Optics: measuring and testing – Angle measuring or angular axial alignment – With photodetection remote from measured angle
Patent
1975-05-30
1976-11-02
Wilbur, Maynard R.
Optics: measuring and testing
Angle measuring or angular axial alignment
With photodetection remote from measured angle
73167, 89 41L, 356147, G01B 1126
Patent
active
039893847
ABSTRACT:
The angle measuring system comprises: a first mirror rigidly attached to muzzle end of a long gun barrel in a plane normal to the bore axis; second and third mirrors mounted on the gun mount near each other at the rear end of the barrel facing outwardly at 45.degree. to the bore axis; and a collimated light source positioned to project a primary light ray onto the second mirror at a 45.degree. angle to be reflected to the first mirror and then reflected back to the third mirror. A set of mirrors is mounted in the path of the ray reflected from the third mirror, to split the primary ray into two separate substantially-parallel component rays having vertical components of transverse motion corresponding respectively to the vertical and horizontal components of angular motion of the gun muzzle and first mirror. An 8-sided mirror is mounted in the paths of the two components rays to spin at a constant speed about a vertical axis for scanning each component ray across a sensor including a V-shaped photosensitive element. A recording device electrically connected to each sensor calculates and records the time of scan of each component ray across the "V" as a measure of the vertical motion of the component ray; and hence, of the angular motion of the gun muzzle.
REFERENCES:
patent: 2489220 (1949-11-01), Herbold
patent: 2581355 (1952-01-01), Brown
patent: 2977858 (1961-04-01), Jasse
patent: 3684383 (1972-08-01), Johansson
patent: 3796497 (1974-03-01), Mathisen et al.
patent: 3813171 (1974-05-01), Teach et al.
patent: 3865483 (1975-02-01), Wojcik
Buczinski S. C.
Edelberg Nathan
Erkkila A. Victor
The United States of America as represented by the Secretary of
Webb Thomas R.
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