Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1989-10-30
1990-12-11
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
2502081, 356401, G01C 308, H01J 4014
Patent
active
049765388
ABSTRACT:
A device for detecting and displaying the relative position of a generally horizontal reference plane of light, even when partial shading of the device occurs, produces a linear response that is independent of spot size and energy distribution. The device includes a photodetector means having first and second interdigitated photodetector elements positioned adjacent each other on the device. The first and second interdigitated photodetector elements provide first and second detection signals, respectively. A circuit means, responsive to the photodetector means, determines the relative levels of the first and second detection signals such that the position of the reference plane of light with respect to the detector device is determined. A display means, responsive to the circuit means, provides an indication of the position of the reference plane of light with respect to the detector device.
REFERENCES:
patent: 3511155 (1970-05-01), Yamada
patent: 3649122 (1972-03-01), Holtz
patent: 4062634 (1977-12-01), Rando et al.
patent: 4071297 (1978-01-01), Leitz et al.
patent: 4240208 (1980-12-01), Pehrson
patent: 4674069 (1987-06-01), Mizuno
patent: 4676634 (1987-06-01), Petersen
patent: 4725136 (1988-02-01), McCullough et al.
patent: 4732471 (1988-03-01), Cain et al.
Buczinski Stephen C.
Spectra-Physics Inc.
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