US 12,332,212 B2
Method for characterizing the gas load of a medium, and density meter therefor
Hao Zhu, Freising (DE); Yaoying Lin, Freising (DE); and Andreas Güttler, Zolling (DE)
Assigned to Endress+Hauser Flowtec AG, Reinach (CH)
Appl. No. 17/757,496
Filed by Endress+Hauser Flowtec AG, Reinach (CH)
PCT Filed Dec. 1, 2020, PCT No. PCT/EP2020/084083
§ 371(c)(1), (2) Date Jun. 16, 2022,
PCT Pub. No. WO2021/121961, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 102019135299.1 (DE), filed on Dec. 19, 2019.
Prior Publication US 2023/0026350 A1, Jan. 26, 2023
Int. Cl. G01N 29/036 (2006.01)
CPC G01N 29/036 (2013.01) [G01N 2291/02433 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for characterizing a gas load of a medium, which comprises a liquid loaded with gas, the method comprising:
providing a measurement sensor comprising at least one vibrating measurement tube, the measurement sensor configured to guide the medium through the at least one measurement tube;
determining a measured pressure value for the medium guided in the at least one measurement tube;
determining natural frequencies of at least two different vibration modes of the at least one measurement tube;
determining a speed of sound value and a resonator density value of the medium based on the natural frequencies of the at least two different vibration modes of the at least one measurement tube;
determining a gas volume content of suspended bubbles in the medium based on the resonator density value, the speed of sound value, and the measured pressure value; and
determining a value for the gas volume content of free bubbles as a function of the resonator density value of the medium and as a function of the gas volume content of the suspended bubbles,
wherein the value for the gas volume content of the free bubbles is proportional to a difference between an expected value of a density of the medium and the resonator density value,
wherein the expected value of the medium density is based on a reference density value of the liquid and on the gas volume content of the suspended bubbles, and
wherein, to determine the value for the gas volume content of the free bubbles, the difference is divided by a product of the expected value of the medium density and a correction factor, wherein the correction factor is not less than 1 and not greater than 4.