Electric distance meter

Details Electric distance meter Electric distance meter

2006-08-22

2006-08-22

Tarcza, Thomas H. (Department: 3662)

Optics: measuring and testing

Range or remote distance finding

With photodetection

C356S003010, C356S004010, C356S005010

Reexamination Certificate

active

07095490

ABSTRACT:
An electric distance meter of the present invention comprises a device (1) to generate a modulation signal for modulating measuring light which is irradiated to an object, a device (4) to periodically generate an intermittent pulse signal for generating intermittent modulated measuring light by intermittently adding the modulation signal to a light emitting element (10), a device (5A) to generate an internal frequency signal (S5) with a frequency different from the modulation signal (S2), a light receiving element (27) for outputting a light receiving signal by receiving the intermittent modulated measuring light, a device (7) to generate an intermittent difference frequency signal (S7) by inputting the light receiving signal (S4) and the signal (S5), an arithmetic logical unit (36) for calculating a distance to the object based on a phase difference between a phase of the signal (S7) output from the device (7) and a phase of the intermittent difference frequency signal obtained through a reference optical path.

REFERENCES:
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patent: 3967111 (1976-06-01), Brown
patent: 4319332 (1982-03-01), Mehnert
patent: 4692023 (1987-09-01), Ohtomo et al.
patent: 4891624 (1990-01-01), Ishikawa et al.
patent: 5179286 (1993-01-01), Akasu
patent: 6452666 (2002-09-01), Barna et al.
patent: 05-232232 (1993-09-01), None
patent: 06051062 (1994-02-01), None
patent: 10285227 (1998-10-01), None

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