Apparatus for determining the thickness of material

Details Apparatus for determining the thickness of material Apparatus for determining the thickness of material

1987-05-13

1990-02-20

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356382, G01B 1106

Patent

active

049029029

ABSTRACT:
A glass plate thickness measuring instrument wherein a beam of radiation is impinged on the glass to provide a pair of beams reflected from the front and back surfaces of the glass plate respectively. The two beams are made to fall on a radiation responsive device in the form of a charge coupled device, which provides pulsed image outputs of the beams in the form of staircase waveforms of a truncated Gaussian distribution. Electronic circuity, including a microprocessor, is employed to calculate the center of gravity of an area under both waveforms above a threshold value, and the distance between the respective centers of gravity calculated to provide a measure of the thickness of the material.

REFERENCES:
patent: 3807870 (1974-04-01), Kalman
patent: 4707611 (1987-11-01), Southwell

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