41 results about "EMF measurement" patented technology

Provided is an apparatus caused at least to: acquire a set of Earth's magnetic field, EMF, measurement results, wherein each EMF measurement result represents at least one of a magnitude and a direction of the EMF as experienced by a mobile device; perform, on the basis of the set of EMF measurement results, a first observation indicating that the mobile device is currently in motion; acquire a set of inertial measurement results, wherein each inertial measurement result represents at least one of acceleration and angular velocity experienced by the mobile device; perform, on the basis of the set of inertial measurement results, a second observation indicating that the motion of the mobile device does not exceed a predefined stationarity threshold; and determine, on the basis of the first and second observations, that the mobile device is currently located in a transport unit which is moving with respect to surrounding environment.

A magnetic flow metering device and method is disclosed for the measurement of corrosive flow streams. The device utilizes a unibody construction wherein the flow conduit is constructed entirely from an insulative, non-conducting material without resorting to a metallic outer housing. The portions of the electrodes in contact with the flow stream are made of a suitable conductive polymer material, resistant to the corrosive media. The electrodes also feature shields that are molded into the electrode assembly to reduce background electrical noise. The invention also utilizes an electrical configuration that actively drives the electrode shield circuit (electrodes as well as cabling) to provide a more accurate measurement of the electromotive force.

The invention relates to an electromagnetic flowmeter for non-full pipe flow measurement, comprising an electromagnetic flow transducer, an electrical impedance measurement module, an induced electromotive force measurement module and a control and signal processing module. The electromagnetic flowmeter is characterized in that the electromagnetic flow transducer comprises a measuring pipe, an electrode and a magnet exciting coil; the electrical impedance measurement module includes a multi-way switch group (A), an excitation signal source circuit and an electrical impedance measurement circuit; the induced electromotive force measurement module comprises a multi-way switch group (B), an exciting circuit and an induced electromotive force measurement circuit; and the control and signal processing module is in charge of controlling the multi-way switch groups, the electrical impedance measurement module is used for obtaining a plurality of groups of electrical impedance values, and the induced electromotive force measurement module is used for obtaining a plurality of groups of induced electromotive force values, so that the flow rate inside a pipe can be obtained under the conditions of full pipe and non-full pipe. The electromagnetic flowmeter can realize accurate measurement of the flow rate without calibrating different fluid mediums in a state of non-full pipe flow.

A motor torque measurement system includes a motor in communication with a gyro, a centrifuge rotor connected to the gyro, a housing surrounding the rotor and motor, and a controller in communication with the motor. The controller is connected to a back EMF measurement device, which measures the back EMF of the motor, and is also configured to measure motor rotational speed. The back EMF coefficient (Ke) and motor torque constant (Kt) can be calculated therefrom and the actual motor performance thereby determined. Motor magnet temperature may also be calculated. Back EMF and motor rotational speed measurements may be taken with the motor coasting.

There is provided an apparatus, comprising: at least one processor and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus at least to: perform a set of Earth's magnetic field, EMF, measurements inside a building, wherein each EMF measurement result represents at least one of a magnitude and a direction of the EMF in the building;store the set of EMF measurement results off-line into a memory buffer coupled to the apparatus; and upon detecting a predefined triggering condition, cause a transfer of the stored set of EMF measurement results to a database entity.

A Hall resistance measurement unit measures a Hall resistance value in two or more current directions between a plurality of terminals of the Hall element. A Hall electromotive force measurement unit measures the Hall electromotive force of the Hall element. A temperature measurement unit measures an operating temperature of the Hall element. A compensation signal generation unit compensates the Hall electromotive force on the basis of the Hall resistance value from the Hall resistance measurement unit and a temperature output value from the temperature measurement unit. A compensation coefficient calculation circuit calculates a compensation coefficient on the basis of the Hall resistance value measured by the Hall resistance measurement unit and the temperature output value measured by the temperature measurement unit. The compensation coefficient includes a mechanical stress compensation coefficient and a temperature compensation coefficient.

The invention discloses a method and a device for measuring slag-iron liquid level information of a hearth of a blast furnace online. High-precision electromotive force signals produced by electromotive force measuring points are used as measuring parameters, a computer system performs procedure code analysis on data of different air ports and different tap holes, and liquid level and dead stock information of the hearth is obtained. The measuring basis is change of heat transfer of a refractory material of the hearth and a furnace shell due to different heat storage capacity of slag-iron, and the measuring value is heat transferred by the refractory material and the furnace shell. The computer system responsible for code processing is used as a data visualization system, the inside of each electromotive force measuring point comprises a resistor, a measuring probe and a circuit, and the electromotive force produced by each electromotive force measuring point is directly analyzed and calculated. With the measuring method and device, the change of the liquid level in the hearth is mastered in real time, the blast furnace is guided to discharge iron and slag timely, and monitoring on the basis of daily operation and realizing of stability and long life of the hearth can be facilitated.

The invention relates to a superheat degree measurement method implemented based on the seebeck effect. The method comprises the steps that firstly, the input end and the output end of an evaporator pipeline in a refrigerating cycle are connected into electrodes, and therefore the electrodes and the evaporator pipeline make tight contact and form a loop, wherein the electrodes are made of materials which contain metal materials and are different from the materials of the evaporator pipeline; then the electromotive force between the electrodes is measured; finally, the measured electromotive force is converted into temperature difference on the basis of the seebeck effect. The invention further relates to a superheat degree measurement device. The superheat degree measurement device comprises the two electrodes and an electromotive force measurer, wherein the two electrodes are made of materials which contain the metal materials and are different from the materials of the evaporator pipeline in the refrigerating cycle. The two electrodes are connected to the input end and the output end of the evaporator pipeline respectively, and therefore the electrodes and the evaporator pipeline make tight contact to form the loop. The electromotive force measurer is connected with the two electrodes. The superheat degree measurement method and device are achieved based on the seebeck effect, the superheat degree of the refrigerating cycle is achieved with high precision and reliability, and the cost can be significantly reduced.

In an imaging apparatus having a toner container, a method of periodically calibrating a back EMF constant Ke used in a speed control circuit of a DC motor used for driving for a toner metering device. To adjust the value of the back EMF constant Ke, the method uses a plurality of sampled back EMF measurements together with a calculated actual speed of rotation of the toner metering device as measured using motion sensor.

The invention relates to an electromagnetic flowmeter for non-full pipe flow measurement, comprising an electromagnetic flow transducer, an electrical impedance measurement module, an induced electromotive force measurement module and a control and signal processing module. The electromagnetic flowmeter is characterized in that the electromagnetic flow transducer comprises a measuring pipe, an electrode and a magnet exciting coil; the electrical impedance measurement module includes a multi-way switch group A, an excitation signal source circuit and an electrical impedance measurement circuit; the induced electromotive force measurement module comprises a multi-way switch group B, an exciting circuit and an induced electromotive force measurement circuit; and the control and signal processing module is in charge of controlling the multi-way switch group A and the multi-way switch group B, the electrical impedance measurement module is used for obtaining a plurality of groups of electrical impedance values, and the induced electromotive force measurement module is used for obtaining a plurality of groups of induced electromotive force values, so that the flow rate inside a pipe can be obtained under the conditions of full pipe and non-full pipe. The electromagnetic flowmeter can realize accurate measurement of the flow rate without calibrating different fluid mediums in a state of non-full pipe flow.

Entrainment fluid detection diagnostics. A magnetic flowmeter includes at least one coil configured to generate a magnetic field in a process fluid flow. The electrode pair is configured to detect an electromotive force generated in the flowing process fluid in response to the magnetic field. A measurement circuit is coupled to the pair of electrodes and configured to provide an indication of the detected electromotive force. A processor is coupled to the measurement circuit and configured to receive an indication of the detected electromotive force and determine a flow-related output based on the detected electromotive force. The diagnostic assembly is configured to analyze a number of continuous parameters of the magnetic flowmeter to provide an indication of detected entrained fluid.