Abstract: A variety of application can use nuclear magnetic resonance as an investigative tool. Nuclear magnetic resonance measurements can be conducted using a nuclear magnetic resonance microscope. An example nuclear magnetic resonance microscope can comprise a film embedded in a coverslip, where the film is doped with reactive centers that undergo stable fluorescence when illuminated by electromagnetic radiation having a wavelength within a range of wavelengths and a magnetic field generator to provide a magnetic field for nuclear magnetic resonance measurement of analytes when disposed proximal to the film. Microwave striplines on the coverslip can be arranged to generate microwave fields to irradiate the analytes for the nuclear magnetic resonance measurement. Control of the microwave signals on the microwave striplines can be used for dynamic nuclear polarization in the nuclear magnetic resonance measurement of analytes.

Abstract: A method includes measuring a first property of a magnetic field using a bridge circuit with spatially separated bridge branches, and measuring a second property of the magnetic field using a magnetic field sensor located between the spatially separated bridge branches.

Abstract: System and method for a power converter. For example, the system includes a first controller; a first transmitter; a first receiver; one or more first wires; one or more second wires; a second controller; a second receiver connected to the first transmitter through the one or more first wires; and a second transmitter connected to the first receiver through the one or more second wires. The first controller is configured to output a first control signal to a first switch to affect a first current flowing through a primary winding of a power converter; and generate a first input signal. The first transmitter is configured to receive the first input signal and generate the first current. The second receiver includes a first coil configured to generate a first magnetic field based at least in part on the first current flowing through the first coil.

Abstract: Systems and embodiments for an integrated photonics tensor magnetometer are described herein. In certain embodiments, a system includes a plurality of magnetometers. The system also includes a laser carrier wafer coupled to each of the plurality of magnetometers that commonly distributes one or more lasers to each of the magnetometers in the plurality of magnetometers. Additionally, the system includes a plurality of photodetectors that detect light emitted from the laser carrier wafer and the plurality of magnetometers. Further, the system includes one or more processors that execute computer-executable instructions that cause the processor to monitor and control operation of the one or more lasers and calculate a magnetic field gradient based on the detected light from the magnetometers.

Abstract: A magnetic field generator includes a first planar substrate, a second planar substrate positioned opposite to the first planar substrate and separated from the first planar substrate by a gap, a first wiring set on the first planar substrate, a second wiring set on the second planar substrate, and one or more interconnects between the first planar substrate and the second planar substrate. The one or more interconnects electrically connect the first wiring set with the second wiring set to form a continuous electrical path. The continuous electrical path forms a conductive winding configured to generate, when supplied with a drive current, a first component of a compensation magnetic field configured to actively shield a magnetic field sensing region located in the gap from ambient background magnetic fields along a first axis that is substantially parallel to the first planar substrate and the second planar substrate.

Abstract: One example includes a magnetometer that includes a sensor cell comprising alkali metal vapor and a magnetic field generator system that generates predetermined AC magnetic fields through the sensor cell. The magnetometer also includes a laser system to provide optical pump and probe beams through the sensor cell in a pulsed manner to facilitate precession of the alkali metal vapor and to provide a detection beam corresponding to the optical probe beam exiting the sensor cell. The detection beam exhibits an optical property corresponding to a modified precession of the alkali metal vapor based on the predetermined AC magnetic fields and an external magnetic field. The magnetometer also includes a detection system to monitor the detection beam to detect the modified precession of the alkali metal vapor to calculate scalar and vector components of the external magnetic field based on the plurality of predetermined AC magnetic fields.

Abstract: A measurement circuit for monitoring at least one parameter of an input signal received from an external signal source includes at least one first measurement element coupled to the input signal and configured to provide an initial measurement signal indicative of a respective one or more of the at least one parameter of the input signal. At least one second measurement element is positioned proximate to the at least one first measurement element and configured to have a characteristic indicative of a stress condition associated with the at least one first measurement element. A compensation circuit is responsive to an output of the at least one second measurement element and to a reference signal to generate a compensation factor that is applied to the initial measurement signal to provide a corrected measurement signal.

Abstract: Time-multiplexed atomic magnetometry uses first and second atomic vapor cells located adjacent to a sample to be measured. Each vapor cell operates according to a sequence of alternating pumping and probing stages. However, the sequences are temporally offset from each other such that the second vapor cell is pumped while the first vapor cell is probed, and the first vapor cell is pumped while the second vapor cell is probed. With this time-multiplexed operation, the magnetic field generated by the sample can be measured without any time gaps. The Hilbert transform of the signals may be taken to obtain their instantaneous phases, which may then be interleaved to form a single gapless time sequence that represents the magnetic field of the sample over a time window that lasts for several continuous pumping/probing stages.

Abstract: An optically pumped magnetometer includes a vapor cell; at least one light source configured to produce a pump light beam and a probe light beam; a lens disposed between the at least one light source and the vapor cell; a quarter wave plate disposed between the lens and the vapor cell; a mirror configured to receive the pump light beam and probe light beam after passing through the vapor cell and reflect the pump light beam and probe light beam back through the vapor cell, the quarter wave plate, and the lens; and at least one detector configured to receive the probe light beam reflected by the mirror.

Abstract: A magic angle sample spinning nuclear magnetic resonance system including a housing, a cryogenic fluid in the housing, a magnet in the housing, a probe in the housing, a magic angle sample spinning insert in the probe, a sample battery in the magic angle sample spinning insert, a photovoltaic cell in the magic angle sample spinning insert wherein the photovoltaic cell is connected to the sample battery, an optic fiber operatively connected to the photovoltaic cell, and a laser operatively connected to the optic fiber wherein the laser provides power to charge the sample battery during the magic angle sample spinning nuclear magnetic resonance.

Abstract: A method for operating a magnetic field sensor and an associated magnetic field sensor system. The method includes: detecting an output signal of the magnetic field sensor that describes a magnetic field detected by the magnetic field sensor; establishing an adaptive filter function of an adaptive filter based on a model that describes an influence of specific objects on the output signal; filtering the output signal with the aid of the adaptive filter; ascertaining a deviation between the output signal and the output signal filtered with the aid of the adaptive filter; and detecting a presence of an object to be detected, based on the ascertained deviation.

Abstract: An apparatus for extracting a fluid from a formation includes an inflow control device (ICD) coupled to a production tubular disposed in a borehole penetrating the formation and configured to control flow into the production tubular and a nuclear magnetic resonance (NMR) front-end component assembly disposed in the borehole, the NMR front-end component assembly having a sensitive volume in a flow path leading to and/or coming through the ICD. The apparatus also includes a controller receiving input from an NMR electronics module coupled to the NMR front-end component assembly and providing output to the ICD based on the input from the NMR electronics module.

Abstract: The present disclosure provides a foldable portable metal detector including: a detection coil disk; a waterproof circuit protection compartment; a circuit component; a folding and fixing component; a fastening component; and an extension rod; the circuit component is inserted into the waterproof circuit protection compartment; the extension rod is fixedly connected to the waterproof circuit protection compartment; the circuit component is electrically coupled to the detection coil disk; the detection coil disk is provided with a bracket provided with a first through-hole and a second through-hole; the fastening component is provided with a bolt and a fixing column; the waterproof circuit protection compartment is provided with a connector provided with a connection hole; the bolt penetrates the connection hole and the first through-hole in sequence, the fixing column penetrates the second through-hole; and the waterproof circuit protection compartment is selectively rotated around the bolt.

Abstract: A magnetometer is provided which measures an ambient magnetic field having a frequency range of interest. An optical pumping source emits in the direction of a cell filled with an atomic gas a light beam linearly polarised in a polarisation direction. A parametric resonance excitation circuit induces in the cell a radiofrequency magnetic field having two components orthogonal to the polarisation direction and each oscillating at its own oscillation frequency. A parametric resonance detection circuit performs synchronous detection at an inter-harmonic of oscillation frequencies of an electrical signal outputted by a photodetector arranged to receive the light beam having passed through the cell. A zero-field servo-control circuit generates from the synchronous detection a compensation magnetic field opposite to a component of the ambient magnetic field oriented in the polarisation direction.

Abstract: A device for detecting isotopes includes an isotope portion including a material including an isotope of an element, a reaction control portion to cause a chemical reaction of the material, and an electrical parameter portion to measure a change in an electrical parameter of the material, where the change in the electrical parameter is caused by the chemical reaction, and where the change in the electrical parameter is dependent on the isotope in the material, to detect the isotope by comparing the change in the electrical parameter of the material with a known electrical parameter associated with a known isotope.

Abstract: A magnetostrictive sensor apparatus is provided, comprising at least one magnetic position marker, at least one sensing member with a waveguide to which the at least one magnetic position marker is contactlessly coupled, a detector coil device which is associated with the at least one sensing member, a data processing device which determines a time profile with a shape over time of signals of the detector coil device, wherein a recording of the time profile is provided, and an analysis device which analyzes the time profile.

Abstract: A measurement device includes a microwave generator, an electron spin resonance member, and an observation system. The microwave generator is configured to generate a microwave. The microwave is configured for an electron spin quantum operation based on a Rabi oscillation. The microwave generator has a coil configured to emit the microwave and an electrostatic capacitance member electrically connected in parallel to the coil. The microwave is irradiated to the electron spin resonance member. The observation system is configured to measure a physical quantity in a measured field in response to a state of the electron spin resonance member when the electron spin resonance member is irradiated by the microwave. The electrostatic capacitance member is directly connected to the coil or is arranged between the coil and an electric element that is electrically connected to the coil.

Abstract: Electrochemical devices with metal casings have been considered incompatible with nuclear magnetic resonance (NMR) spectroscopy because the oscillating magnetic fields (“rf fields”) responsible for excitation and detection of NMR active nuclei do not penetrate metals. According to the present invention, rf fields can still efficiently penetrate into nonmetallic layers of electrochemical cells (such as a coin cell battery configuration) provided the magnetic field is oriented tangentially to the electrochemical cell electrodes in a “skimming” orientation. As an example, noninvasive high field in situ 7Li and 19F NMR of an unmodified commercial off-the-shelf rechargeable coin cell was demonstrated using a traditional external NMR coil setup. The in operando NMR measurements revealed that irreversible physical changes accumulate at the anode during electrochemical cycling.

Abstract: A device, which may be embedded in a power distribution enclosure, enables analysis of the conditions of an electromechanical machine operating on a commonly supplied network with other electromechanical machines. The analysis preferably uses aggregate operating voltage and current signals supplied to or from such machines along with known changes in steady-state conditions of one or more machines to discern the discrete effect of one or more machines to the aggregate electrical signal. Such discrete effect can then be associated with the operating performance of the individual machine. And, since such voltage and current signals are normally readily available at the enclosure, wiring or any other communication means to any sensors on the electromechanical machines or devices are not necessary. The embedded device may optionally receive or transmit information to a computing or monitoring device remote from the enclosure.

Abstract: A vertical Hall effect sensor having three Hall effect regions interconnected in a ring can be operated in a spinning scheme. Each Hall effect region has three contacts: the first Hall effect region includes first, second, and third contacts; the second Hall effect region has fourth, fifth, and sixth contacts, and the third Hall effect region has seventh, eighth, and ninth contacts. Interconnections between the Hall effect regions are provided such that a first terminal is connected to a third contact, a second interconnection is arranged between the second and fourth contacts, a third terminal is connected to the sixth contact, a fourth interconnection is arranged between the fifth and seventh contacts, a fifth terminal is connected to the ninth contact, and a sixth interconnection is arranged between the first and eighth contacts.