Abstract: Examples of fault location in a power transmission line connecting a first and a second terminal is described. In an example, arrival times of a first peak, a second peak, and a third peak of a travelling wave detected from measurements carried out at the first and second terminals is detected. A rise time associated with the first peak of the travelling wave is calculated. One of a first half and a second half of the power transmission line is identified, as having a fault, based on a comparison of the rise time. One of a first segment, a second segment, a third segment, and a fourth segment of the power transmission line is identified as having the fault. Length of the power transmission line is estimated. The fault location is estimated based on identification of one of the first, second, third, and fourth segments as having the fault.

Abstract: An embodiment circuit comprises high-side and low-side switches arranged between supply and reference nodes, and having an intermediate node. A switching control signal is applied with opposite polarities to the high-side and low-side switches. An inductive load is coupled between the intermediate node and one of the supply and reference nodes. Current sensing circuitry is configured to sample a first value of the load current flowing in one of the high-side and low-side switches before a commutation of the switching control signal, sample a second value of the load current flowing in the other of the high-side and low-side switches after the commutation of the switching control signal, sample a third value of the load current flowing in the other of the high-side and low-side switches after the second sampling, and generate a failure signal as a function of the first, second and third sampled values of the load current.

Abstract: Ferrimagnetic oscillator magnetometers do not use lasers to stimulate fluorescence emission from defect centers in solid-state hosts (e.g., nitrogen vacancies in diamonds). Instead, in a ferrimagnetic oscillator magnetometer, the applied magnetic field shifts the resonance of entangled electronic spins in a ferrimagnetic crystal. These spins are entangled and can have an ensemble resonance linewidth of approximately 370 kHz to 10 MHz. The resonance shift produces microwave sidebands with amplitudes proportional to the magnetic field strength at frequencies proportional to the magnetic field oscillation frequency. These sidebands can be coherently averaged, digitized, and coherently processed, yielding magnetic field measurements with sensitivities possibly approaching the spin projection limit of 1 attotesla/?{square root over (Hz)}. The encoding of magnetic signals in frequency rather than amplitude relaxes or removes otherwise stringent requires on the digitizer.

Abstract: A method may include positioning an eddy current probe proximate to a coated portion of an article. The coated portion of the article includes a conductive substrate and a ceramic coating overlying the conductive substrate. The method includes generating, using the eddy current probe, a first primary magnetic field to induce eddy currents in the coated portion of the article and measuring, using the eddy current probe, a strength of a first secondary magnetic field created by the eddy currents in the coated portion of the article to obtain a first secondary magnetic field measurement. The method includes determining, by a computing device, one or more properties or one or more changes in properties of the article based on the first secondary magnetic field measurement.

Abstract: An operation detection device includes an electrostatic sensor accommodated inside a casing and including a first conductor and a second conductor, and a controller electrically connected to the first conductor and the second conductor, and applies a voltage to each of the first conductor and the second conductor, to measure an electrostatic capacitance of each of the first conductor and the second conductor. The first conductor is arranged in and the second conductor is not arranged in a detection region in which an operating body is detected by the electrostatic sensor. The first conductor and the second conductor are arranged in a non-detection region in which the operating body is not detected.

Abstract: A system and a method for measuring a void fraction of an inside of a heat conduction member are provided. The system is used to measure the heat conduction member and includes: a heating device configured as a heat source to heat an evaporation end of the heat conduction member; a cooling device configured for cooling a condensation end of the heat conduction member; at least one pair of electrode pads respectively attached to two opposite surfaces of the heat conduction member; and an LCR meter electrically connected to the at least one pair of the electrode pads for measuring impedances of the heat conduction member. Each of the impedances is converted into the void fraction that corresponds to a measured position of the heat conduction member.

Abstract: A signal generator and a method for controlling the signal generator, capable of suppressing variation in the intensity of signals inputted to multiple devices under test are provided. An attenuation amount setting unit 15 sets a reference attenuation amount, obtained by subtracting the maximum amount of the losses stored in the cable loss storage unit 16 with respect to the cables 4a to 4f connected to the output ports 12a to 12f from a target attenuation amount, to the first attenuator 11, and sets an output attenuation amount, obtained by subtracting the losses stored in the cable loss storage unit 16 with respect to each of the cables 4a to 4f connected to the output ports 12a to 12f, from the maximum amount of the losses, to each of the second attenuators 14a to 14f.

Abstract: A method for inspecting a component made using an additive manufacturing process, the component having an internal conduit, is disclosed. In various embodiments, the method includes the steps of: attaching a fluid-blocking header to the component, the fluid-blocking header having an internal conformal surface configured to mate with an external conformal surface of the component; introducing a plugging media into the internal conduit; activating the fluid-blocking header to freeze the plugging media in a vicinity of the fluid-blocking header; pressurizing the internal conduit of the component; and analyzing a fluid flow characteristic at an outlet of the component to assess an occurrence of a blockage within the internal conduit.

Abstract: A four-terminal-pair AC quantum resistance dissemination bridge and related methods are provided. The bridge includes: a supply transformer IVD1, a Kelvin branch A1, a Wagner branch A0, the first and second current sources A2, A3, an injection inductive voltage divider A4, a ratio transformer IVD2, the first and second four-terminal AC resistor connection points Z1, Z2, chokes H, and null indicators D. An isolated inductive winding LO is wound along the ratio transformer IVD2 and supplies excitation current to primary winding of injection inductive voltage divider A4 to avoid the mutual influence among various balance networks and rapid balance of the bridge can be realized. By changing turn ratio of primary winding L3 and secondary winding L4 of the second inductive voltage divider T2, the phase shift can be realized through only one set of capacitors for imaginary part error compensation, the bridge with multiple frequency points can be obtained.

Abstract: A smart power transmission line inspection system, related to the technical field of robotic inspection. The smart power transmission line inspection system comprises an inspection robot, an activation/deactivation device, and a control and processing terminal. The activation/deactivation device is used for activating or deactivating the inspection robot according to an activation/deactivation instruction. The inspection robot is used for inspection along a power transmission line according to an inspection instruction, and the inspection robot is also used for obtaining inspection data and for transmitting the inspection data to the control and processing terminal, wherein the inspection instruction is a pre-set inspection instruction pre-set for the inspection robot, or the inspection instruction is sent by the control and processing terminal and received by the inspection robot.

Abstract: A current sensor arrangement includes a first conductor configured to conduct a first portion of a primary current in a current flow direction; a second conductor configured to conduct a second portion of the primary current in the current flow direction; and a magnetic sensor. The first and second conductor are coupled in parallel. The first current produces a first magnetic field as it flows through the first conductor and the second current produces a second magnetic field as it flows through the second conductor. The first conductor and the second conductor are separated from each other in a first direction that is orthogonal to the current flow direction, thereby defining a gap. The magnetic sensor is arranged in the gap such that the first conductor is arranged over a first portion of the magnetic sensor and the second conductor is arranged under a second portion of the magnetic sensor.

Abstract: A fault detection system has line current monitors. Each line current monitor couples to a line-phase of an electric power transmission system. Each line current monitor has a phase detector, a loop filter and a controlled oscillator, coupled as a phase locked loop. The phase detector has a rotating frame transform. The phase detector couples to a line-phase and provides in-phase and quadrature signals in a rotating frame, based on in-phase and quadrature signals proportional to current in the line-phase. One or more fault detection modules are coupled to the line current monitors through inter-phase communication of the in-phase and quadrature signals in a time frame rotating at the line frequency. The communication may have electrical isolation.

Abstract: A subsurface representation that includes geometry and material properties of subsurface geological formations may be generated. To compute the initial (pre-production) state of stress, gravitational forces and tectonic forces may be applied to the subsurface representation. These loads may result in stress and displacement fields within the subsurface representation. The stress field may be calibrated against available measurements. At this point, the subsurface representation may be reinitialized by resetting the displacements within the subsurface representation while maintaining the stress field.

Abstract: A method for checking and/or monitoring the use of a tire (1) mounted on a vehicle (7), comprises the following steps: acquisition, by a microphone (10) arranged inside the tire, of an acoustic response of said tire (1) obtained under the effect of a pulsed mechanical stress thereon, and processing of said response in the frequency domain, characterized in that said processing identifies, in the response in the frequency domain, two spectrum spikes situated on either side of a reference frequency corresponding to the first cavity mode of the tire and, as a function of the frequency deviation between the two duly identified spikes, determines information relating to at least one parameter of use of the tire.

Abstract: This invention discloses a method for measuring the rate of angular displacement, of a traveling object, using magnetic field sensing, said method comprising: measuring magnetic field intensity and/or changes in said magnetic field intensity, projected onto a magnetic field sensor coupled to said traveling object, each measurement being per orthogonal rotation axis to provide a magnetic field intensity value per axis and/or a change in magnetic field intensity per axis, as said object's orientation changes with time; determining, number of peaks, present in a measurement sample comprising a set of said measurements, of time duration; and computing said rate of angular displacement, for said traveling object, as a function of said determined number of peaks and said time duration.

Abstract: Systems and methods may be used to measure a frequency of a power delivery system and/or of a supply signal transmitted to a load. A system may record an input waveform, determine a frequency of the input waveform at a present time based at least in part on the input waveform and a derivative of the input waveform, and control an operation of a power delivery system based at least in part on the determined frequency.

Abstract: At a reference position within a first plane, a magnetic field to be detected has a first direction that changes within the first plane. A magnetic sensor includes an MR element. The MR element includes a magnetic layer having first magnetization that can change in direction within a second plane. The first plane and the second plane intersect at a dihedral angle ? other than 90°. The magnetic field to be detected can be divided into an in-plane component parallel to the second plane and a perpendicular component perpendicular to the second plane. The in-plane component has a second direction that changes with a change in the first direction. The direction of the first magnetization changes with a change in the second direction. A detection value depends on the direction of the first magnetization.

Abstract: The corrosion detection sensor detects corrosion to an electrical apparatus caused by a corrosive gas. The corrosion detection sensor includes a metal thin film to be corroded by the corrosive gas, a resistive element connected in series to the metal thin film, a resistance measuring instrument that measures a combined resistance of the metal thin film and the resistive element, and a notification unit that outputs a detection result indicating that the combined resistance measured by the resistance measuring unit is greater than a predetermined reference resistance. The reference resistance is determined according to a danger level indicating that the electrical apparatus is corrosively damaged by the corrosive gas.

Abstract: The present disclosure relates to integrated circuits, and, more particularly, to a magnetic field sensor using magnetic tunneling junction (MTJ) structures and passive resistors, and methods of manufacture and operation. The structure includes: a first portion of a circuit including a first MTJ structure and a first resistor coupled in series between a first voltage source and a second voltage source; and a second portion of the circuit including a second MTJ structure and a second resistor coupled in series between the first voltage source and the second voltage source. The first portion and the second portion are coupled in parallel between the first voltage source and the second voltage source.

Abstract: An apparatus includes a memory and a hardware processor communicatively coupled to the memory. The hardware processor receives, from a plurality of power supplies, a plurality of indications of electrical power disturbances detected by the plurality of power supplies and determines locations of the plurality of power supplies based on the plurality of indications. The hardware processor also determines, based on the plurality of locations, an event that caused the electrical power disturbances and classifies the event based on the location of the plurality of power supplies.