Patent ID: 6529767
Filing Date: 2003-03-04
Classification: A61B,G01N

Abstract:
A method for measuring skin moisture of test skin, comprising the steps of:measuring a set of reference skin moisture values on a plurality of sample skins by using a conventional skin moisture measuring device; radiating near infrared light having a continuous wavelength ranging from 1100 nm to 1750 nm on the plurality of sample skins; detecting a set of near infrared reflectance spectra reflecting from the plurality of sample skins; dividing the set of near infrared reflectance spectra into a calibration set and a validation set by random selection; analyzing, with multivariate regression, the calibration set and the set of reference moisture value to produce a set of standard calibration equation data of the plurality of sample skins; correcting the set of standard calibration equation data using the validation set; storing the set of corrected standard calibration equation data at a memory; radiating near infrared light having a continuous wavelength ranging from 1100 nm to 1750 nm on the test skin; detecting a near infrared reflectance spectrum reflecting from the test skin at a predetermined wavelength interval; and predicting the skin moisture of the test skin from the detected near infrared reflectance spectra from the test skin by using the stored standard calibration equation data.