Apparatus and method for non-invasive measurement of a substance within a body
First Claim
1. Apparatus for non-invasive measurement of a substance within a body, the apparatus comprising:
- a detector for sensing radiation emitted or remitted from a body;
optics configured to focus the radiation on a sensitive area of the detector;
a baffle attached to and in thermal contact with the detector, the baffle being disposed to at least partially surround a detector sensitive area and configured to minimize the incidence of stray radiation on the detector sensitive area,wherein an interior surface of the baffle opposite the detector has a high reflectivity and low emissivity, the interior surface of the baffle being formed to minimize the incidence of radiation reflection or multi-reflection on the detector sensitive area, andwherein the interior surface of the baffle constitutes a portion of a sphere surrounding the detector, a portion of the baffle above and opposite the sensitive area of the detector having an opening allowing the radiation to reach the sensitive area of the detector.
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Accused Products
Abstract
A method and apparatus for the noninvasive detection of a concentration of a substance in a body, such as glucose in the human bloodstream is disclosed. The apparatus measures substance concentration by detecting radiation in the far infrared range emitted by the body using an infrared detected in combination with a set of adequate filters. In order to achieve the accuracy required, the radiation values detected by the detector are corrected for the emissions of the system components. The temperature of each system component including the detector temperature and an ambient temperate is determined using temperature sensors attached to the various system components. These temperatures are correlated with a set of predetermined calibration parameters to correct the detector readings.
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Citations
4 Claims
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1. Apparatus for non-invasive measurement of a substance within a body, the apparatus comprising:
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a detector for sensing radiation emitted or remitted from a body; optics configured to focus the radiation on a sensitive area of the detector; a baffle attached to and in thermal contact with the detector, the baffle being disposed to at least partially surround a detector sensitive area and configured to minimize the incidence of stray radiation on the detector sensitive area, wherein an interior surface of the baffle opposite the detector has a high reflectivity and low emissivity, the interior surface of the baffle being formed to minimize the incidence of radiation reflection or multi-reflection on the detector sensitive area, and wherein the interior surface of the baffle constitutes a portion of a sphere surrounding the detector, a portion of the baffle above and opposite the sensitive area of the detector having an opening allowing the radiation to reach the sensitive area of the detector. - View Dependent Claims (2, 3, 4)
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Specification