A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 5/00 (2006.01) A61B 5/053 (2006.01) G01N 21/25 (2006.01) G01N 33/487 (2006.01) G01N 37/00 (2006.01) G01N 21/35 (2006.01)
Patent
CA 2376747
An instrument in which NIR light reflects against the skin and the water content correlates with the amount of light absorbed. Water dominates large blocks of the NIR absorption spectra. 1940 nm and 1460 nm were used as measurement wavelengths. A quartz-halogen lamp was used as a light source for the instrument and two band pass filters were used to select the two measurement wavelengths. Laser diodes can also be used. With laser diodes the wavelength is fixed and the light can be chopped by switching the laser diode on and off rapidly. Chopping is a convenient way to synchronise he photo diode (the sensor) with the source. Tests on thin layers of paper show the feasibility of the approach described; for a relatively inexpensive, non-invasive instrument for water content measurement in skin.
Aberg Peter
Baniasad Parisa
Hellstrom Per
Ollmar Stig
Aberg Peter
Baniasad Parisa
Blake Cassels & Graydon Llp
Hellstrom Per
Ollmar Stig
LandOfFree
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