Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1993-10-05
1995-12-19
Porta, David P.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
25033912, 356432, G01J 3433
Patent
active
054770513
ABSTRACT:
Modulated light from a light source is incident on the surface of a scattering medium, and light passing through this scattering medium is externally detected. Components having a plurality of angular frequencies .omega..sub.1 and .omega..sub.2 corresponding to photon density waves propagating in the scattering medium are extracted from this detection signal. The extracted signals corresponding to these waves are compared with a signal of original modulated light to be incident on the scattering medium to detect a quantitatively measurable predetermined parameter such as a phase difference at a detection point for each angular frequency. The detected predetermined parameters have a predetermined relationship with absorptive and scattering constituents of the scattering medium. A pair of predetermined parameters are appropriately arithmetically calculated to eliminate the scattering coefficient, so that only the absorption coefficient can be independently calculated. Various pieces of information (including the linear integration value of the absorption coefficient in the scattering medium, the concentration of the specific material in the scattering medium, and the like) associated with absorption and the like in the scattering medium can be obtained in accordance with the calculated absorption coefficient.
REFERENCES:
patent: 4407290 (1983-10-01), Wilber
patent: 4824242 (1989-04-01), Frich et al.
patent: 4972331 (1990-11-01), Chance
patent: 5122974 (1992-06-01), Chance
patent: 5213105 (1993-05-01), Gratton et al.
NIR Spectrophotometry, "Non-Invasive Hemoglobin Oxygenation Monitor and Computed Tomography", SPEI, vol., 1431, (1991), pp. 284-293.
Patterson et al, "Applications of Time-Resolved Light Scattering Measurements to Photodynamic Therapy Dosimetry", SPIE, vol. 1203, (1990), pp. 62-75.
Patterson et al, "Time Resolved Reflectance and Transmittance for the Non-Invasive Measurement of Tissue Optical Properties", Applied Sptics, vol. 28, No. 12, Jun. 1989, pp. 2331-2336.
Sevick et al, "Time-Dependent Photon Migration Imaging", SPIE, vol. 1599, (1991), pp. 273-283.
Fishkin et al, "Diffusion of Intensity Modulated Near-Infrared Light in Turbid Media", SPIE, vol. 1432, (1991), pp. 122-135.
Sevick et al, "Quantitation of Time and Frequency-Resolved Optical Spectra for the Determination of Tissue Oxgenation", Analytical Biochemistry, Vo. 195, (1991) pp. 330-351.
Bruce David Vernon
Hamamatsu Photonics K.K.
Porta David P.
LandOfFree
Apparatus for measuring optical information in scattering medium does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for measuring optical information in scattering medium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for measuring optical information in scattering medium will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-993443