Yokogawa Electric Corporation

Kazuma Takenaka

Naoki Noguchi

Kotaro Ogawa

Minako Terao

Saki Kobako

Tetsuya Ishikawa

Satoshi Yoshitake

Yukihiro Shintani

Yoshiaki Tanaka

Satoshi Kato

Nobuo Okabe

Sho Fujita

Nobuhiro Tomosada

Shinya Kato

Shinya Mito

Shumpei Ito

Fumitake Terao

Taro Kemmotsu

A magnetic detection apparatus according to the present disclosure includes a magnetic sensor and a measurement apparatus. The magnetic sensor includes a first transmission line and a second transmission line arranged to be non-parallel to each other. The measurement apparatus includes a signal generator configured to generate a first incident wave and a second incident wave, a signal detector configured to detect a first reflected wave caused by an impedance mismatch of the first transmission line and a second reflected wave caused by an impedance mismatch of the second transmission line, and a controller. The controller calculates a first magnetic field based on the first incident wave and the first reflected wave and a second magnetic field based on the second incident wave and the second reflected wave and calculates a biaxial magnetic field based on the first magnetic field and the second magnetic field.

Magnetic detection apparatus, magnetic sensor, and magnetic detection method

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

The magnetic detectoraccording to the present disclosure includes a transmission linehaving a linear first conductorincluding a magnetic material, a signal generatorconfigured to input a pulse as an incident wave to the transmission line, and a calculatorconfigured to detect a reflected wave caused by impedance mismatching at a magnetic field application position of the transmission lineand the incident wave. The calculatorcalculates a position and a strength of the magnetic field applied to the transmission lineon the basis of the incident wave and the reflected wave.

Magnetic detector, transmission line and magnetic detection method

An absolute thickness distribution cannot be accurately calculated with a conventional technique. A sensor device is provided that includes a plurality of magnetic sensors arranged to face an outer circumference surface of a pipeline and ultrasonic sensors arranged to face the outer circumference surface and measure a thickness of the pipeline in a measurement region in which the plurality of magnetic sensors measure a magnetic field, the ultrasonic sensors being less than the plurality of magnetic sensors.

Pipeline thickness measurement sensor device

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 magnetism detection device includes: a transmission line set having a transmission line including a linear first conductor including a magnetic material; and a detector that: inputs, from a first end of the transmission line set, a pulse signal as a first incident wave and detects, at the first end, a first reflected wave of the first incident wave; inputs, from a second end opposite to the first end, a pulse signal as a second incident wave and detects, at the second end, a second reflected wave of the second incident wave; and detects a strength of a magnetic field applied to the transmission line set based on compositing of the first reflected wave and the second reflected wave.

Magnetism detection device and magnetism detection method

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

A facility diagnosis device includes: a process data acquirer that acquires process data indicating a state of a process executed in a plant; a production data acquirer that acquires production data indicating a production state in the plant; a state information generator that generates state information for estimating an operation state of a facility operating in the process based on the acquired process data or the acquired production data, or the process data and the production data; and a determiner that determines the operation state of the facility based on the acquired process data or the generated state information and the acquired production data.

Facility diagnosis device, facility diagnosis method, and facility diagnosis program

A current measurement device includes a low frequency measurement sensor configured to measure a magnetic field, a high frequency measurement sensor configured to measure the magnetic field and configured to generate a magnetic field for canceling the magnetic field applied to the low frequency measurement sensor, a magnetism sensing direction of the low frequency measurement sensor and a magnetism sensing direction of the high frequency measurement sensor being substantially parallel to each other, a negative feedback circuit configured to control a current flowing through the high frequency measurement sensor based on the magnetic field measured by the low frequency measurement sensor, a low pass filter configured to adjust a frequency characteristic of the current controlled by the negative feedback circuit, and an outputter configured to output a measurement value of the current to be measured based on the current flowing through the high frequency measurement sensor.

A current sensor includes: four magnetic sensor elements arranged within a plane orthogonal to a measured current, having a symmetrical magnetic characteristics curve, and adapted to convert a magnitude of a magnetic field into an electrical signal and output the electrical signal; a bridge circuit including the four magnetic sensor elements; and a bias magnetic field application member adapted to applying a bias magnetic field to the magnetic sensor elements.

Current sensor

A pH sensor may include a reference electrode including a p-channel field effect transistor (FET) whose gate includes a diamond surface having a hydrogen ion insensitive terminal, and a working electrode.

PH sensor, pH measurement method, ion sensor, and ion concentration measurement method

A force detection device includes a diamond piezoresistor including a highly orientated diamond into which boron is introduced as an impurity. The absolute value of the piezoresistance coefficient of the diamond piezoresistor is greater than the absolute value of a piezoresistance coefficient &#x3c0;11 or &#x3c0;12 in a case in which a major axis is in the &#x3c;100&#x3e; direction.

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Tokyo, Japan

Kazuma Takenaka