Optical system for measuring metabolism in a body
First Claim
1. An optical system for measuring metabolism in a body based upon an optical system for measuring metabolism in a body in which light radiating means for radiating light on the living body and light receiving means for detecting transmitted light radiated from the light radiating means and propagated in the living body are arranged on the living body and which is configured so that information in the living body is measured based upon a signal detected by the light receiving means with a substantial middle point of the light radiating means and the light receiving means as a measurement point, wherein:
- the light radiating means is provided with plural light sources respectively having a different wavelength; and
the light source having a wavelength according to the tissue of a measurement region in the living body and its optical property is selected out of the plural light sources.
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Abstract
The invention provides optical technique for measuring metabolism in a living body that can further reduce an error in measurement even if distance between irradiation and detection is fixed. The living body is classified into measurement regions and different measuring wavelengths are set according to the classification. For example, the head is classified into four regions of a parietal region, a frontal region, a temporal region and an occipital region and a wavelength according to each tissue is set in a wavelength selecting system. In measurement, wavelengths according to each measurement region are selected by multiple wavelengths-light radiating means. Besides, for a region having large personal difference, premeasurement is made using plural combinations of wavelengths and wavelengths are selected using a calculated error in measurement as a criterion.
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Citations
10 Claims
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1. An optical system for measuring metabolism in a body based upon an optical system for measuring metabolism in a body in which light radiating means for radiating light on the living body and light receiving means for detecting transmitted light radiated from the light radiating means and propagated in the living body are arranged on the living body and which is configured so that information in the living body is measured based upon a signal detected by the light receiving means with a substantial middle point of the light radiating means and the light receiving means as a measurement point, wherein:
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the light radiating means is provided with plural light sources respectively having a different wavelength; and
the light source having a wavelength according to the tissue of a measurement region in the living body and its optical property is selected out of the plural light sources. - View Dependent Claims (2, 3, 4, 5)
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6. An optical system for measuring metabolism in a body based upon an optical system for measuring metabolism in a body in which light radiating means for radiating light on the living body and light receiving means for detecting transmitted light radiated from the light radiating means and propagated in the living body are arranged on the living body and which is configured so that information in the living body is measured based upon a signal detected by the light receiving means with a substantial middle point of the light radiating means and the light receiving means as a measurement point, wherein:
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the light radiating means is provided with a wavelength variable light source that can radiate light of an arbitrary wavelength; and
the wavelengths of light radiated from the light source are selected according to the tissue of a measurement region in the living body and its optical property. - View Dependent Claims (7, 8, 9)
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10. An optical system for measuring metabolism in a body based upon an optical system for measuring metabolism in a body in which light radiating means for radiating light on the living body and light receiving means for detecting transmitted light radiated from the light radiating means and propagated in the living body are arranged on the living body and which is configured so that information in the living body is measured based upon a signal detected by the light receiving means with a region determined by an incident position by the light radiating means and a detection position by the light receiving means as a measurement region, wherein:
the light radiating means comprises;
a first group of light sources respectively having a different wavelength;
a second light source having a wavelength further different from the first group of light sources;
selecting means for selecting light of the light source having a wavelength according to the tissue of a measurement region in the living body and its optical property in the first group of light sources; and
an optical coupler for coupling an optical path of light selected by the selecting means and an optical path of light from the second light source and conducting it to the incident position.
Specification