Optics: measuring and testing – Angle measuring or angular axial alignment – Apex of angle at observing or detecting station
Patent
1988-08-19
1989-04-25
Buczinski, Stephen C.
Optics: measuring and testing
Angle measuring or angular axial alignment
Apex of angle at observing or detecting station
356152, G01B 1126, G01C 100
Patent
active
048242454
ABSTRACT:
An improved apparatus is disclosed for reliably and unambiguously sensing the angle of arrival of an electromagnetic radiation beam by a remote source. A sensor assembly 2 receives, through an optical window 22, the incident beam which is directed toward first and second detectors 10, 12 by a gradient beam splitter 24. The beam splitter 24 has a gradient of reference and transmittance deposited along one surface which is correlated to the angle of arrival of the radiation. The first detector 10 and second detector 12 receive a portion of the incident beam energy by reflection and transmission respectively from the beamsplitter 24. The ratio of a difference to a sum of the detector responses to the received energy is thereby also correlated with the angle of arrival. Atmospheric scintillation, which causes shifting concentrations of energy in clusters or "scintels" within the beam, is compensated by the action of gradient opaque stripes of the beam splitter 24 which divide the beam by a constant factor irrespective of the energy distribution. Thus when the ratio of difference to sum of the responsee to the divided beam by the first and second detector 10, 12 is taken, the correlation with angle of arrival is not affected by the shifting energy.
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Gardner Leland V.
Hardy Arthur H.
Buczinski Stephen C.
Karambelas A. W.
Laslo V. G.
Santa Barbara Research Center
Schubert W. C.
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