Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1994-07-26
1995-12-12
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356338, G01N 1506, G01N 2149, G01N 2185
Patent
active
054752345
ABSTRACT:
An apparatus and method for measuring component concentrations which enables accurate measurement of concentrations of component within an object in a non-destructive, non-invasive, and bloodless procedure. The apparatus comprises a light irradiator 1 for projecting pulse laser of different wavelengths toward an object 12 by means of a variable wavelength laser generating unit 11, a photodetector 2 for performing a time resolved measurement of the quantity of transmitted light from the object which is subject to changes with lapse of time after the generation of the pulse laser, and an arithmetic unit 3 for calculating concentrations of components in the object 12 and outputting the calculation result such that the relationship between time lapse and measured quantity of light is converted into a relationship between an optical path length representing the distance of light travel within the object 12 and a change in the measured quantity of light relative to a change in unit concentration so that the optical path length and the quantity of light which is measured when the change in the quantity of light is at a peak are stored in memory for each wavelength, the quantity of light being used as a basis for the calculation.
REFERENCES:
patent: 2610541 (1952-09-01), Rowland, Jr.
patent: 2854585 (1958-09-01), Simmons
patent: 4544274 (1985-10-01), Cremers et al.
patent: 5070246 (1991-12-01), Durham et al.
patent: 5119815 (1992-06-01), Chance
patent: 5353790 (1994-10-01), Jacques et al.
Time Resolved Spectroscopy and Imaging of Tissues, 1 Dec. 1991, "Noninvasive Measurement . . . ," McCormick et al., pp. 294-302.
Proceedings of IEEE, vol. 80, No. 6, 1 Jun. 1992, pp. 918-930, Wilson et al., "Time Dependent Optical Spectroscopy . . . ".
Physics in Medicine and Biology, vol. 33, No. 12, 1 Dec. 1988, pp. 1433-1442, Delpy et al., "Estimation of Optical . . . ".
Applied Optics (1 Nov. 1991), vol. 30, No. 31, pp. 4515-4520.
J. Biochem. (1991), vol. 109, No. 3, p. 455-461.
Sakura Takeshi
Uenoyama Harumi
Xu Kexin
Yamasaki Yutaka
Calogero Stephen
Kyoto Dai-ichi Kagaku Co. Ltd.
Nelms David C.
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