Coating thickness gauge by X-ray fluorescence

Details Coating thickness gauge by X-ray fluorescence Coating thickness gauge by X-ray fluorescence

1994-02-09

2000-05-09

Church, Craig E.

X-ray or gamma ray systems or devices

Specific application

Fluorescence

378 44, G01N 23223

Patent

active

060614250

ABSTRACT:
In order to automatically measure the thickness of coatings on a sample, a plurality of calibration curves are stored in a memory circuit beforehand, and X-ray fluorescence generated by irradiation of the sample with primary X-rays is detected by an X-ray fluorescence coating thickness gauge. The X-ray fluorescence is differentiated according to wavelength (energy) by a differentiating circuit. By this differential manipulation, the materials of a sample are identified. Based on the identified constituents of a sample, automatic selection can be made of the most probable and suitable calibration curve out of the plural number of calibration curves stored in a memory and finally coating thickness can be measured on the basis of the selected calibration curve and the intensity of X-ray fluorescence of the sample obtained by the coating thickness gauge.

REFERENCES:
patent: 4959848 (1990-09-01), Parobek

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