US 12,292,319 B2
Propagation time measurement device
Yoshitaka Tsurukame, Kyoto (JP); Yui Ishida, Kyoto (JP); and Masaki Yawata, Kyoto (JP)
Assigned to OMRON CORPORATION, Kyoto (JP)
Appl. No. 18/006,397
Filed by OMRON Corporation, Kyoto (JP)
PCT Filed Jul. 20, 2021, PCT No. PCT/JP2021/027198
§ 371(c)(1), (2) Date Jan. 23, 2023,
PCT Pub. No. WO2022/030251, PCT Pub. Date Feb. 10, 2022.
Claims priority of application No. 2020-135276 (JP), filed on Aug. 7, 2020.
Prior Publication US 2023/0324208 A1, Oct. 12, 2023
Int. Cl. G01F 1/667 (2022.01); G01F 1/66 (2022.01); G01F 25/10 (2022.01)
CPC G01F 1/667 (2013.01) [G01F 1/662 (2013.01); G01F 25/10 (2022.01)] 12 Claims
OG exemplary drawing
 
1. A propagation time measurement device, comprising:
a plurality of transducers at different positions with respect to a pipe through which a fluid flows, the plurality of transducers including a first transducer configured to convert a transmission signal as an electrical signal to an acoustic signal and a second transducer configured to receive the acoustic signal transmitted from the first transducer through the fluid in the pipe and convert the received acoustic signal to a reception signal as an electrical signal; and
a signal processor configured to remove reverberation from the reception signal and determine a propagation time of the acoustic signal from the first transducer to the second transducer by cross-correlation analysis between the transmission signal and the reception signal from which the reverberation has been removed,
wherein the signal processor
determines a propagation time of the acoustic signal from the first transducer to the second transducer by cross-correlation analysis between the transmission signal and the reception signal from which the reverberation has yet to be removed,
removes, as the reverberation, a signal component at and after a time point based on the determined propagation time, and
redetermines the propagation time of the acoustic signal from the first transducer to the second transducer by cross-correlation analysis between the transmission signal and the reception signal from which the reverberation has been removed.