US 12,076,157 B2
Method and device for determining a degree of damage of hair, and method for determining a user-specific hair treatment agent
Georg Knuebel, Duesseldorf (DE); Meike Voss-Klimke, Langenfeld (DE); Oliver Seiler, Duesseldorf (DE); Ludger Buetfering, Nideggen-Rath (DE); Asrtid Kroos, Monheim (DE); and Annika Koenen, Grevenbroich (DE)
Assigned to HENKEL AG & CO. KGAA, Duesseldorf (DE)
Appl. No. 16/311,873
Filed by Henkel AG & Co. KGaA, Duesseldorf (DE)
PCT Filed Jul. 4, 2017, PCT No. PCT/EP2017/066572
§ 371(c)(1), (2) Date Dec. 20, 2018,
PCT Pub. No. WO2018/007353, PCT Pub. Date Jan. 11, 2018.
Claims priority of application No. 10 2016 212 202.9 (DE), filed on Jul. 5, 2016.
Prior Publication US 2019/0192067 A1, Jun. 27, 2019
Int. Cl. A61B 5/00 (2006.01); A45D 44/00 (2006.01); A61B 5/103 (2006.01); A61B 5/145 (2006.01); A61B 5/1455 (2006.01); G01J 3/02 (2006.01); G01N 21/359 (2014.01); G16H 20/00 (2018.01); G01J 3/28 (2006.01)
CPC A61B 5/448 (2013.01) [A45D 44/00 (2013.01); A61B 5/0075 (2013.01); A61B 5/1032 (2013.01); A61B 5/7246 (2013.01); G01J 3/0272 (2013.01); G16H 20/00 (2018.01); A45D 2044/007 (2013.01); A61B 2503/12 (2013.01); A61B 2560/0223 (2013.01); G01J 3/28 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for determining a degree of damage of hair, comprising the following steps:
during exposure of a hair sample to near-infrared or infrared light, recording a spectrum of at least part of the near-infrared or infrared light, respectively, that has interacted with the hair sample;
comparing at least part of the spectrum with a spectroscopic calibration model obtained by near-infrared (NIR) or infrared (IR) spectra and degrees of damage of a plurality of calibration hair samples; and
determining the degree of damage of the hair on consideration of the comparison,
wherein the spectroscopic calibration model is created by:
(i) for each of the plurality of calibration hair samples:
during the exposure of each calibration hair sample to NIR or IR light, recording a calibration spectrum of at least part of the NIR or IR light, respectively, that has interacted with the calibration hair sample,
determining the degree of damage of the calibration hair sample by a determination of a cysteic acid content, and
allocating the degree of damage to the calibration spectrum; and
(ii) determining a correlation between the plurality of calibration spectra and the plurality of degrees of damage,
wherein the determination of the cysteic acid content comprises a chromatographic process.