Surveying apparatus

Details Surveying apparatus Surveying apparatus

1995-06-20

1998-05-12

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

G01C 308

Patent

active

057514089

ABSTRACT:
There is provided a surveying apparatus for detecting an object reflector (102) and measuring a distance from the object reflector (102) based on a luminous flux reflected by the object reflector (102) by irradiating a luminous flux toward the object reflector which varies a direction of polarization of reflected rays relative to that of incident rays. The surveying apparatus includes a light source section (106) for radiating the luminous flux as a luminous flux having a predetermined direction of polarization; an irradiating optical system (101) for irradiating the luminous flux from the light source section (106) toward the object reflector (102); a polarizing optical element (122) for dividing a polarized/reflected luminous flux of which direction of polarization has been varied when reflected by the object reflector (102); a first light-receiving section (124, 126) for receiving the polarized/reflected luminous flux divided by the polarizing optical element (122); a second light-receiving section (120) for receiving the reflected luminous flux reflected by the object reflector (102); a detecting section (104) for detecting the object reflector based on an output signal from the first light-receiving section (124, 126); and a distance measuring section (131) for measuring the distance from the object reflector (102) based on an output signal from the second light-receiving section (120).

REFERENCES:
patent: 3773421 (1973-11-01), Gievers
patent: 4732472 (1988-03-01), Konig et al.
patent: 4786176 (1988-11-01), Froome
patent: 4830489 (1989-05-01), Cain et al.
patent: 5051934 (1991-09-01), Wiklund
patent: 5267014 (1993-11-01), Prenninger
Abstract--Japanese Doc. No. 4-313013.

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