Patent ID: 6091497
Filing Date: 2000-07-18
Classification: G01B,G01D

Abstract:
A sensor for sensing the distances to a medium and/or displacements and the physical properties of said medium comprising:a housing;at least one pair of solid light guides each having an input end face and an output end face;at least one source of light and at least one light intensity measuring means;the input end face of a first light guide being optically coupled to a source of light and the output end face of a second light guide being optically coupled to a light intensity measuring means;means for isolating said light guides from each other while at least the faces thereof are located in close proximity to each other;each of said faces being cut at an angle .theta. with respect to the optical axis of its waveguide and said axis forming an angle .alpha. therebetween;the apparatus being such that, upon operation, the light emerging from the output end portion of said first light guide impinges on a surface of a medium at an angle of incidence .beta., and wherein .beta.=.function.(.alpha.,.theta.).