US 12,411,100 B2
Device and method for ascertaining a property of a fluid, fluid container and vehicle
Stefan Dilger, Donaueschingen (DE)
Assigned to AST (ADVANCED SENSOR TECHNOLOGIES) INTERNATIONAL ASSET GMBH., Calw (DE)
Appl. No. 17/922,467
Filed by AST (ADVANCED SENSOR TECHNOLOGIES) INTERNATIONAL ASSET GMBH, Calw (DE)
PCT Filed Apr. 28, 2021, PCT No. PCT/EP2021/061124
§ 371(c)(1), (2) Date Oct. 31, 2022,
PCT Pub. No. WO2021/219709, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 10 2020 111 862.7 (DE), filed on Apr. 30, 2020; application No. 10 2020 115 467.4 (DE), filed on Jun. 10, 2020; and application No. 10 2020 131 192.3 (DE), filed on Nov. 25, 2020.
Prior Publication US 2023/0168215 A1, Jun. 1, 2023
Int. Cl. G01N 25/18 (2006.01); G01N 27/06 (2006.01)
CPC G01N 25/18 (2013.01) [G01N 27/06 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A device for ascertaining a property of a fluid, having:
an electric conductor assembly which is designed to be at least partly brought into contact with the fluid and which is designed as a voltage divider with two elements, wherein the first element is a first conductor which, at least in a current-conducting state, has a resistance value that differs from that of the second element;
a measuring bridge with two voltage dividers connected in parallel, one of the voltage dividers being formed by the electric conductor assembly;
an actuation unit for applying an AC voltage to the measuring bridge;
a voltage detection unit for detecting a bridge voltage of the measuring bridge; and
an analysis unit which is configured to ascertain a thermal conductivity as the property of the fluid by analyzing the bridge voltage using the 3-omega method,
wherein
the first conductor is formed as a wire.