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Optical-based sensing devices

  • US 6,711,423 B2
  • Filed: 09/27/2001
  • Issued: 03/23/2004
  • Est. Priority Date: 08/26/1998
  • Status: Expired due to Term
First Claim
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1. An optical-based sensor for determining the presence or concentration of an analyte in a medium, said sensor comprising:

  • an enclosed sensor body having an outer surface surrounding said sensor body;

    a radiation source in said sensor body which emits radiation within said sensor body;

    an indicator element having an optical characteristic that is affected by the presence or concentration of an analyte, said indicator element comprising indicator molecules contained within a liquid polymeric matrix, and said indicator element being positioned on said sensor body to receive radiation that travels from said radiation source, and which transmits radiation into said sensor body;

    a photosensitive element located in said sensor body and positioned to receive radiation within the sensor body and which emits a signal responsive to radiation received from said indicator element; and

    said sensor body being configured such that some of the radiation received by said photosensitive element is reflected internally within said sensor body before striking said photosensitive element.

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