Improved fluorescence sensing device

G - Physics – 01 – N

Patent

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G01N 21/64 (2006.01) G01N 21/77 (2006.01)

Patent

CA 2287307

A fluorescence sensing device for determining the presence or concentration of an analyte in a liquid or gaseous medium is constructed of a light-emitting diode having a hole (29) generally perpendicular to the P-N junction, such that light is emitted from said junction into said hole (29). The hole is filled with a fluorescent matrix (32) which is permeable to analyte and which contains fluorescent indicator molecules whose fluorescence is attenuated or enhanced by the presence of analyte. A photodetector (23) is positioned at one end of the hole, such that fluorescent light received from the fluorescent indicator molecules is converted to an electrical signal that may be correlated to the presence or concentration of analyte in a gaseous or liquid medium in contact with the fluorescent matrix.

L'invention concerne un dispositif capteur à fluorescence, permettant de déterminer la présence ou la concentration d'un analyte dans un milieux liquide ou gazeux, et constitué d'une diode électroluminescente présentant une cavité (29) généralement perpendiculaire à la jonction P-N, de façon que la lumière émise par la jonction tombe dans ladite cavité (29). Celle-ci est remplie d'une matrice fluorescente (32) perméable à l'analyte et contenant des molécules d'un indicateur fluorescent, dont la fluorescence est atténuée ou augmentée par la présence dudit analyte. Un photodétecteur (23), positionné à une extrémité de la cavité, convertit la lumière fluorescente provenant des molécules d'indicateur fluorescent en un signal électrique, qui peut être corrélé à la présence ou à la concentration d'un analyte dans un milieu liquide ou gazeux en contact avec la matrice fluorescente.

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