Non-contact wet or dry film thickness measuring device

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

1989-06-01

1990-12-18

Housel, James C.

Coating apparatus

Control means responsive to a randomly occurring sensed...

Condition of coated material

73601, 118712, 324230, G01B 710, G01B 1114

Patent

active

049778536

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 optical sensor positioned centrally and coaxially with an inductive eddy-current proximity sensor. The optical sensor measures the distance between the device and the upper surface of the paint film at specular reflection angle. 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: 3237446 (1966-03-01), Wood
patent: 3884076 (1975-05-01), Studer
patent: 4167878 (1979-09-01), Bottcher et al.
patent: 4398421 (1983-08-01), White
patent: 4614300 (1986-09-01), Falcoff
patent: 4702931 (1987-10-01), Falcoff
patent: 4814703 (1989-03-01), Carr et al.
patent: 4849694 (1989-07-01), Coates
"Measuring Thicknesses of Coatings on Metals", NASA Tech Briefs, May/Jun. 1986, pp. 94, 96.
Cyber Optics Bulletin, "Point Range Sensors", 1986.

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