APPARATUS AND METHOD FOR NON-INVASIVE MEASUREMENT OF A SUBSTANCE WITHIN A BODY
First Claim
1. A system for non-invasive measurement of a substance within a body, comprising:
- a detector configured to sense radiation emitted or remitted from a body;
an optical subsystem configured to focus the radiation on a sensitive area of the detector;
one or more temperature sensors attached to one or more of a plurality of elements of the optical subsystem and to the detector, the one or more temperature sensors being configured to measure the temperature of the one or more elements of the optical subsystem and the temperature of the detector; and
two or more temperature sensors configured to measure two or more respective ambient temperatures.
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Accused Products
Abstract
A system for non-invasive measurement of a substance, such as glucose, includes a detector configured to sense radiation and an optical subsystem configured to focus the radiation on a sensitive area of the detector. The system includes one or more temperature sensors attached to one or more of a plurality of elements of the optical subsystem and to the detector and two or more temperature sensors configured to measure two or more respective ambient temperatures. The one or more temperature sensors are configured to measure the temperature of the one or more elements of the optical subsystem and the temperature of the detector. A method of measuring a concentration includes detecting an infrared radiation value, measuring the temperature of the detector, one or more components of the optical system, and two or more ambient temperatures, and correlating the temperatures with calibration parameters to correct the detected infrared radiation value.
10 Citations
21 Claims
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1. A system for non-invasive measurement of a substance within a body, comprising:
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a detector configured to sense radiation emitted or remitted from a body; an optical subsystem configured to focus the radiation on a sensitive area of the detector; one or more temperature sensors attached to one or more of a plurality of elements of the optical subsystem and to the detector, the one or more temperature sensors being configured to measure the temperature of the one or more elements of the optical subsystem and the temperature of the detector; and two or more temperature sensors configured to measure two or more respective ambient temperatures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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 reduce 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 reduce the incidence of radiation reflection or multi-reflection on the detector sensitive area; and two or more temperature sensors configured to measure two or more respective ambient temperatures. - View Dependent Claims (11, 12, 13, 14)
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15. A method of noninvasively measuring a concentration of a substance in a body using an apparatus including a detector and an optical system, the method comprising the steps of:
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detecting an infrared radiation value emitted by the body in a wavelength range including at least one wavelength characteristic of the substance; measuring the temperature of the detector, one or more components of the optical system, and two or more ambient temperatures; and correlating the temperatures of the detector, the one or more components of the optical system, and the two or more ambient temperatures with a set of predetermined calibration parameters to correct the detected infrared radiation value for the effects of the emission of each of the detector and the one or more components of the optical system. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification