Electromagnetic method and apparatus to measure constituents of human or animal tissue
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United States of America Patent
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Feb 2, 1993
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app pub date -
Jul 3, 1991
filing date -
May 23, 1989
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Abstract
To deterine glucose or other constituents of the human or animal body, near-infrared radiation containing two alternating wavelengths that have equal extinction coefficients in the tissue is directed onto a sample area of the body. The intensity relation of the two different wavelengths is adjusted so as to balance the two wavelength detected signals. The extracellular-to-intracellular fluid ratio of the tissue is changed or is allowed to change, and the alternating component of the transmitted beam power is measured. The amplitude of the alternating-current (AC) signal given by the detector represents glucose concentration or the difference from a preset reference concentration.
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