Integrated optical directional-coupling refractometer apparatus

Details Integrated optical directional-coupling refractometer apparatus Integrated optical directional-coupling refractometer apparatus

1990-09-20

1992-12-22

Turner, Samuel A.

Optics: measuring and testing

By polarized light examination

With birefringent element

356345, 356128, 385 12, G01B 902

Patent

active

051737477

ABSTRACT:
In 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 reference path to a first detector. Another portion of the light is transmitted via a sensing path that includes the sensing region to another detector. 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 serpentine path.

REFERENCES:
patent: 4815843 (1989-03-01), Tiefenthalga et al.
patent: 4950074 (1990-08-01), Fabricius et al.
patent: 4989979 (1991-02-01), Buckman

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