US 11,725,968 B2
Measurement of absolute time of flight in an ultrasonic meter using received and reflected waves
Ralf Heinrich Schröder genannt Berghegger, Glandorf (DE); Andreas Wuchrer, Georgsmarienhütte (DE); Tobias Meimberg, Osnabrück (DE); Christian Lampe-Jürgens, Spelle (DE); and Norbert Flerage, Löningen (DE)
Assigned to Honeywell International Inc., Charlotte, NC (US)
Filed by Honeywell International Inc., Morris Plains, NJ (US)
Filed on Mar. 29, 2021, as Appl. No. 17/215,160.
Claims priority of provisional application 63/036,185, filed on Jun. 8, 2020.
Prior Publication US 2021/0381864 A1, Dec. 9, 2021
Int. Cl. G01F 1/66 (2022.01); G01F 1/667 (2022.01)
CPC G01F 1/662 (2013.01) [G01F 1/667 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method of measuring time of flight, comprising:
correlating a signal comprising a reflected signal from a first transducer to a second transducer, or a subsequent reflected signal at the first transducer or the second transducer, with a previously received signal to produce a correlation for a measurement of a time of flight; and
measuring an absolute time of flight based on the correlation, wherein the absolute time of flight is proportional to a distance between the first transducer and the second transducer divided by a speed of sound or a speed of light.