Apparatus and method for measuring the included angle of a refle

Details Apparatus and method for measuring the included angle of a refle Apparatus and method for measuring the included angle of a refle

1987-08-28

1988-07-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356391, G01N 2186

Patent

active

047587296

ABSTRACT:
An apparatus and method are provided for measuring the included angle of a reflective cone between opposite sides of the reflective cone. The apparatus includes means for illuminating the curved surface of the reflective cone with a collimated beam of light, the beam of light being generally parallel to the axis of the cone. A lens receives directly a portion of the light reflected from a first side of the cone, and focuses the portion of the light so received in a reference plane. A retro-reflective mirror arrangement, positioned on the side of the cone opposite the lens, receives directly a portion of the light reflected from a second side of the cone and redirects the light to the lens in a direction parallel to the light reflected from the second side of the cone. The second side of the cone is opposite to the first side of the cone. A light detection arrangement at the focal point of the lens displays the light received by the lens, whereby the spacing between the light received from the retro-reflective mirror arrangement and the light received directly from the cone is related to the included angle between the first and second sides of the reflective cone.

REFERENCES:
patent: 3419329 (1968-12-01), Vogeley et al.
patent: 3527953 (1970-09-01), Chitayat

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