Method and apparatus for near-infrared quantitative analysis
First Claim
1. A method for performing near-infrared (NIR) quantitative analysis, comprising the steps of:
- providing NIR radiation at a plurality of different wavelengths for illumination of an object to be analyzed;
detecting NIR radiation transmitted through said object and accumulating detection data for each of said plurality of wavelengths; and
varying the amount of time that radiation at each wavelength illuminates said object according to the output level of radiation at each wavelength so as to provide substantially similar detection data resolution for each of said plurality of wavelengths.
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Abstract
Method and apparatus for performing near-infrared (NIR) quantitative analysis includes the steps of providing NIR radiation at a plurality of different wavelengths for illumination of an object to be analyzed, and varying the amount of time that radiation at each wavelength illuminates the subject according to the output level of radiation at each wavelength so as to provide substantially similar detection data resolution for each of the plurality of wavelengths. The method is particularly applicable to non-invasive quantitative measurement of blood analytes such as blood glucose levels, using low cost IREDs operating outside their one-half power bandwidths.
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Citations
15 Claims
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1. A method for performing near-infrared (NIR) quantitative analysis, comprising the steps of:
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providing NIR radiation at a plurality of different wavelengths for illumination of an object to be analyzed; detecting NIR radiation transmitted through said object and accumulating detection data for each of said plurality of wavelengths; and varying the amount of time that radiation at each wavelength illuminates said object according to the output level of radiation at each wavelength so as to provide substantially similar detection data resolution for each of said plurality of wavelengths. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for performing near-infrared (NIR) quantitative analysis, comprising:
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means for providing NIR radiation at a plurality of different wavelengths for illumination of an object to be analyzed; means for detecting NIR radiation transmitted through said object and accumulating detection data for each of said plurality of wavelengths; and means for varying the amount of time that radiation at each wavelength illuminates said object according to the output level of radiation at each wavelength so as to provide substantially similar detection data resolution for each of said plurality of wavelengths. - View Dependent Claims (7, 8, 9, 10)
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11. A near-infrared quantitative analysis instrument for non-invasive measurement of analytes in blood present in a body part of a subject, comprising:
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means for providing near-infrared energy at a plurality of different wavelengths for introduction into blood present in a body part of a subject; detecting means for detecting near-infrared energy emerging from said body part of said subject and providing a signal representative of the amount of near-infrared energy being detected; processing means for receiving signals from said detecting means and for processing said signals to determine the quantity of a specific analyte in said blood; and means for energizing said providing means in such manner to sequentially provide at least two different wavelengths of near-infrared energy each for a different amount of time. - View Dependent Claims (12, 13, 14, 15)
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Specification