US 12,031,902 B2
Method for contactless characterization of a substance
Markus Grafen, Witten (DE)
Assigned to Steinfurth Mess-Systeme GmbH, Essen (DE)
Appl. No. 17/297,246
Filed by Steinfurth Mess-Systeme GmbH, Essen (DE)
PCT Filed Apr. 7, 2020, PCT No. PCT/EP2020/059885
§ 371(c)(1), (2) Date May 26, 2021,
PCT Pub. No. WO2020/208012, PCT Pub. Date Oct. 15, 2020.
Claims priority of application No. 10 2019 109 583.2 (DE), filed on Apr. 11, 2019.
Prior Publication US 2022/0026349 A1, Jan. 27, 2022
Int. Cl. G01N 21/27 (2006.01); G01N 21/3504 (2014.01); G01N 21/90 (2006.01)
CPC G01N 21/274 (2013.01) [G01N 21/3504 (2013.01); G01N 21/90 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for contactless characterization of a substance using waves,
wherein the substance comprises a spectral structure as a characteristic field which qualitatively depends on at least one property of the substance,
wherein the spectral structure is recorded by a plurality of measurements, and
wherein the plurality of measurements comprise interference structures that depend on the measurement circumstances,
wherein
in step 1), at least two different measurements of the plurality of measurements are carried out under different measurement circumstances, which have at least quantitatively or qualitatively different interference structures or quantitatively different spectral structures,
and that in step 2), coefficients of a linear combination of the different measurements and the value of the at least one property of the substance are optimized so that a deviation between the linear combination and the spectral structure is minimized.