Instrument for measuring angles

Optics: measuring and testing – Angle measuring or angular axial alignment – With photodetection remote from measured angle

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356143, 356149, G01B 1126

Patent

active

043988210

ABSTRACT:
An instrument for measuring sun elevation which includes a structure rotating at a controlled, constant speed. By means of a magnet on said structure a pulse is produced once per revolution. This pulse forms a datum point and can coincide with the horizon. A further pulse is produced by sunlight reflected onto a photo-sensitive device by a mirror rotating with said structure. An oscillator and divider produces a train of pulses, and there is a counter which counts the number of pulses of the train between the datum pulse and the further pulse. As the number of pulses counted is a measure of the time between the further and datum pulses, and this time is a measure of the angle through which said structure has rotated, and this in turn is a measure of the angle between the sun and the horizon, the number of pulses counted can be converted electronically into a read-out of the sun angle. In another form, specifically intended to measure the elevation of a star, the datum and other pulses are produced by rotation of discs, each having a slot therein. A light is shone on each disc and there are photo-sensitive devices normally blocked-off from the sources by the discs. As the discs rotate, the photo-sensitive devices produce pulses. One light source and photo-sensitive device produces the datum pulse and are maintained in a fixed position. The other light source and device move as the instrument is tilted upwardly. This causes the spacing between the two pulses to vary in dependence on the tilt of the instrument.

REFERENCES:
patent: 2037030 (1936-04-01), Kollmorgen
patent: 2155402 (1939-04-01), Clark
patent: 3131249 (1964-04-01), Kunze
patent: 3204102 (1965-08-01), Hand, Jr.
patent: 3349325 (1967-10-01), Bajars
patent: 3992106 (1976-11-01), Auerbach
McGraw-Hill Encyclopedia of Science and Technology, vol. 12, pp. 280, 281; vol. 13, p. 564, McGraw-Hill Book Company, 1971.

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