Flourescence sensing device

Details Flourescence sensing device Flourescence sensing device

1997-05-13

1999-06-08

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25022714, 356436, G01N 1506

Patent

active

059106611

ABSTRACT:
A fluorescence sensing device for determining the presence or concentration of an analyte in a liquid or gaseous medium is constructed of an optical filter, which is positioned on a photodetector and which has a thin film of analyte-permeable, fluorescent indicator molecule-containing material on its top surface. An edge-emitting, light-emitting P-N junction is positioned on the top surface of the optical filter such that the P-N junction from which light is emitted is positioned within the film. Light emitted by the fluorescent indicator molecules impacts the photodetector thereby generating an electrical signal that is related to the concentration of the analyte in the liquid or gaseous medium. Fluorescence sensing devices according to this invention are characterized by very compact sizes, fast response times and high signal-to-noise ratios.

REFERENCES:
patent: 4755667 (1988-07-01), Marsoner et al.
patent: 4872759 (1989-10-01), Stich-Baumeister et al.
patent: 5043286 (1991-08-01), Khalil et al.
patent: 5517313 (1996-05-01), Colvin, Jr.
Colvin, Jr., A.E., et al., "A Novel Solid-State Oxygen Sensor," Johns Hopkins APL Technical Digest, vol. 17, No. 4, pp. 377-385 (1996). (Month unknown).

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