Method for measuring clearance between metal bodies by capacity sensor

A capacitive sensor and metal body technology, applied in the field of measurement, can solve the problems of low detection accuracy and slow detection speed, and achieve the effect of high detection accuracy and fast detection speed

Active Publication Date: 2009-03-04
NUCLEAR POWER INSTITUTE OF CHINA +1
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Problems solved by technology

However, these existing detection methods have their limit...

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  • Method for measuring clearance between metal bodies by capacity sensor

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Embodiment Construction

[0019] A method of utilizing a capacitive sensor to measure the gap between metal bodies of the present invention utilizes the principle of capacitive detection gap:

[0020] When the pole piece capacitive sensor is inserted into the gap between the two metal bodies, there is capacitance C1 between the sensor pole piece and the upper metal body, and there is capacitance C2 between the sensor pole piece and the lower metal body.

[0021] When two capacitors C1 and C2 are connected in series, the series capacitor C can be calculated by formula (1).

[0022] 1 / C=1 / C1+1 / C2 (1)

[0023] in

[0024] C1=εS / d1, C2=εS / d2 (2)

[0025] S: the area of ​​the pole pieces covering each other, m 2 ;

[0026] d1, d2: respectively the distance between C1 and C2 plates, m;

[0027] ε: The dielectric constant of the medium between pole pieces, F / m.

[0028] Put formula (2) into formula (1), then:

[0029] C=εS / (d1+d2) (3)

[0030] And d1+d2 is the gap d between the two metal bodies. It c...

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Abstract

The invention discloses a method of measuring the clearance between metallic bodies by using a capacitive sensor. The method adopts a plurality of preset metallic calibrated test pieces which are marked with the clearance between existing metallic bodies, and the capacitive sensor with a plain film type capacitance probe. The capacitive sensor comprises an insulated thin plain film and a metallic slice which is arranged on the lower end face of the thin plain film as a capacitance pile piece. The plain film type capacitance probe is inserted into the clearances of the metallic calibrated test pieces one after another to calibrate the one to one coincidence relation between the known clearances between metallic bodies and the test data of the capacitive sensor. In actual measurement, the calibrated coincidence relation and a linear computation mode are used to calculate the corresponding clearance value of actual measuring data, so that the measuring value of the clearances between metallic bodies is gained. Compared with the method adopting the prior technology, the method is characterized by quick detection speed and high detection precision.

Description

technical field [0001] The invention belongs to the field of measurement technology, in particular to a method for measuring the gap between metal bodies by using a capacitance sensor. Background technique [0002] Gap detection is widely used in aviation, textile, mechanical and electronic industry, nuclear industry and other fields. The detection of the gap between metal bodies is one of them. For example, in the assembly process of instruments and meters, there are some requirements for the installation gap between some metal components. If the gap does not meet the requirements, it may affect the instrument and meter. accuracy. The traditional gap detection usually uses calipers to measure, but if the gap is too small, it is obvious that the scale of the caliper cannot be marked. Therefore, the detection of small gaps is usually done by using plug gauges, that is, prepare multiple gauges with different Thickness gauges are tested by inserting the thickness gauges into ...

Claims

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Application Information

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IPC IPC(8): G01B7/14
Inventor 李冬林俊明杨帆唐月明邓凯彭小明高三杰许贵平
Owner NUCLEAR POWER INSTITUTE OF CHINA
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