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5 terms
Photonics Dictionary: D
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rotation x
D x
degrees of freedom
The number of unique ways in which a part can move in an alignment system. In static alignment, there are six: one in the direction of and one in rotation about each of the X, Y and Z axes. In...
delta prism
A compact, folded version of a Dove prism, made of high-index glass with a silvered base and used for image rotation.
diurnal aberration
Atmospheric aberration caused by the Earth's rotation; the degree varies from 0 at the poles to a maximum of 0.31 s of arc at other locations.
drift curve
A technique used in astronomy that requires a radio telescope to be directed at a point in the sky west of the object under observation. The Earth's rotation causes the object to drift through the...
drift scan
An astronomical scanning technique for capturing images of stars without moving the sensor. To perform a drift scan, a CCD sensor's readout rate must be synchronized with the motion of celestial...
Photonics Dictionary
D
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