Method and apparatus for multi-spectral analysis of organic blood analytes in noninvasive infrared spectroscopy
First Claim
1. An apparatus for determining the concentration of an organic blood analyte in a body tissue sample, comprising:
- (a) means for irradiating the sample with incident radiation containing a plurality of distinct, nonoverlapping spectral regions within the infrared spectrum, wherein each of the spectral regions encompass a range of wavelengths between approximately 1100 and 5000 nanometers;
(b) means for collecting reflected radiation emerging from tie sample and directing said reflected radiation into a beam path;
(c) adjustable filter means disposed in the beam path, wherein said adjustable filter means attenuates the intensity of radiation in the beam path;
(d) principal analyte filter means capable of receiving radiation emerging from the adjustable filter means, and selectively passing discrete wavelengths therefrom, wherein said discrete wavelengths are specifically correlated with the concentration of the analyte;
(e) second filter means capable of receiving the discrete wavelengths emerging from the principal analyte filter means and attenuating the intensity of said wavelengths;
(f) detection means for receiving the attenuated wavelengths emerging from the second filter means;
(g) means for converting the detected wavelengths into a signal representative of the intensity of said wavelengths; and
(h) means for correlating the signal obtained in step (g) to determine the concentration of the analyte.
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Abstract
A method and apparatus are described for determining the concentration of an organic blood analyte using multi-spectral analysis in the near infrared and mid-infrared ranges. Incident radiation containing a plurality of distinct, nonoverlapping regions of wavelengths in the range of approximately 1100 to 5000 nm is used to scan a sample. Diffusively reflected radiation emerging from the sample is detected, and a value indicative of the concentration of the analyte is obtained using an application of chemometrics techniques. Information obtained from each nonoverlapping region of wavelengths can be cross-correlated in order to remove background interferences.
632 Citations
13 Claims
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1. An apparatus for determining the concentration of an organic blood analyte in a body tissue sample, comprising:
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(a) means for irradiating the sample with incident radiation containing a plurality of distinct, nonoverlapping spectral regions within the infrared spectrum, wherein each of the spectral regions encompass a range of wavelengths between approximately 1100 and 5000 nanometers; (b) means for collecting reflected radiation emerging from tie sample and directing said reflected radiation into a beam path; (c) adjustable filter means disposed in the beam path, wherein said adjustable filter means attenuates the intensity of radiation in the beam path; (d) principal analyte filter means capable of receiving radiation emerging from the adjustable filter means, and selectively passing discrete wavelengths therefrom, wherein said discrete wavelengths are specifically correlated with the concentration of the analyte; (e) second filter means capable of receiving the discrete wavelengths emerging from the principal analyte filter means and attenuating the intensity of said wavelengths; (f) detection means for receiving the attenuated wavelengths emerging from the second filter means; (g) means for converting the detected wavelengths into a signal representative of the intensity of said wavelengths; and (h) means for correlating the signal obtained in step (g) to determine the concentration of the analyte. - View Dependent Claims (2, 3, 4)
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5. An apparatus for determining the concentration of an organic blood analyte in a body tissue sample, comprising:
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(a) means for irradiating the sample with incident radiation containing a plurality of distinct, nonoverlapping spectral regions within the infrared spectrum, wherein each of the spectral regions encompass a range of wavelengths between approximately 1100 and 5000 nanometers; (b) means for collecting reflected radiation emerging from the sample and directing said reflected radiation into a beam path; (c) filter means disposed in the beam path, said filter means comprising a plurality of sections each configured to selectively pass at least one different wavelength from the reflected radiation emerging from the sample; (d) a plurality of detectors arranged such that each wavelength emerging from the filter means is detected by a discrete detector; (e) means for converting the detected wavelengths into a signal representative of the intensity of said wavelengths; and (f) means for correlating the signal obtained in step (e) to determine the concentration of the analyte. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. An apparatus for determining the concentration of an organic blood analyte in a body tissue sample, comprising:
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(a) means for irradiating the sample with incident radiation containing a plurality of distinct, nonoverlapping spectral regions within the infrared spectrum, wherein each of the spectral regions encompass a range of wavelengths between approximately 1100 and 5000 nanometers; (b) means for collecting reflected radiation emerging from the sample and directing said reflected radiation into a beam path; (c) diffraction grating means disposed in the beam path for receiving reflected radiation emerging from the sample and selectively passing discrete wavelengths therefrom, wherein said discrete wavelengths are specifically correlated with the concentration of the analyte; (d) a linear detector array for receiving the passed wavelengths emerging from the diffraction grating means; (e) means for converting the detected wavelengths into a signal representative of the intensity of said wavelengths; and (f) means for correlating the signal obtained in step (e) to determine the concentration of the analyte. - View Dependent Claims (13)
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Specification