collimation error

collimation error

[‚käl·ə′mā·shən ‚er·ər]
(astronomy)
The amount by which the angle between the optical axis of a transit telescope and its east-west mechanical axis deviates from 90°.
(engineering)
Angular error in magnitude and direction between two nominally parallel lines of sight.
Specifically, the angle by which the line of sight of a radar differs from what it should be.
References in periodicals archive ?
It should be noted that in addition to being sensitive to odd order harmonics, such front-face back-face measurements are also sensitive to numerous other sources of misalignment such as collimation error, non-orthogonality between the standing axis and the transit axis, etc.
Evaluate of the standard deviation of a collimation error (pointing to the scale stroke) is equal to 2.
The component along T is equivalent to collimation error in theodolites.