Optics: measuring and testing – By polarized light examination – With birefringent element
Patent
1992-04-02
1994-12-27
Turner, Samuel A.
Optics: measuring and testing
By polarized light examination
With birefringent element
356128, 356345, 356133, 385 12, G01B 902
Patent
active
053770080
ABSTRACT:
An apparatus useful in immunoassay of a fluid, light is directed to an optical sensor wherein the light is transmitted to a replaceable optical device that is responsive to index of refraction in a sensing region thereof that is exposed to the fluid. One portion of the light is transmitted via a compensation path that includes the sensing region to a first detector. Another portion of the light is transmitted via a sensing path that includes the sensing region to another detector. In one embodiment a ratioing device receives an output from each detector and provides a signal responsive to the ratio of the outputs. The replaceable optical device typically comprises a pair of channel waveguides in directional coupling arrangement, or a pair of channel waveguides in an interferometer arrangement, or a ridge waveguide having a curved or serpentine path configured so that nonspecific sensing effects are compensated.
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Boiarski Anthony A.
Busch James R.
Ridgway Richard W.
Wood Van E.
Battelle (Memorial Institute)
Turner Samuel A.
Wiesmann Klaus H.
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