Refractive index sensor using internally reflective light beams

Details Refractive index sensor using internally reflective light beams Refractive index sensor using internally reflective light beams

2007-09-18

2007-09-18

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

Plural test

C356S436000, C356S445000

Reexamination Certificate

active

11168151

ABSTRACT:
A sensor system comprised of a diffuse light source and a sensor mounted on a transparent layer of material that is adjacent to a fluid. The refractive index of the transparent layer is greater than the refractive index of the fluid, causing a portion of the diffuse light source to be reflected from the interface of the transparent layer and the adjacent fluid. A sensor is placed at a location to intercept the reflected light. The diffuse light source and the sensor are optically coupled to the transparent layer with a transparent material wit a refractive index greater than that of the fluid. A light absorbing coating is placed ante surface of the transparent layer in order to absorb extraneous light from internal scattering of light from the fluid and light external to the sensor system.

REFERENCES:
patent: 5694210 (1997-12-01), Newell et al.
patent: 2006/0068490 (2006-03-01), Tang et al.

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