Apparatus for automatically measuring the thickness of a transpa

Details Apparatus for automatically measuring the thickness of a transpa Apparatus for automatically measuring the thickness of a transpa

1995-09-08

1997-12-09

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356381, G01B 902

Patent

active

056965834

ABSTRACT:
An apparatus for measuring a thickness of a coating formed on a surface of a component member includes a white light source for emitting a light beam to be reflected by the surface of the member, one or more filters, each of the filters capable of filtering the reflected light beam in a selected wavelength range, an identical number of photo-detection sections as filters, each of the photo-detection sections being used for converting the intensity of the filtered light beam into a counting reference signal having a logic high and low states, a counter for counting the logic high states to generate a count number and a signal processor for computing the coating thickness based on the count number. Each of the photo-detection sections has a photo-detector, an ampere-to-voltage convertor, a peak voltage value detector and a comparator.

REFERENCES:
patent: 4293224 (1981-10-01), Gaston et al.
patent: 4641971 (1987-02-01), Korth
patent: 4660979 (1987-04-01), Muething

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