Optics: measuring and testing – Angle measuring or angular axial alignment – With photodetection remote from measured angle
Patent
1980-10-27
1982-01-19
Buczinski, S. C.
Optics: measuring and testing
Angle measuring or angular axial alignment
With photodetection remote from measured angle
356 5, 356 285, G01B 1126, G01C 308
Patent
active
043113850
ABSTRACT:
A coherent detection scanning laser system having an optical system that compensates for the angular deviation of the received signal resulting from the scanning process, and having a detection system with output independent of spatially varying sensitivity or response of the detector caused by inhomogeneities therein.
In one embodiment, the local oscillator reference signal is compensated for the lag angle and the detector is placed at the image plane of the scanning antenna, and system geometry is arranged so that the image plane of the mirror providing the compensating reference signal coincides with the image plane of the scanning antenna. In another embodiment, the received signal is compensated for lag angle and the system geometry is arranged so that the detector receives a focused signal permitting the use of a smaller area.
REFERENCES:
patent: 3413633 (1968-11-01), Lehmann
patent: 3565528 (1971-02-01), Witte
patent: 3790278 (1974-02-01), Buczek et al.
patent: 3984685 (1976-10-01), Fletcher
Bartlett Milton D.
Buczinski S. C.
Pannone Joseph D.
Pitruzzella Vincenzo D.
Raytheon Company
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