Optics: measuring and testing – Angle measuring or angular axial alignment – With photodetection remote from measured angle
Patent
1974-03-11
1976-05-04
Wilbur, Maynard R.
Optics: measuring and testing
Angle measuring or angular axial alignment
With photodetection remote from measured angle
250203R, 250216, 356 4, 356 5, G01B 1126, G01J 120
Patent
active
039543404
ABSTRACT:
The invention relates to optical target tracking. A target image, particularly based on reflected laser light, is projected by an optical system onto a light-sensitive detector, control signals for directing purposes being generated depending on the position of the target image on the detector surface. At least when a clear target image on the detector surface would be small in comparison with the detector surface, the area of the target image is increased by blurring the target image, for instance by displacing the detector plane from the image plane of the optical system.
REFERENCES:
patent: 2070178 (1937-02-01), Pottenger, Jr. et al.
patent: 3133200 (1964-05-01), Collyer
patent: 3169191 (1965-02-01), Knapp
patent: 3497695 (1970-02-01), Smith
patent: 3514608 (1970-05-01), Whetter
patent: 3792268 (1974-02-01), Bjerke et al.
Blomqvist Ake Hugo Petrus
Eriksson Bertil Torbjorn
AB Bofors
Buczinski S. C.
Wilbur Maynard R.
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