Electro-optical measuring system

Details Electro-optical measuring system Electro-optical measuring system

1981-09-03

1984-01-24

Punter, William H.

Optics: measuring and testing

By configuration comparison

With photosensitive film or plate

250239, 356256, 356372, G01B 1100, G02B 514

Patent

active

044272960

ABSTRACT:
An electro-optical measuring system is described wherein a laser or light beam is precisely translated in a straight line perpendicular to the direction of propagation of the beam at a uniform, repeatable speed to define a time-varying sensing field whose energy is picked up by a photosensor which yields an output signal. An object whose dimension is to be measured is inserted in the field whereby the output signal of the photosensor takes the form of a pulse whose leading edge is developed by the traversal of the beam across one edge of the object, thereby blocking passage of the energy to the photosensor. The trailing edge is developed by the traversal of the beam across the opposite edge of the object thereby restoring the energy to the photosensor. The width or time duration of the pulse is a measure of the distance between the two edges. Measurements of exceptional precision are obtained by a circulation reducer in the light path of the translated beam to substantially eliminate convection currents in the air, further precision is obtained by using group delay equalization in the edge sensing signal processing to reduce systematic errors due to variations in edge pulse width, and by using analog interpolation to provide high resolution measurement of the location of the edge of the object.

REFERENCES:
patent: 3892962 (1975-07-01), Whited
patent: 3907439 (1975-09-01), Zanoni
patent: 4074938 (1978-02-01), Taylor
patent: 4097158 (1978-06-01), Dehait
Taylor, F. M., "Using A Laser Micrometer for Precision Control of Wire Diameter & Position on a CV Line", Proc. 13th, 23rd, Intnat. Wire & Cable Symposium, Atlantic City, N.J., Dec. 3-5, 1974, pp. 326-329.
Group, "The Photoelectric Astrolabe Type II", Chinese Astronomy, vol. 1, No. 1, 6/1977 pp. 79-87.
Leonard, M., "Digital Non Contact Gages for the Metals Industry", Proc. 19th Intern. Iron & Steel Instrum. Sym., Pittsburgh, Pa., Mar. 17-29, 1979, pp. 15-25.

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