Non-contact wet or dry film thickness measuring device using edd

Details Non-contact wet or dry film thickness measuring device using edd Non-contact wet or dry film thickness measuring device using edd

1989-12-05

1991-11-05

Chapman, John E.

Measuring and testing

Vibration

By mechanical waves

324229, 324230, 324231, 364563, G01B 710

Patent

active

050622986

ABSTRACT:
A device for measuring the thickness of a wet or dry paint film applied on a substrate without contacting the film is disclosed. The device uses an ultrasonic sensor positioned adjacent to an inductive eddy-current proximity sensor where the ultrasonic sensor measures the distance between the device and the upper surface of the paint film and the proximity sensor measures the distance between the device and the upper surface of the substrate. The two distances measured, when compared, produce the film thickness value. The device is capable of accurately measuring thickness of various paint films, such as flat, glossy and metal-flake containing paint films.

REFERENCES:
patent: 3258686 (1966-06-01), Selgin
patent: 4567766 (1986-02-01), Seiferling
patent: 4614300 (1986-09-01), Falcoff
patent: 4702931 (1987-10-01), Falcoff
patent: 4814703 (1989-03-01), Carr et al.
patent: 4912410 (1990-03-01), Morley
NASA Tech. Briefs, May/Jun. 1986, pp. 94 and 96.
Cyber Optics Bulletin--1986.

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