G - Physics – 01 – B
Patent
G - Physics
01
B
354/55, 33/60
G01B 11/24 (2006.01)
Patent
CA 1263754
METHOD AND SYSTEM FOR DETERMINING SURFACE PROFILE INFORMATION ABSTRACT OF THE-DISCLOSURE Optical triangulation is used for determining the profile of a surface with only two photomultiplier tubes needed for optical sensing in a flying spot camera system. A feedback arrangement varies the angle at which a laser beam is applied to the surface such that the image of the beam on the surface tends to be maintained constant with respect to a linear reference position parallel to a scanning direction. Deviations in the image from its reference position as caused by surface height variations are used in the feedback arrangement to change the deflection angle. The deflection angle is in turn detected and is indicative of the variations in sur- face height. As an anti-noise feature, amplitude modula- tion is impressed upon the laser beam directed towards the surface and a filter network is used to filter photo- multiplier response so as to exclude response to back- ground optical noise. In order to maintain a very wide dynamic range, the modulation amplitude of the light applied to the surface is varied in inverse relationship to the intensity of reflected light sensed by the photo- multipliers.
507613
Company General Electric
Eckersley Raymond A.
Penney Carl M.
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