Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1998-03-09
2000-07-18
Font, Frank G.
Optics: measuring and testing
By polarized light examination
With light attenuation
356372, 356375, G01B 1114
Patent
active
060914971
ABSTRACT:
The invention provides a sensor for sensing the distances to a medium and/or displacements and the physical properties thereof, including 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 an d the output end face of a second light guide being optically coupled to a light intensity measuring means, the light guides being optically isolated from each other while at least the faces thereof are located adjacent to each other, each of the faces being cut at an angle .theta. with respect to the optical axis of its waveguide, so as to include an angle a between the axes thereof, the arrangement being such that, upon operation, the light emerging from the output end portion of the first light guide impinges on a surface of a medium at an angle of incidence .beta., and wherein .beta.=.function.(.alpha.,.theta.). The invention also provides a method for measuring the displacement of a body.
REFERENCES:
patent: 4576436 (1986-03-01), Daniel
patent: 5345076 (1994-09-01), Reddy
patent: 5402508 (1995-03-01), O'Rourke et al.
Kots Alexander
Paritsky Alexander
Font Frank G.
Phone-OR Limited
Punnoose Roy M.
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