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6 terms
Photonics Dictionary: A
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measure angles x
A x
alidade
An old name for the rotating arm moving about an axis of rotation over a divided circle used to measure angles. Now the term refers to a small stadia telescope mounted over a ruler for use in...
aiming circle
An instrument designed to measure angles in azimuth; used in general topographic work and military gunnery.
angle gauge
A glass or metal measurement tool having a precisely calibrated angle between two of its faces.
angle-tracking system
A system in which a sequence of direct measurements of the target position is fed into a tracking filter that may produce refined estimates of past, present and future target positions.
angular subtense
The measured planar or solid angle of related aspects of an optical system with respect to an optical axis.
azimuth angle
1. In astronomy, the angle measured clockwise (eastward) in a horizontal plane, usually from north (true north, Y-north, grid north or magnetic north). 2. With relation to the plane-polarized light...
Photonics Dictionary
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