Surveying instrument

Details Surveying instrument Surveying instrument

2006-07-27

2009-12-01

Tarcza, Thomas H (Department: 3662)

Optics: measuring and testing

Range or remote distance finding

With photodetection

Reexamination Certificate

active

07626686

ABSTRACT:
To provide a surveying instrument for measuring difference in required time of light or distance to an object to be measured while covering a wide dynamic range without adjusting light amount. A light pulse emanating from a light emitting section1is divided into a reference light cast to a reference light path F1and a measurement light cast to a measurement light path F2through which the measurement light travels to and is reflected back from the object to be measured. These two light beams are received with a light receiving section9. With a multiplex reflection optical fiber Mp1interposed in the middle of the measurement light path F2, the measurement light comes out as a row of multiplex light pulses attenuating successively in light amount at a constant rate. From this row of pulses, a measurement light of approximately the same in received light level as the reference light may be selected. Based on the selected measurement light and the reference light, the difference between the time required for the measurement light traveling through the measurement light path F2and the time required for the reference light traveling through the reference light path F1, or the distance to the object to be measured, is measured.

REFERENCES:
patent: 6469778 (2002-10-01), Asaka et al.
patent: 2005/0269489 (2005-12-01), Taverner
patent: 2006/0103850 (2006-05-01), Alphonse et al.
patent: 2007/0024869 (2007-02-01), Ostrovsky et al.
patent: 0 596 614 (1994-05-01), None
patent: 59-088673 (1984-05-01), None
patent: 05-232230 (1993-09-01), None
patent: 05-297140 (1993-11-01), None
patent: 06-265636 (1994-09-01), None
patent: 9-211128 (1997-08-01), None
patent: 2000-206246 (2000-07-01), None
patent: 2001-201573 (2001-07-01), None

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