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Angle Measuring Apparatus

IP.com Disclosure Number: IPCOM000096917D
Original Publication Date: 1962-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Scroxton, RR: AUTHOR

Abstract

The optical system employs an electrical readout for measuring the angular rotation of two bodies 10 and 11 with respect to each other about three mutually perpendicular axes.

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Angle Measuring Apparatus

The optical system employs an electrical readout for measuring the angular rotation of two bodies 10 and 11 with respect to each other about three mutually perpendicular axes.

Four narrow beam light sources 12... 15, four detecting units 16... 19 and two mirrors 20 and 21 are employed. Units 16... 19 each comprise a semiconductor p-n junction type device with at least two pairs of mutually perpendicular leads. These utilize the lateral photo current flow to define in orthogonal coordinates the relative location of the incident light beam. An analog computer 22 effects additions and subtractions of the signals from units 16... 19 and provides an output indicating the relative angular positions of the two bodies. Angular movements of one body with respect to the other cause displacement of the light beams on the detecting units.

The optical paths provided between light sources 13 and 14 and detecting units 17 and 18 are longer than the optical paths from the sources 12 and 15 to detecting units 16 and 19. The detecting units provide the computer with a unique set of signals for each and every relative position of the two bodies.

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