Abstract: A vehicle ground fault detection apparatus (1) detects a ground fault of a high-voltage system electrically insulated from a vehicle body connected to a low-voltage system and includes a transformer (2) blocking a DC component between the low- and high-voltage systems, an oscillation circuit (3), in the low-voltage system, connected to a primary coil (21) of the transformer (2), and a voltage dividing resistor (4), in the high-voltage system, connected to a secondary coil (22) of the transformer (2). The vehicle ground fault detection apparatus (1) measures a positive peak of voltage generated in the voltage dividing resistor (4) by voltage induced in the secondary coil (22) through AC voltage generated by the oscillation circuit (3) and detects the ground fault using the peak voltage. The insulation of the coupling portion between the ground fault detection circuit and the high-voltage system circuit does not suffer breakdown during temporary AC noise.

Abstract: A method of characterizing frequency fluctuations of a resonator comprising the steps of: a) driving the resonator, in a linear regime, by simultaneously applying two periodical driving signals having respective frequencies, the frequencies being different from each other and from a resonant frequency of the resonator, but contained within a resonance linewidth thereof; b) performing simultaneous measurements of response signal of the resonator at the frequencies of the periodical driving signal; and c) computing a value representative of a correlation between the measurements, the value being indicative of frequency fluctuations of the resonator. An apparatus for implementing such a method is provided.

Abstract: A method for providing offset compensation in a Hall sensor comprising at least one Hall element having a plate-shaped sensor element made of a doped semiconductor material, comprises using measurements on the Hall element itself. The method comprises obtaining a first readout signal (VH) from the at least one Hall element which is substantially dependent on the magnetic field, obtaining a second readout signal (VP) from the at least one Hall element which is substantially independent of the magnetic field, and using the second readout signal (VP) for obtaining a prediction ({circumflex over (V)}O) of the offset (VO) on the first readout signal (VH).

Abstract: The invention relates to a method and a device for detecting fault currents in a regulated DC intermediate circuit having an active power factor correction.

Abstract: A system for magnetic detection includes a nitrogen vacancy (NV) diamond material, a radio frequency (RF) excitation source that provides RF excitation to the NV diamond material, an optical excitation source that provides optical excitation to the NV diamond material, an optical detector that receives an optical signal emitted by the NV diamond material, a magnetic field generator that generates a magnetic field applied to the NV diamond material, and a controller. The controller controls the RF excitation source to apply a first RF excitation having a first frequency and a second RF excitation having a second frequency. The first frequency is associated with a first slope point of a fluorescence intensity response of an NV center orientation of a first spin state, and the second frequency is associated with a second slope point of the fluorescence intensity response of the NV center orientation of the first spin state.

Abstract: A method and apparatus for fast magnetometer calibration with little space coverage is described herein. The present method and apparatus is capable of performing both 2-dimensional (2D) and 3-dimensional (3D) calibration for a magnetometer (magnetic sensor) and calculating calibration parameters. The present method and apparatus does not need the user to be involved in the calibration process and there are no required specific movements that the user should perform. The present method and apparatus performs magnetometer calibration in 2D or 3D depending on the natural device movements whatever the application that the magnetometer is used in.

Abstract: A NMR logging tool is provided and disposed in a wellbore at some desired depth. Packers are provided and actuated to hydraulically isolate a section of the wellbore and form a cavity between the NMR logging tool and the wall of the isolated section of the wellbore. The cavity is evacuated until a first desired pressure within the cavity is attained. Fluid is injected into the cavity until a second desired pressure within the cavity is attained. A plurality of NMR measurements is made on the region of the formation, each of the plurality of measurements being made at different times. Formation properties are inferred using the measurements. A baseline NMR measurement may be made when a first desired pressure is attained. A time-zero NMR measurement may be made when a second desired pressure is attained. Similar measurements may be made in a laboratory on a sample.

Abstract: A sensor for measuring conductivity of a fluid containing dissolved ions, particularly for measuring conductivity of salt water, features a cylindrical tube (57) of poorly conductive material such as glass, a first electrode (51A) and a second electrode (51B) inside the tube, connected together (56) to maintain a common electrical potential, a first transformer (52,53) concentrically arranged around the tube (57) to drive current through the fluid in the tube, and a second transformer (54, 55) arranged to sense a value of the current flowing in the fluid, and a digital processing circuit (62) coupled to receive an output signal of the second transformer, and to derive therefrom a value representing the conductivity of the fluid. The sensor is adapted to be towed behind a research ship, or to be deployed on an autonomous underwater vehicle (AUV) or the like. Current signals are preferably processed by digital switching measurement technology (dMST).

Abstract: The present disclosure relates to an insulation resistance measuring device and method, including a parameter resistance connected to a negative electrode terminal of a battery; a shunt resistance connectable to the parameter resistance; a current detection circuit including an operational amplifier configured to detect and output voltage between both ends of the shunt resistance; and a control unit configured to determine the insulation resistance of the battery using a switch control terminal configured to control a switch connected between the parameter resistance and the shunt resistance to an ON or OFF state, a detection signal output terminal configured to selectively apply a first high voltage signal and a first low voltage signal to the shunt resistance, a control signal output terminal configured to apply a control voltage signal to the operational amplifier to adjust an output voltage of the operational amplifier within a predetermined range, an ADC connected to an output terminal of the operational

Abstract: A medical apparatus (300, 400, 500) includes a magnetic resonance imaging system (306); magnetic compensation coils (334, 335) for compensating for magnetic inhomogeneities within the imaging zone; a gantry (308) operable for rotating about the imaging zone; a position sensor (312) for measuring the angular position and the angular velocity of the gantry; at least one magnetic field distorting component (310, 510, 512) in the gantry; and a memory (362) storing machine executable instructions (380, 382, 410, 530, 532) and field correction data (372).

Abstract: The invention relates to a sensor (300) for determining a dielectric property of a medium (205). The sensor (300) has a substrate (301, 302), which has at least one via (203, 204), and a waveguide (12), which is arranged so as to be planar in relation to an upper surface of the substrate (301). The waveguide (12) can be connected to an analysis device (20) by means of the at least one via (203, 204). Furthermore, the waveguide (12) is designed to receive an input signal from the analysis device (20) and to output an output signal to the analysis device (20). When of the waveguide (12) is in contact with a medium (205), properties of the input signal and of the output signal are indicative of the dielectric property of the medium (205). The arrangement of the waveguide (12) so as to be planar in relation to the substrate (301) enables larger measurement ranges and improved measurement accuracies. Furthermore, a compact construction is achieved by the planar structure.

Abstract: A method for determining a magnetic field of a magnet along a surface of the magnet, the method comprising: performing a relative movement between the surface of the magnet and a magnetic camera device; measuring the magnetic field by means of the magnetic camera device, to thereby obtain magnetic field measurements for the surface; wherein the relative movement is a continuous movement which is a combination of a relative translational movement and a relative rotational movement; and apparatus.

Abstract: The present invention relates to a control device for controlling at least one function of a motor vehicle unit. Said control device includes a capacitive sensing surface (2) configured so as to detect a manual command from a user. Said control device is characterized in that it also comprises a device for detecting objects having ferromagnetic properties, said detection device including:—at least one magnetic field generation device (3) configured so as to generate a magnetic field on the capacitive sensing surface (2);—at least one device (4) for measuring the magnetic field generated by the magnetic field generation device (3); and—a device for monitoring the control (5), that is connected to the measurement device (4) and to the capacitive sensing surface (2), and is configured so as to monitor the control signal emitted by the capacitive sensing surface (2) on the basis of the magnetic field measured by the measurement device (4) during detection of the command.

Abstract: A solar photovoltaic system inspection apparatus sequentially applies AC inspection signals to a positive electrode and a negative electrode of a solar cell string, and is provided with: an impedance calculation unit configured to measure an indicator value when the signal is applied to the positive electrode, and an indicator value when the signal is applied to the negative electrode, the indicator values varying depending on the number of solar cell modules from the terminal to which the inspection signal was applied to a failure position; and a control unit configured to obtain the failure position based on the ratio of the indicator value measured when the inspection signal was applied to the positive electrode, to the indicator value measured when the inspection signal was applied to the negative electrode.

Abstract: A detection system includes a first electrode provided at a seat of a vehicle; a second electrode provided at an operation unit which is operated by being contacted, the second electrode being connected to a reference potential portion; and a detection device that measures combined capacitance between the reference potential portion and the first electrode and detects a presence of a person on the seat, and a contact between the person and the operation unit based on a measurement value of the combined capacitance.

Abstract: A magnetic rotation detection apparatus which is capable of suppressing occurrence of assembly failure of components. A gear position sensor 10 is provided with a sensor unit 12 including a Hall element 20, a magnet shaft 11 including a magnet 17, a case 14 housing the sensor unit 12 and the magnet shaft 11, and an inner O-ring 24 sealing a gap between the sensor unit 12 and the case 14. The case 14 includes a metal bearing 19 to support the magnet shaft 11, and the magnet shaft 11 includes a molded portion 18 to fix the magnet 17. A thrust plate 22 is arranged between the molded portion 18 and a base plate 21 (circuit board) of the sensor unit 12, and a spring mechanism 26 is arranged to bias the molded portion 18 to the thrust plate 22. A minute gap is present between the metal bearing 19 and the magnet shaft 11.

Abstract: An angle sensor is provided for determining an absolute angle signal of a first part rotated with respect to a second part. The angle sensor comprises a first grating ring for generating a first signal representative of a relative position of a first sensor along a corresponding ring segment of the first grating ring. The angle sensor further comprises a second grating ring for generating a second signal representative of a relative position of a second sensor along the corresponding ring segment of the second grating ring. The first plurality and the second plurality are co-prime numbers and a difference between the first plurality and the second plurality being larger than 1. The angle sensor also comprises a calculator configured for calculating the absolute angle signal using a first linear combination of the first signal and the second signal.

Abstract: A dielectric resonator is excited at its natural resonant frequency to produce a highly uniform electric field for the generation of plasma. The plasma may be used as a desolvator, atomizer excitation source and ionization source in an optical spectrometer or a mass spectrometer.

Abstract: A probe card includes a substrate module having an installation hole and a first stair-shaped structure provided on two stairs thereof with a first connection surface and a first transmission surface having a first contact pad, a probe module having a probe and a second stair-shaped structure provided on two stairs thereof with a second connection surface and a second transmission surface having a second contact pad electrically connected with the probe, and a pressing member. The probe module is disposed in the installation hole so that the first and second connection surfaces are connected and the first and second transmission surfaces are opposite. The pressing member is detachably pressed on the probe module to press the second connection surface against the first connection surface and make the first and second contact pads electrically connected.

Abstract: In certain embodiments, a method includes applying voltage to a sensor that includes first and second electrode tracks, the sensor proximate to a conductor depressible relative to the sensor and located between a button and the sensor. The conductor can capacitively couple with a capacitive node formed by the tracks, and the button can capacitively couple with an object. A value of a capacitance at the node is measured, the capacitance reflecting an amount of capacitive coupling between the conductor and the node. In response to the value meeting a first condition, a first button state is detected, indicating the object is within a detectable distance of and not in contact with the button. In response to the value meeting a second condition, a second button state is detected, indicating the object is in contact with the button and the conductor is not in contact with the sensor.