Yokogawa Electric Corporation

Minako Terao

Kazuma Takenaka

Kotaro Ogawa

Naoki Noguchi

Saki Kobako

Yoshiaki Tanaka

Tetsuya Ishikawa

Hiroaki Tanaka

Satoshi Kato

Yukiyo Akisada

Nobuo Okabe

Kazunori Miyazawa

Yosuke Ishii

Satoshi Yoshitake

Sho Fujita

Fumitake Terao

Ken'ichi Kamada

A current measurement device (to) includes a first sensor (SE) configured to detect a direct current magnetic field and a low-frequency alternating current magnetic field generated by a current (I) flowing through a measurement target conductor (MC), a hollow magnetic shielding member () that includes a cutout portion (CP) into which the measurement target conductor is inserted and in which the first sensor is accommodated, a fixing mechanism () configured to fix the measurement target conductor such that a distance between a center of the measurement target conductor inserted into the cutout portion of the magnetic shielding member and the first sensor is a predetermined reference distance (r), and a first calculator () configured to calculate a current flowing through the measurement target conductor based on a detection result of the first sensor.

Current measurement device

A current measurement device includes: four or more triaxial magnetic sensors arranged to have predefined positional relationships such that magnetism-sensing directions thereof are parallel to each other; and a calculator configured to calculate currents flowing through a pair of conductors to be measured, which are arranged in proximity to each other, based on detection results of the four or more triaxial magnetic sensors and the positional relationships between the four or more triaxial magnetic sensors, the currents flowing in mutually opposite directions.

Current measurement device for measuring currents flowing in mutually opposite directions

The current measurement device () includes a first sensor (SE) configured to detect a direct current magnetic field and a low-frequency alternating current magnetic field generated due to the current () flowing through the conductor (MC) to be measured, a second sensor (SE) configured to detect alternating current magnetic fields from a low frequency to a high frequency generated due to the current (I) flowing through the conductor to be measured, a first calculator (A) configured to calculate the current flowing through the conductor to be measured from a detection result of the first sensor using distance information indicating a distance (r) between the first sensor (SE) and the conductor (MC) to be measured, a second calculator () configured to calculate the current flowing through the conductor to be measured from a detection result of the second sensor, and a synthesizer () configured to synthesize a calculation result of the first calculator with a calculation result of the second calculator.

Current measurement device, current measurement method, and non-transitory computer readable storage medium

A current measurement device (and) is for measuring a current (I) flowing through measurement target conductors (MCand MC), and the current measurement device includes: a plurality of triaxial magnetic sensors (, and) disposed so that a magnetic sensing direction and a relative position have a prescribed relationship; a noise remover () configured to remove noise components included in detection results of the plurality of triaxial magnetic sensors; a sign adder () configured to add a sign to the detection results from which the noise components have been removed, based on sign information of each of the detection results of the plurality of triaxial magnetic sensors obtained at a specific point in time; and a current calculator (and) configured to calculate a current flowing through the measurement target conductors by using the detection results to which the sign has been added by the sign adder.

A current measuring device () includes two triaxial magnetic sensors () that are arranged with a prescribed gap between the two triaxial magnetic sensors () such that magnetic-sensing directions of the two triaxial magnetic sensors () are parallel to each other, and a calculator configured to calculate a current (I) flowing in a measurement-object conductor (MC) based on detection results from the two triaxial magnetic sensors () and a gap between the two triaxial magnetic sensors ().

Current measuring device, current measuring method, and non-transitory computer-readable storage medium

An ultrasonic pipe measurement apparatus includes: a plurality of ultrasonic transceivers discretely disposed on a pipe wall of a pipe; and a control unit configured to control the plurality of ultrasonic transceivers and detect a generation point of damage caused in the pipe based on an ultrasonic signal exchanged between the ultrasonic transceivers.

Ultrasonic pipe measurement apparatus

A micro flow sensor includes: a flow path through which a fluid to be measured flows; a detection unit having a heater configured to heat the fluid to be measured in the flow path and temperature sensors configured to measure temperature of a fluid to be measured in the flow path; an arithmetic unit configured to measure a flow rate of the fluid to be measured flowing through the flow path based on the temperature of the fluid to be measured, measured by the temperature sensors; and a narrowed portion disposed on an upstream side of the detection unit in the flow path for narrowing the flow path.

Micro flow sensor

An ultrasonic flowmeter includes a plurality of ultrasonic wave elements attached to an outer wall of a pipeline through which a measurement target fluid flows, and configured to transmit and receive an ultrasonic signal, wherein at least one of the ultrasonic wave elements is an ultrasonic wave transmission element and is attached to the outer wall of the pipeline so that an ultrasonic wave transmission surface thereof is in parallel to a pipe axis direction of the pipeline, and another at least one of the ultrasonic wave elements is an ultrasonic wave reception element and is attached to the outer wall of the pipeline so that an ultrasonic wave reception surface thereof is in parallel to the pipe axis direction of the pipeline.

Growing community of inventors

Tokyo, Japan

Minako Terao