Optics: measuring and testing – Angle measuring or angular axial alignment – Apex of angle at observing or detecting station
Patent
1990-09-06
1992-10-27
Evans, F. L.
Optics: measuring and testing
Angle measuring or angular axial alignment
Apex of angle at observing or detecting station
33282, G01B 1126
Patent
active
051594013
ABSTRACT:
The invention features an elevation-sensing system comprising an elevation-sensing instrument which includes a sighting device having an optical axis for aiming at an object and an electronic elevation-angle sensor attached to the sighting device and having an electrical characteristic indicative of elevation angle relative to an axis of the electronic elevation-angle sensor and a repeatability of at least 6 arcminutes over an angular range of said electronic elevation-angle sensor, and a processor for deriving an elevation angle from the electrical characteristic.
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