and the range is limited; when measuring a large range, it is necessary to increase the volume of the probe, which brings great inconvenience to the application; and the initial sensor Calibration is more cumbersome

Method used

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  • Anti-high voltage electric vortex shift sensor

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with drawings and embodiments.

[0016] As shown in the drawings, the present invention comprises a shell 1, a frame 3 wound with an induction coil 2, and a short-circuit ring 4 installed in the frame 3. An inner shell 5 is installed between the short-circuit ring 4 and the frame 3; the inner shell 5 is made of high-voltage resistant non-magnetic material such as non-magnetic stainless steel; the outer shell 1 is made of soft magnetic material such as electrical pure iron; the induction coil 2. The high-strength enamelled copper wire is used for flat winding; the short-circuit ring 4 is made of conductive materials such as copper; the shell 1 can be spliced ​​in pieces. The short-circuit ring 4 can be connected with the spool 8 by threads or the like.

[0017] The pressure fluid Ps passes through the valve port and enters the P cavity, and the pressure of the P cavity can reach 32MPa; the inner shell ...

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Abstract

The invention discloses a withstand high voltage eddy current displacement sensor comprising shell, skeleton winded with induction coil and short circuit ring with inner casing between them, inner shell is made of withstand high voltage nonpermeametion material and outer shell of soft magnetic material, induction coil winded by high strength wire is used to measure dynamic or static displacement. It has wide measuring range, good linearity, high mechanical strength and thermal stability, wide frequency response, extending limitation of traditional eddy current displacement sensor, so can be widely used in displacement measurement of valve core or hydraulic cylinder piston under high voltage.

Description

technical field [0001] The invention relates to the technical field of non-electric quantity measurement, in particular to a high-voltage eddy current displacement sensor. Background technique [0002] The traditional eddy current displacement sensor uses an induction coil as a probe, and a high-frequency alternating current is passed into the coil to generate an alternating magnetic field. And the strength of the eddy current effect changes with the change of the relative position between the measuring object and the high-frequency probe; thus causing the change of the parameters of the induction coil, and obtaining the corresponding displacement signal through the subsequent processing circuit. It has the advantages of high sensitivity, non-contact measurement, and high frequency response; however, its disadvantage is that the linear range is small and the range is limited; when measuring a large range, it is necessary to increase the volume of the probe, which brings grea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/02G01D5/12
Inventor 丁凡李其朋翁振涛毕晴春
Owner ZHEJIANG UNIV
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