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Non-conducting medium film thickness online detecting device of coplane capacitive sensor

A technology of capacitive sensor and dielectric film, which is applied in electromagnetic measurement devices, electric/magnetic thickness measurement, etc., can solve the problems of small measurement thickness and human injury.

Active Publication Date: 2013-03-27
SHANDONG JIANZHU UNIV +2
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  • Claims
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Problems solved by technology

At present, the online measurement technology of non-conductive dielectric films in China mainly uses X-ray measurement, which is easy to cause harm to the human body; Germany relies on the capacitive edge effect to realize the thickness measurement of non-conductive dielectric films, but the measured thickness is very small, within 200 microns, which cannot meet the requirements

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  • Non-conducting medium film thickness online detecting device of coplane capacitive sensor
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  • Non-conducting medium film thickness online detecting device of coplane capacitive sensor

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Embodiment Construction

[0031] 1. Measuring principle

[0032] The form of capacitive non-conductive medium film thickness sensor used in this project is derived from the deformation of flat capacitive structure, which is a coplanar capacitive sensor. Coplanar capacitive sensors place two measuring electrodes of a common parallel plate capacitor in the same plane in the form of concentric rings. Capacitance is formed between two effective measuring electrodes, effective electrode 1 and effective electrode 2, and the electric field lines connect the two electrode surfaces in a chrysanthemum shape, such as figure 1 shown. The measurement surface of the sensor is formed below the plane where the two active electrodes are located. When the measured plastic mold 5 was placed on the measuring surface, the dielectric constant of the working area was changed by the dielectric constant of the air to the non-conductive dielectric film. becomes air permittivity and film dielectric constant Combination, ...

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Abstract

The invention discloses a non-conducting medium film thickness online detecting device of a coplane capacitive sensor. The non-conducting medium film thickness online detecting device comprises a detecting circuit, a data collecting card, an interface converter and a computer. The detecting circuit comprises a measuring exciting circuit, a reference capacitor, a main amplifier, a sensor measuring capacitor, a signal demodulator circuit, a signal separating circuit and a correcting amplifying circuit. The non-conducting medium film thickness online detecting device has the advantages of being good in adaptability, free of radial pollution, good in dynamic response, capable of achieving non-contact measuring, small in self temperature coefficient and the like and has wide application in online measuring of the non-conducting medium film thickness.

Description

technical field [0001] The invention relates to the field of thickness detection of plastic films, in particular to an on-line detection device for the thickness of a non-conductive medium film by using a coplanar capacitance sensor. Background technique [0002] In the plastic film manufacturing industry, thickness is the most important physical index. The uniformity of film thickness is directly related to product performance, grade rate, price and enterprise benefit. The uneven thickness directly affects the quality of the product. For POF packaging films, such as packaging films for tableware, it is easier to break when the thin part is heated and shrunk; for coated films, such as greenhouse films (PVC polyvinyl chloride), its surface will be coated A layer of anti-fogging agent, uneven thickness of the film will cause uneven thickness of the coating and reduce the service life of the film. The research and development of online thickness detection system for film ...

Claims

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Application Information

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IPC IPC(8): G01B7/06
Inventor 李红民马玉真郑媛
Owner SHANDONG JIANZHU UNIV
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