G - Physics – 01 – B
Patent
G - Physics
01
B
33/46
G01B 11/00 (2006.01)
Patent
CA 1266562
DISTANCE MEASURING APPARATUS ABSTRACT OF THE DISCLOSURE An apparatus for monitoring and determining the distances of points on a surface from a reference axis includes a light source, such as a laser, for projecting a main beam of light of relatively small diameter along an axis. A device, such as a fibre grating, is provided for splitting the main beam of light into a plurality of discrete fractional beams of light. A further component, such as a diverging lens, angularly displaces the fractional beams relative to each other so the beams extend along a common plane towards a position for an object. Light reflected from the surface is projected onto a linear photodetector, the positions where the reflected fractional beams strike the linear photodetector being related to the distance from a reference axis to the points on the object where the fractional beams are reflected. Preferably there is a light gathering device such as a converging lens system for gathering the fractional light beams reflected off the object and for projecting real images thereof onto the photodetector.
519036
Leong Kenneth
Stewart Donald
LandOfFree
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