G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 17/08 (2006.01) G01B 11/03 (2006.01) G01S 17/02 (2006.01) G01S 17/87 (2006.01)
Patent
CA 2053125
ABSTRACT OF THE DISCLOSURE Elements of an optical system are placed at points (A) and the spatial coordinates of these points are measured. The optical system comprises on the one hand an optical device which may be mounted on board an aircraft (2) and on the other hand reflectors (10) such as reflectors of the cube corner type. The optical device includes a pulsed laser source and a detector which is sensitive to the radiation emanating from the laser source. The desired spatial coordinates are determined from measurements of transit times of reflected laser pulses. The pulses (8) emitted by the laser source are caused to diverge in order to increase the width of their angular field and the radiation reflected from the reflectors (10) is collected in a wide field and transmitted to the detector. The system is applicable in particular to high-precision topography for the purpose of analyzing land subsidence.
Fetherstonhaugh & Co.
Institut Geographique National
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