Contact measuring device for determining the dry film thickness of a paint on a conductive primer adhered to a plastic substrate
US5093626A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1990 |
| Grant date | Mar 3, 1992 |
| Priority date | — |
| Expiry date | May 11, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/085
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electrical device for measuring the dry film thickness of a paint film applied to a conductive coating adhered to a plastic substrate without destroying the film; the device contains the followintg components: a. an electric sensing device of two separate electrodes isolated from each other and positioned in a material capable of conforming to the surface of the film being measured where the sensing device is placed in contact with the surface of the film and measured under a uniform and reproducible pressure; b. a gain and phase measuring device electrically connected to the sensing device for measuring the gain and phase of an alternating current electrical signal passed from one electrode through the film and conductive coating to the second electrode; c. a device electrically associated with the gain and phase measuring device which measures the gain and phase signals of the overall circuit of the two electrodes, the paint film and conductive coating and from the gain and phase signals calculates the thickness of the paint film and the resistance of the conductive coating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.