Optics: measuring and testing – Blood analysis – Hemoglobin concentration
Patent
1989-05-01
1991-07-16
McGraw, Vincent P.
Optics: measuring and testing
Blood analysis
Hemoglobin concentration
356435, 350 9624, 128633, G01N 3348, G01N 2101, G02B 604, A61B 500
Patent
active
050320246
ABSTRACT:
An optical examination apparatus for optically examining density, distribution, etc. of oxygen in an object to be examined such as organic tissue like brain tissue, of man or animal compressing a light source, an optical fibre bundle having one end on which light emitted from the light source is incident and which is divided at the other end into a first and second branch with a predetermined ratio of division, transmitted and scattered light detection means for detecting light is emitted from the first branch of the fibre bundle and transmitted through and scattered by the object to be examined, monitoring light detection means for detecting monitoring light emitted from the second branch fibre bundle, normalization means for normalizing an output of the transmitted and scattered light detected means on the basis of an output from the monitoring light detection means, representative sampling means for ensuring that the light output from the second branch fibre bundle is representative of that output by the light source. The representative sampling means may be provided by distributing the optical fibres forming the second branch fibre bundle uniformly over the one end of the optical fibre bundle or may comprise a mode scrambler interposed between the one end of the optical fibre bundle and the light source to distribute light from the light source over the whole fibre bundle.
REFERENCES:
patent: 3885879 (1975-05-01), Louder et al.
patent: 3992110 (1976-11-01), Frazer et al.
patent: 4281645 (1981-08-01), Jobsis
patent: 4908762 (1990-04-01), Suzuki et al.
Hamamatsu Photonics Kabushiki Kaisha
Keesee LaCharles P.
McGraw Vincent P.
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