Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1985-01-24
1985-12-24
Buczinski, S. C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356141, 356152, 455605, 455617, G01C 308, G01C 100, G01B 1126
Patent
active
045602700
ABSTRACT:
An electronic distance meter which makes a distance measurement by phase comparison between measuring signals modulated on an emitted light beam and on a received light beam reflected from a target is provided with a microphone, an amplifier and an extra modulation circuit, which modulates audible information on the measuring signal of the distance meter. A receiver provided with a detector sensible for the optical wavelength region of the emitted light beam is mounted at a reflecting prism mounted at the target. The receiver at the prism is provided with circuits for detecting the audible information modulated on the measuring signal and a loud speaker or an ear phone. At a receiver of the distance meter the audible information is filtered out from the received measuring signal before distance calculation is made by internal circuits of the instrument.
REFERENCES:
patent: 2607916 (1952-08-01), Albersheim
patent: 3460139 (1969-08-01), Rittenbach
patent: 3662180 (1972-05-01), Jorgensen et al.
patent: 3680958 (1972-08-01), Von Bose
patent: 4131791 (1978-12-01), Lego
patent: 4143263 (1979-03-01), Eichweber
patent: 4355894 (1982-10-01), Maeda
Hertzman Mikael
Wiklund Klas R.
Buczinski S. C.
Geotronics AB
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