Browse Prior Art Database

Triaxial Optical Angular Measuring System

IP.com Disclosure Number: IPCOM000077528D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Heger, NE: AUTHOR [+2]

Abstract

The optical system of Fig. 1 measures and/or monitors the relative angular movement between two spaced objects, not shown, located at stations A and B, respectively, about the three mutually orthogonal reference axes X, Y, Z, i.e., the angular displacements of pitch, yaw, and roll.

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Triaxial Optical Angular Measuring System

The optical system of Fig. 1 measures and/or monitors the relative angular movement between two spaced objects, not shown, located at stations A and B, respectively, about the three mutually orthogonal reference axes X, Y, Z, i.e., the angular displacements of pitch, yaw, and roll.

At station A, two light beams 1, 2, are projected onto the reflecting surfaces 3, 4, respectively, located at station B. Surfaces 3 and 4 are inclined at an angle alpha with respect to each other. The light beams 1 and 2 are provided by a two- axis photoelectric autocollimator 5 and a single-axis photoelectric centering autocollimator 6. Each beam 1, 2 is passed through a pair of counter rotating optical wedges 7, 8, respectively. The optical wedges are servo driven to center the reflected beam with which it is associated in the photoelectric sensor of the particular autocollimator 5, 6, when the particular projected beam 1, 2 is coincident with the normal of the particular surface 3, 4. Sensor, control and measuring circuit apparatus 9 provides appropriate signals for driving the wedges, centering the reflected beam, and measuring the angle of the wedge position. Autocollimators 5, 6, optical elements 7, 8 and circuitry 9 are mounted in a suitable housing 10 which is rigidly affixed to the object located at station A. Likewise, surfaces 3, 4 are part of a target mirror rigidly affixed to the other object located at station B. Autocollimator 5 is used to measure pitch and yaw, whereas, autocollimator 6 is used to measure roll.

In operat...