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Angle of incidence selective band pass filter for implantable chemical sensor

  • US 9,377,351 B2
  • Filed: 04/24/2013
  • Issued: 06/28/2016
  • Est. Priority Date: 04/24/2012
  • Status: Expired due to Fees
First Claim
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1. A sensor comprising:

  • a sensor housing;

    a graft on at least a portion of an exterior surface of the sensor housing;

    indicator molecules distributed throughout the graft and configured to emit emission light at least to the receiving surface of the angle of incidence filter element;

    a light source contained within the sensor housing and configured to irradiate excitation light to the indicator molecules;

    a photodetector contained within the sensor housing and configured to convert received light into current indicative of the intensity of the received light;

    a dichroic band pass filter contained within the sensor housing and configured to prevent light having a wavelength outside a band pass region from reaching the photodetector and to pass light having a wavelength within the band pass region to the photodetector; and

    an angle of incidence filter element contained within the sensor housing, comprising a receiving surface, and configured to prevent light having an angle of incidence relative to an axis perpendicular to the receiving surface greater than a threshold angle from reaching the dichroic band pass filter and to propagate light having an angle of incidence relative to the axis perpendicular to the receiving surface less than the threshold angle to the dichroic band pass filter;

    wherein the angle of incidence filter element is a fiber optic bundle comprising a plurality of optical fibers.

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