公开(公告)号：US20200209028A1

公开(公告)日：2020-07-02

申请号：US16574174

申请日：2019-09-18

Applicant: Keyence Corporation

Inventor： Hiroki MATSUI ,  Masaki WADA

IPC: G01F1/66

Abstract: A clamp-on type ultrasonic flowmeter which is detachably attached to an outer wall of cylindrical piping is provided. An ultrasonic signal is transmitted to the piping from one of the first and the second ultrasonic devices, a plate wave corresponding to the ultrasonic signal is generated, and an ultrasonic signal corresponding to the plate wave is received by the other ultrasonic device. A pipe wall thickness of the piping and a frequency of the ultrasonic signal are in a state in which a plate wave of a low order asymmetric mode is significantly excited in the piping. A flow rate is calculated corresponding to phase velocity characteristics of the low order asymmetric mode.

公开(公告)号：US20190011303A1

公开(公告)日：2019-01-10

申请号：US16002446

申请日：2018-06-07

Applicant: Keyence Corporation

Inventor： Yohei HASHIMOTO ,  Satoru TOMOSHI ,  Hiroki MATSUI

IPC: G01F15/06 ,  G01F1/66 ,  G01F15/00

Abstract: Provided is a flow meter capable of logging data more reliably. In this operation, a detection element repeatedly detects a physical quantity related to a flow rate of a fluid flowing in a pipe in a predetermined sampling cycle. Based on physical quantities, a calculation part sequentially calculates the flow rate of the fluid in the pipe. Further, a time measurement part calculates the time. A control storage part is caused to store a logging target, a logging cycle, and logging start definition information. Based on the logging start definition information, a control part automatically starts logging of the logging target in response to startup of the flow meter, and causes a log storage part to store the time measured by the time measurement part and a numerical value of the logging target in association with each other in every logging cycle.

公开(公告)号：US20240125634A1

公开(公告)日：2024-04-18

申请号：US18372102

申请日：2023-09-24

Applicant: Keyence Corporation

Inventor： Hiroki MATSUI ,  Shinichiro OTSU

IPC: G01F1/66 ,  G01F1/667 ,  G01F15/14

CPC classification number: G01F1/662 ,  G01F1/667 ,  G01F15/14

Abstract: To enable accurate measurement when a flow rate is measured using an ultrasonic signal. An ultrasonic flowmeter includes a first ultrasonic element and a second ultrasonic element, a damping pipe, a first ultrasonic propagator and a second ultrasonic propagator, which are arranged outside the damping pipe, and a flow rate measurement unit that measures a flow rate based on an ultrasonic signal transmitted and received between the first ultrasonic element and the second ultrasonic element. The first ultrasonic element, the first ultrasonic propagator, the damping pipe, the second ultrasonic element, and the second ultrasonic propagator are accommodated in a housing.

公开(公告)号：US20240125635A1

公开(公告)日：2024-04-18

申请号：US18372105

申请日：2023-09-24

Applicant: Keyence Corporation

Inventor： Hiroki MATSUI ,  Daiki MATSUMOTO ,  Ryuma MIYAKE

IPC: G01F1/66 ,  G01F15/18

CPC classification number: G01F1/662 ,  G01F15/185

Abstract: To enable accurate measurement of a flow rate of a gas flowing in a non-metallic tube. An ultrasonic flowmeter includes a first wedge member having a first angle, a second wedge member having a second angle, and a flow rate measurement unit that measures a flow rate of a gas based on a propagation time difference of a longitudinal wave excited by a tube. The first angle and the second angle are configured such that the tube excites both a longitudinal wave and a shear wave, and a mixing ratio of the shear wave to the longitudinal wave is 10% or less.