Radiation thickness gauge

Details Radiation thickness gauge Radiation thickness gauge

1975-05-06

1976-05-04

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

With means to inspect passive solid objects

250252, 250359, G01N 2300

Patent

active

039550869

ABSTRACT:
In a radiation thickness gauge of the type wherein the thickness of a sample is determined by measuring the amount of radiations transmitting through the sample, there is provided an x-ray generator for transmitting a radiation flux through a reference sheet utilized for calibration purposes and having a thickness manifesting a radiation absorption which is equivalent to that of the sample having a nominal thickness which has been compensated for the difference in the radiation absorption characteristics of the reference sheet and the sample, a radiation detector for detecting the amount of the radiations transmitting through the reference sheet and the sample, a memory for storing the output of the detector when the reference sheet is interposed, and an operator, such as a computer. The operator functions to substitute the output of the radiation detector when the sample is interposed for a term representing the variation in the thickness of an equation determined by the content of the memory and the radiation absorption function of the reference sheet so as to produce an output signal representing the thickness of the sample.

REFERENCES:
patent: 3334230 (1967-08-01), Shaffer
patent: 3611408 (1971-10-01), Shoemaker et al.

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