Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1978-05-25
1979-10-23
Buczinski, S. C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
33284, 356141, 356148, G01C 308, G01B 1126
Patent
active
041719077
ABSTRACT:
A device for measuring distances to a target includes electronic circuits for generating a light which is amplitude modulated by three selectable frequencies. Also included are optics for focusing the amplitude modulated light onto the target, and for receiving reflection of the light therefrom. Additional circuits convert the received light to electrical signals representative thereof, and compute the phase angles between these signals and the amplitude modulating signals. The distance to the target is then calculated based on these phase angles and the wavelength of frequencies equal to the differences between the three selectable frequencies. Another circuit uses an accelerometer to measure vertical angle to the target, and further distance measurements are made based thereon. Still other circuits compensate for a variety of potential error causing conditions, such as signal waveform asymmetry and component tolerance. A subassembly of the device is mountable on a theodolite telescope and utilizes folded optics in order to be plungeable.
REFERENCES:
patent: 3111665 (1953-11-01), Werner et al.
patent: 3778159 (1973-12-01), Hines et al.
patent: 3832056 (1974-08-01), Shipp et al.
patent: 3848999 (1974-11-01), Dall'Armi
patent: 3874087 (1975-04-01), Nunlist
patent: 4113381 (1978-09-01), Epstein
Bullock et al., Hewlett-Packard Journal, vol. 27, No. 8, pp. 2-12. Apr. 1976.
Aga Geodimeter 700 Operating Manuel, Aga Geotronics AB, S-18181 Lidingo, Sweden.
Bruce Robert L.
Busche William W.
Hill Douglas G.
Jekel Richard N.
Stufflebeam James E.
Buczinski S. C.
Cubic Western Data
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