US 12,385,769 B2
Optical device and method for measuring flow rate
Benjamin E. Kusters, Pleasant Prairie, WI (US)
Assigned to Fenwal, Inc., Lake Zurich, IL (US)
Filed by Fenwal, Inc., Lake Zurich, IL (US)
Filed on Jun. 28, 2022, as Appl. No. 17/851,452.
Claims priority of provisional application 63/217,588, filed on Jul. 1, 2021.
Prior Publication US 2023/0003564 A1, Jan. 5, 2023
Int. Cl. G01F 1/661 (2022.01); G01F 1/00 (2022.01); G01F 1/66 (2022.01); G01F 1/704 (2006.01); A61M 1/36 (2006.01)
CPC G01F 1/661 (2013.01) [G01F 1/00 (2013.01); G01F 1/662 (2013.01); G01F 1/704 (2013.01); A61M 1/3693 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of optically measuring a fluid flow rate in a fluid processing system, comprising:
optically monitoring fluid flow through a transparent portion of a tubing by measuring light reflectance of particles in the fluid;
calculating the natural log relating to the reflectance of particles in the fluid;
selecting two correlation curve coefficients based on a particulate value for the fluid which is input by a user; and
calculating a fluid flow rate related to the two correlation curve coefficients and the natural log of the reflectance.