The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 20, 2003
Filed:
Sep. 29, 2000
Yutaka Tsuchiya, Hamamatsu, JP;
Tsuneyuki Urakami, Hamamatsu, JP;
Hamamatsu Photonics K.K., Shizuoka-ken, JP;
Abstract
A concentration measuring apparatus for an absorption component in a scattering medium includes a light source ( ) for generating at least two light rays having predetermined wavelengths, the light rays having different transport scattering coefficients for a scattering medium ( ) as an object to be measured, and a known ratio of the transport scattering coefficients; light incidence means ( ) for making the light rays incident from a light incident position into the scattering medium ( ); photodetection means ( ), ( ) for detecting the light ray which has propagated inside the scattering medium ( ) at at least one photodetection position different from the light incident position to acquire at least one photodetection signal; parameter detection means ( ) for detecting, on the basis of the photodetection signal, a light intensity and a mean flight pathlength at the light detection position for each of the at least two light rays having predetermined wavelengths; and arithmetic processing means ( ) for calculating a concentration of an absorption component on the basis of a predetermined relationship between the ratio of the transport scattering coefficients, the light intensity, the mean flight pathlength, and a difference between absorption coefficients per unit concentration of the absorption component for the at least two light rays having predetermined wavelengths.