Patent ID: 6239865
Filing Date: 2001-05-29
Classification: G01D,G01L

Abstract:
A sensor for measuring the distances to a medium and/or the physical properties thereof, comprising:a housing;at least one pair of optical fibers, each having an input end portion and an output end portion, the input end portion of a first fiber being connectable to a source of light and the output end portion of a second fiber being connectable to light intensity measuring means;a sensor head, including said input end portion of said second optical fiber and said output end portion of said first optical fiber affixedly located at least in proximity to each other;each of the output end portion of said first fiber and input end portion of said second fiber having an axis and a rim, said rims being cut at an angle .theta. with respect to said axis and said axes forming an angle .alpha. therebetween, andwherein, upon operation, the light emerging from the output end portion of said first fiber impinges on a surface of a medium at an angle of incidence .beta., and wherein .beta.=.function.(.alpha.,.theta.),characterized in that the output end portion of said first fiber and the input end portion of said second fiber are slightly cut off in a plane traversing at least one of said axes to form edge surfaces interfacing each other.