Abstract: The present invention comprises a friction flow loop test method and apparatus that simulates well bore hydraulic conditions during fracturing utilizing large dual tanks with a primary feed tank and a secondary receiving tank wherein friction reducer hydration is controlled in an environment matching the well bore and is unaffected by recirculation mixing.
Abstract: A difference amplifier can be used for providing an amplified representation of a sensed current through a load device. A separate signal path can be used to provide fast fault detection, without requiring use of the difference amplifier. For example, a voltage scaling circuit can be used to scale a differential input signal indicative of the load current. The scaled representation can then be compared against a specified threshold corresponding to a fault current value. In this manner, a high-speed low-voltage comparator can be used to provide detection of a fault current that otherwise exceeds an input range of the difference amplifier, where the difference amplifier is used separately for precision current monitoring. As an illustrative example, such a scheme can provide fault detection even when an input of the difference amplifier is saturated.
Abstract: A reflectometer for allowing a test of a device. The reflectometer comprises a source of pulsed radiation, a first photoconductive element configured to output a pulse in response to irradiation from the pulsed source, a second photoconductive element configured to receive a pulse, a transmission line arrangement configured to direct the pulse from the first photoconductive element to the device under test and to direct the pulse reflected from the device under test to the second photoconductive element, and a termination resistance provided for the transmission line configured to match the impedance of the transmission line.
Abstract: The invention relates to a cable for electrically linking electronic assemblies, components or peripherals of a magnetic resonance apparatus by means of a symmetrical shielded cable which shields a plurality of conductors for a useful signal with respect to influences of an electromagnetic alternating field by means of at least one shielding device. In order to suppress sheath waves, a shielding device comprises at at least one point an interruption which is bridged by an active resistance or a reactance.
March 26, 2015
Date of Patent:
November 9, 2021
Max-Planck-Geselischaft zur Förderung der Wissenschaften e.V
Abstract: A bicycle speed sensor is provided on a bicycle. The bicycle includes a chain stay, a rear wheel, a brake disk and a positioning member. The rear wheel includes a hub and the brake disk includes a center hole disposed for the hub to pass through. The positioning member passes through the chain stay, the center hole and the hub so that the rear wheel and the brake disk are positioned on the chain stay. The bicycle speed sensor includes a signal transmitter and a signal sensor. The signal transmitter is configured to transmit a signal and disposed on the brake disk. The signal sensor receives the signal from the signal transmitter and is disposed on the chain stay. By fixedly positioning the signal transmitter and the signal sensor at the brake disk and a default position of and the chain stay respectively, displacements of sensor components is prevented to provide reliable sensing data.
July 27, 2018
Date of Patent:
November 2, 2021
Giant Electric Vehicle Kunshan Co., Ltd.
Abstract: A probe head comprises a plate-shaped support including respective pluralities of guide holes, a plurality of contact probes being slidingly housed in the respective pluralities of guide holes and including at least a first group of contact probes being apt to carry only one type of signal chosen between ground and power supply signals, a conductive portion realized on the support and including a plurality of the guide holes housing the contact probes of the first group, and at least one filtering capacitor having at least one capacitor plate being electrically connected to the conductive portion, the conductive portion electrically connecting the contact probes of the first group.
Abstract: The filter unit has a center frequency and comprises a first dielectric substrate, a first conducting plane, and at least one transmission arrangement. The at least one transmission arrangement comprises a shunt node which has a shunt connection to the conducting plane. The electrical length of the shunt connection defines the center frequency of the filter unit. The transmission arrangement further comprises a plurality of transmission lines connected in series between an input port and an output port, wherein each port is connectable to auxiliary systems with a system impedance. Moreover, each transmission line has a characteristic impedance and wherein the characteristic impedance of each transmission line is less than the system impedance.
Abstract: A current detection circuit to detect an electric current of the battery pack includes an insulating substrate, a first busbar and a second busbar disposed on a first surface of the insulating substrate, a shunt resistor disposed between the first busbar and the second busbar on the first surface, and electrically connected to the first busbar and the second busbar, and a hall effect sensor disposed on a second surface of the insulating substrate, wherein the second surface is opposite the first surface.
Abstract: A system reads a desired circuit parameter from a pixel circuit that includes a light emitting device, a drive device to provide a programmable drive current to the light emitting device, a programming input, and a storage device to store a programming signal. One embodiment of the extraction system turns off the drive device and supplies a predetermined voltage from an external source to the light emitting device, discharges the light emitting device until the light emitting device turns off, and then reads the voltage on the light emitting device while that device is turned off. The voltages on the light emitting devices in a plurality of pixel circuits may be read via the same external line, at different times. In-pixel, charge-based compensation schemes are also discussed, which can be used with the external parameter extraction implementations.
Abstract: A sensing array includes a plurality of pixels, one pixel of which includes: a sensor, the sensor including a first electrode, a second electrode, and an atomic defect site configured to be excited by light of a first frequency; a light source below the sensor and configured to emit light of the first frequency toward the defect site; and a radio frequency (RF) source below the sensor and configured to provide a first voltage to the first electrode, a second voltage to the second electrode, and an RF signal to the sensor, wherein the sensor is configured to sense a magnitude of a physical parameter by generating a photocurrent corresponding to a magnitude of a physical parameter and a differential between the first and second voltages, when excited by the light of the first frequency and affected by the RF signal.
April 30, 2019
Date of Patent:
October 19, 2021
HRL Laboratories, LLC
Edward H. Chen, Matthew J. Pelliccione, David T. Chang, Raviv Perahia, Biqin Huang
Abstract: The presented invention relates to a method for monitoring an insulation state of a first high-voltage network and an insulation state of at least one further high-voltage network of a vehicle, wherein a single insulation monitor is connected to the first high-voltage network and to the at least one further high-voltage network, and wherein, by means of the insulation monitor, a first insulation measurement, initially, is carried out, in a periodically repeated sequence, on the first high-voltage network, and, then, a further insulation measurement is carried out in each case on the at least one further high-voltage network.
Abstract: Power distribution network early failure detection method comprising: a waveform is decomposed into an approximation part and detail parts by wavelet transform, wherein the approximation part is referred to as an approximate shape primitive, and the detail parts are referred to as distortion primitives; the distortion primitives are divided into three primitives including harmonics, pulses and other distortions based on extreme points; characteristics of the primitives and time relationships between the primitives are extracted; probability distribution of the waveform is constructed according to the characteristics of the primitives and the time relationships between the primitives; and a judgment result of the waveform is obtained according to probability distribution of waveforms of different types.
Abstract: The present invention provides a strong magnetic force and high heat resistance for a magnetic-field forming magnet that applies a magnetic field to a test object to be inspected by an eddy current flaw detection device. A magnetic-field forming magnet for applying a magnetic field to a test object includes a first magnet and a second magnet. The first magnet has a strong magnet force and the second magnet having higher heat resistance than the first magnet is attached to a near end of the first magnet, the end near the test object.
Abstract: Magnetic-based electronic valve readers for determining a location and orientation of magnets coupled to implantable medical devices to determine a setting of the device (e.g., setting of a fluid flow control valve of the medical device). The electronic valve readers include an orientation sensing mechanism that is provided and configured to enable the electronic valve reader to: 1) allow for internal offset calculation of an orientation change of the electronic valve reader during a reading process; and/or 2) during the reading process, provide an indication or warning to the clinician that the orientation of the electronic valve reader has changed to an extent at or exceeding a predetermined angular acceptance threshold or window. Systems including the disclosed electronic valve readers and methods of reading a setting of the device are also disclosed.
Abstract: A vehicle steering wheel includes a hoop, a plurality of presence sensors and an outer sheath. Each of the presence sensors is arranged so as to detect a proximity and/or contact between a user's limb and the hoop. The outer sheath covers the plurality of presence sensors and is stitched with at least one seam that extends around at least part of the hoop. The plurality of presence sensors is mounted on the same support, and at least one of the presence sensors is arranged facing at least part of the seam of the outer sheath.
Abstract: An electromechanical relay is provided with a housing, a relay assembly within the housing, and a data collection cover enclosing the relay assembly within the housing. The data collection cover includes sensing members that extend in toward the relay assembly and engage disconnect switches of the relay assembly. The sensing members transmit analog signals to an analog-to-digital converter that converts analog signals to digital signals. The cover then stores, displays and/or communicates the digital information.
December 21, 2018
Date of Patent:
October 5, 2021
ABB Schweiz AG
Malbin Jose Mendoza, Prerak N. Shah, Todd Gentile, Richard Lindo
Abstract: A sparse voltage measurement-based fault location determination system and method for an alternating current (AC) distribution network is described. This method can use sparse voltage measurements and Bayesian compressive sensing (BCS) algorithm to reconstruct a sparse current vector. A fault location is then determined based on the reconstructed sparse current vector. The disclosed method provides robust fault location results under a variety of asymmetrical fault scenarios. Fewer intelligent electronic devices (IEDs) allocated in the terminal buses are needed for determining the fault location; therefore, this implementation is relatively cost effective.
Abstract: A method of sensing a rotation speed of an encoder includes generating measurement values by a plurality of sensor elements in response to sensing a magnetic field, where the plurality of sensor elements are grouped into a first shifted pair, a central pair, and a second shifted pair; generating a first shifted differential measurement signal based on the measurement values generated by the first shifted pair, a central differential measurement signal based on the measurement values generated by the central pair, and a second shifted differential measurement signal based on the measurement values generated by the second shifted pair; and generating an output signal based on detecting the first shifted differential measurement signal, the central differential measurement signal, and the second shifted differential measurement signal crossing at least one threshold.
Abstract: The present invention relates to a method and a measuring apparatus for testing a device under test. A measuring apparatus applies a first test signal to the device under test and measures at least one frequency response parameter of the device under test for a first plurality of frequency values lying in a first frequency range. The measuring apparatus applies a second test signal to the device under test and measures the at least one frequency response parameter of the device under test for a second plurality of frequency values lying in a second frequency range. The first frequency range at least partially overlaps with the second frequency range and the first plurality of frequency values at least partially differs from the second plurality of frequency values.
Abstract: It is an object of the present invention to provide an MgB2 wire helping to achieve compatibility between the ease with which superconducting connection is effected and thermal stability. A superconducting wire according to the present invention includes: an elemental wire formed of MgB2; and a first metal not reacting with Mg. In a section orthogonal to the longitudinal direction of the superconducting wire, the region extending from the center of the superconducting wire to the installation position of the elemental wire is formed by the elemental wire and the first metal.