Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1997-01-03
1998-10-20
Hellner, Mark
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 6, G01C 308, G01C 2500
Patent
active
058254641
ABSTRACT:
A calibration system and method include isotropically diffusing high-intensity light emitted from a detection apparatus, with the diffused light being coupled to at least one optical line, typically an optical fiber. In the preferred embodiment, the apparatus to be calibrated is a light detection and ranging (LIDAR) apparatus and the isotropic diffusion is achieved by means of an integrating sphere. For calibrating distance calculations, the optical fiber includes a reflecting mechanism, such as Bragg gratings, at a fixed and known distance from the input end of the optical fiber. The reflecting mechanisms simulates the presence of a remote object at the known distance. For a velocity calculation, a frequency offset may be introduced to the light propagating through the optical fiber, thereby simulating a Doppler shift induced by a moving object. The simulations of the presence and movement of remote objects are used to calibrate the apparatus.
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