Method of measuring thickness

Details Method of measuring thickness Method of measuring thickness

1975-10-22

1978-03-07

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

250560, 356167, G01B 1102, G01B 1100

Patent

active

040777235

ABSTRACT:
A method of measuring a dimension of a body, the method comprising: direcg a beam of optical rays towards each of two points on the surface of the body at opposite sides of the body; forming rays reflected from the said points into two distinct reflected beams; directing the reflected beams towards a common plane by means of an optical system which causes the two resulting images to follow two respective straight lines, during displacement, two rows of photodiodes being arranged along the two respective straight lines; subjecting both rows of photodiodes to continuous and synchronized electronic scanning; starting a time counter when the scanning of one row of photodiodes detects a photodiode illuminated by an image; and stopping the counter when the scanning of the other row of photodiodes detects a photodiode illuminated by the other image, the time interval registered by the counter being representative of the said dimension.

REFERENCES:
patent: 3619070 (1971-11-01), Pirlet
patent: 3736063 (1973-05-01), Ohno et al.
patent: 3807870 (1974-04-01), Kalman

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