Abstract: A magnetic resonance (MR) system comprises a main magnetic field and an RF power amplifier for generating an RF field in a first RF band, the arrangement further comprising at least one magnetic field probe (2), said magnetic field probe comprising a MR active probe substance, means for pulsed MR excitation of said probe substance (4) in a second RF band and means for receiving a probe MR signal in the second RF band generated by said probe substance. In order to improve performance of the system, the latter comprises means for recording the output signal of the RF power amplifier in said second RF band, and means for subtracting from said probe MR signal an interfering signal contribution contained in said recorded RF amplifier output signal.

Abstract: A light-trapping geometry enhances the sensitivity of strain, temperature, and/or electromagnetic field measurements using nitrogen vacancies in bulk diamond, which have exterior dimensions on the order of millimeters. In an example light-trapping geometry, a laser beam enters the bulk diamond, which may be at room temperature, through a facet or notch. The beam propagates along a path inside the bulk diamond that includes many total internal reflections off the diamond's surfaces. The NVs inside the bulk diamonds absorb the beam as it propagates. Photodetectors measure the transmitted beam or fluorescence emitted by the NVs. The resulting transmission or emission spectrum represents the NVs' quantum mechanical states, which in turn vary with temperature, magnetic field strength, electric field strength, strain/pressure, etc.

Abstract: A magnetic sensor includes first and second yokes, first and second magnetoresistive elements, and a current path for passing a current through the first and second magnetoresistive elements. Each of the first and second yokes receives an input magnetic field containing an input magnetic field component in a direction parallel to a first virtual straight line Lz, and generates an output magnetic field. The output magnetic field contains an output magnetic field component in a direction parallel to a second virtual straight line Lx orthogonal to the first virtual straight line Lz. The first and second magnetoresistive elements generate respective detection values corresponding to the output magnetic field components of the output magnetic fields generates by the first and second yokes. The first and second yokes are electrically continuous with the first and second magnetoresistive elements, respectively.

Abstract: An array electromagnetic tool is run in a borehole, and resulting signals are processed to provide at least one of real and imaginary conductivity components, ?R* and ?I*. The at least one of real and imaginary conductivity components is compared to a corresponding representative conductivity component of a plurality of different clay groups and a determination of clay type in the formation is made therefrom.

Abstract: A secondary battery system includes: a secondary battery having an electrode containing an active material; and an electronic control unit configured to execute an SOC estimation process of estimating an SOC of the secondary battery. The electronic control unit is configured to: i) calculate the surface stress from a use history of the secondary battery; ii) calculate the amount of change in OCV from the calculated surface stress iii) correct an estimated OCV with the use of the amount of change in OCV; the estimated OCV being estimated from a voltage value and current value of the secondary battery; and iv) estimate an SOC corresponding to the corrected estimated OCV as the SOC of the secondary battery.

Abstract: A sensor device includes a two-pin current interface including an input pin configured to draw an input current and an output pin configured to output an output current, a sensor configured to generate a measurement signal, and a current modulator configured to generate a current pulse as the output current such that the output current toggles between at least two main current states based on the measurement signal. The current modulator is configured to modulate the output current such that the output current is increased, to a first current level greater than the at least two main current states, at an initial phase of the current pulse for a first duration, and to modulate the output current such that the output current is decreased, to a second level less than the at least two main current states, at a terminal phase of the current pulse for a second duration.

Abstract: The present disclosure describes methods and systems for determining source rock potential in a subterranean region of a hydrocarbon reservoir. One method includes receiving, an electron spin resonance (ESR) image from an in-situ ESR scanner that is attached to a wellbore at a first subterranean location, wherein the wellbore extends into the subterranean region of the hydrocarbon reservoir; determining, a spin concentration level of a source rock in the first subterranean location based on the ESR image; and determining, the source rock potential at the first subterranean location based on the determined spin concentration level.

Abstract: Improved techniques for sensing and reporting power consumption from a single or multiple power supplies are disclosed. The disclosed techniques comprise integrated circuit solutions for sensing power. In some embodiments, an integrated circuit comprises circuitry for converting source voltage into a pulse-width modulation (PWM) signal and circuitry for modulating the PWM signal with a current sense signal to determine sensed power.

Abstract: The present application discloses methods and apparatus for measuring the arbitrary magnetic response of many individual magnetic particles at once, using a plurality of magnetic images of the magnetic particles acquired over a range of magnetic conditions.

Abstract: An integrated circuit testing system is provided that includes a conductive line connected to a node configured to have a ground voltage. A plurality of conductive structures are coupled to the conductive line. A plurality of test circuits each is configured to supply a test voltage individually to a different conductive structure of the plurality of conductive structures for testing electrical connectivity of each of the different conductive structures. The conductive line is positioned between the node and the test circuits of the plurality of test circuits. A controller is coupled to each of the test circuits of the plurality of test circuits. The controller is configured to cause each of the test circuits of the plurality of test circuits to individually supply the test voltage to each of the different conductive structures of the plurality of conductive structures.

Abstract: This disclosure relates to determining a spatial configuration of multiple nuclei. An electron dipole generates a spatially varying magnetic field such that each of the multiple nuclei is resonant at a respective resonance frequency defined by the magnetic field at a location of that nucleus. A first signal generator generates a first signal at a first signal frequency such that, as a result of dipole-dipole interaction between the electron dipole and a subset of the multiple nuclei that are resonant at the first signal frequency, a phase of the electron dipole is indicative of a number of nuclei that are resonant at the first signal frequency. A readout module determines the phase of the electron dipole, and determines the spatial configuration of the multiple nuclei based on the phase of the electron dipole. As a result of the high spatial resolution of the sensing the nuclear structure of molecules can be determined with low noise.

Abstract: A system for magnetic detection of an external magnetic field is described. The system includes a controller configured to control components of the system. The controller is configured to control an optical excitation source and a RF excitation source to apply pulse sequences to a magneto-optical defect center material such that in the excitation pulses of a first pair of RF excitation pulses have a first phase difference, the excitation pulses of a second pair of RF excitation pulses have a second phase difference, and the second phase difference is different from the first phase difference. The controller computes a combined magnetometry curve as a function of the RF excitation frequency based on a difference between a measured value of a first light detection signal and a measured value of a second light detection signal. The controller sets the first phase difference and the second phase difference based on the combined magnetometry curve.

Abstract: A method for identifying a defect opening profile includes: acquiring a vertical component of a magnetic flux leakage signal of a defect; identifying right-angle features and corresponding right-angle position points of the defect from the vertical component; obtaining all possible right-angle types at each right-angle position point of the defect according to the corresponding right-angle feature of the vertical component; traversing all the possible right-angle types at each right-angle position point to determine respective optimal right-angle type at each right-angle position point; and drawing the defect opening profile according to the respective optimal right-angle type at each right-angle position point.

Abstract: A magnetic field sensor includes: a first magnetoresistance effect element; a second magnetoresistance effect element; an output port; a signal line; and a first input terminal configured to be capable of applying a DC current or a DC voltage to the first magnetoresistance effect element. Each of the first magnetoresistance effect element and the second magnetoresistance effect element includes a first magnetic layer, a second magnetic layer, and a spacer layer disposed therebetween, the first magnetoresistance effect element and the second magnetoresistance effect element are connected through the signal line, and the output port is connected in parallel with the second magnetoresistance effect element.

Abstract: An electrode. The electrode includes a compressible form having an outer surface. A plurality of electrically conducting wire strands is disposed in a wire layer on the outer surface. The wire layer substantially covers the outer surface of the compressible form, and each wire strand comprises a first end and a second end configured to couple to a source of electromagnetic energy.

Abstract: A crack detection system and an apparatus equipped with a crack detection circuit, including a main body, and a detection control circuit and a detection coil disposed on the main body. The main body includes a top surface, a bottom surface, and a side surface coupled between the top surface and the bottom surface. The detection coil is distributed on an edge of the main body and disposed surrounding the side surface. Two ends of the detection coil are electrically coupled to the detection control circuit to form a closed-loop detection circuit. The detection circuit is configured to detect a crack in an edge region of the main body. The detection coil includes a plurality of detection sections sequentially coupled from head-to-tail, and adjacent detection sections are not collinear.

Abstract: The number of ports of a microcomputer is increased to detect an abnormality of the power supply line in a case where a power supply line to a load circuit is increased in number by two or more systems. A first resistor R1 and a second resistor R2 are commonly connected to one end of a third resistor R3. The other end of the third resistor R3 is connected to a monitor port of the microcomputer 15 and is grounded through a fourth resistor R4. The microcomputer 15 determines a value of a monitor voltage input to the monitor port to determine an abnormality of a first power supply line L1 and a second power supply line L2. Specifically, it is determined whether the first power supply line L1 and the second power supply line L2 are short-circuited to a ground side, or a voltage is not supplied to the first power supply line L1 and the second power supply line L2 due to an open circuit.

Abstract: A system includes a controller for automated test equipment (ATE) contactor to interface with a device under test (DUT) including a power converter having a primary and secondary side, each side has an input/output (I/O) pin. The controller causes the ATE contactor to apply a load current on the secondary side of the power converter at a first value and vary the load current to a second value. The contactor receives first and second indications, at the first and second load currents, of a voltage on the primary side I/O pin, a voltage on the primary side of the power converter, an input current on the primary side of the power converter, a voltage on the secondary side I/O pin, and a voltage on the secondary side of the power converter. The controller determines a primary and secondary side ATE contactor resistances based on the first and second indications.

Abstract: Provided are a method and a system for detecting bend in the rotating shaft of magnetic bearing. The system comprises a first displacement sensor, a second displacement sensor, and a processor electrically connected with the first displacement sensor and the second displacement sensor; the processor comprises a calculating unit, a first judging unit and a second judging unit; the calculating unit is configured to calculate center positions of the rotating shaft stopping at different positions during rotating a circle; the first judging unit judges whether the rotating shaft is bent or not according to a curve of the changed center positions, and outputs a test result of qualification if the rotating shaft is not bent. Users are able to determine whether the rotating shaft needs to be processed or not, to avoid causing destructive effects on the magnetic bearing system due to excessive bend degree of the rotating shaft.

Abstract: A strain gauge sensor includes a substrate, at least one resistor comprising a magnetoresistive material on the substrate. The magnetoresistive material exhibits a magnetostriction coefficient ? that is greater than or equal to () |2| parts per million (ppm) and an anisotropic magnetoresistance effect with an anisotropic magnetoresistance of greater than or equal to () 2% ? R/R. The strain gauge sensor consists of a single layer of the magnetoresistive material. At least a first contact to the resistor provides a sensor input and a second contact to the resistor provides a sensor output.