US 12,440,107 B2
Method and device for offset compensation
Martin Hansson, Södra Sandby (SE); and Sara Bergsten, Lund (SE)
Assigned to Neola Medical AB, Lund (SE)
Appl. No. 18/262,550
Filed by Neola Medical AB, Lund (SE)
PCT Filed Jan. 27, 2022, PCT No. PCT/EP2022/051962
§ 371(c)(1), (2) Date Jul. 21, 2023,
PCT Pub. No. WO2022/162098, PCT Pub. Date Aug. 4, 2022.
Claims priority of application No. 2150086-3 (SE), filed on Jan. 27, 2021.
Prior Publication US 2024/0293030 A1, Sep. 5, 2024
Int. Cl. A61B 5/00 (2006.01); A61B 5/083 (2006.01)
CPC A61B 5/0075 (2013.01) [A61B 5/0084 (2013.01); A61B 5/0833 (2013.01); A61B 5/0836 (2013.01); A61B 2560/0223 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A method for rescaling a signal to remove an absorption offset from an optical measurement, said method comprising:
a first mode comprising:
measuring a first light signal from each of at least one light source located in a housing which has been transmitted through, or back-scattered from, a reference object located outside of said housing using an external detector;
measuring a second light signal from each of said at least one light source located in said housing using a reference detector;
calculating a scaling factor of each of said at least one light source using said detected first light signal and said detected second light signal; and
a second mode:
measuring a third light signal from each of said at least one light source located in said housing which has been transmitted through, or back-scattered from, a measurement object located outside of said housing using said external detector;
measuring a fourth light signal from each of said at least one light source located in said housing using a reference detector;
applying said scaling factor to each of said detected fourth light signal which is then subtracted from each of said detected third light signal transmitted through, or back-scattered from, said measuring object.