101results about "Analysis using optical pumping" patented technology

A method for performing wide-field microscopy (WFM) using nitrogen vacancy (NV) centers in diamond. A diamond micro chip (DMC) having a (111)-oriented NV ensemble is temporarily adhered to a polymer microstructure on a portion of a transparent substrate, positioned above a placement location on a sample, and the transparent substrate tilted until the DMC detaches from the polymer microstructure and lands in the vicinity of the placement location, and then optionally its position is fined tuned. An image of the sample is then procured using NV WFM through the DMC.

The invention relates to a method for calibrating a quantum sensor, in particular a magnetic field sensor (1), which has a crystal (2) with color centers (2a), in particular a diamond crystal with NV centers. During calibration, the quantum sensor is operated in a calibration mode which comprises the following steps: a) automatically setting a plurality of values of at least one operating parameter (PA, PM, MD, fMW, …) which influences the sensitivity (ηB) of the quantum sensor, b) automatically determining a measure of the sensitivity (ηB) of the quantum sensor for the plurality of values of the at least one operating parameter (PA, PM, MD, fMW, …), and c) automatically selecting a value (PA,OPT, PM,OPT, …) of the at least one operating parameter (PA, PM, …) that is optimal for the sensitivity (ηB) of the quantum sensor. The invention also relates to a quantum sensor, in particular a magnetic field sensor (1), which has a calibration device (12) designed to carry out the method.

Systems and methods of quantum sensing include depositing a sample volume onto an ensemble of quantum defects, hyperpolarizing spins in the sample volume, performing a sensing sequence, and reading out information regarding electronic spin states of the quantum defects in the ensemble of quantum defects, which sense the hyperpolarized spins in the sample volume.

To enhance the sensitivity of magnetic field intensity.SOLUTION: A photoexcitation magnetic sensor 1 comprises: a cell 2 filled with alkali metal vapor; a pump laser 4 and a first optical system 6 for making pump light incident on sensitivity regions ARa-ARd in the cell 2 along a y-axis direction; a probe laser 5 and a second optical system 7 for making probe light incident on the sensitivity regions ARa-ARd along an x-axis direction; a bias magnetic field coil 11 for applying a bias magnetic field By along the y-axis direction to the cell 2, and determining the resonant frequency of an electron spin; bias magnetic field gradient correction coils 12 and 13 for correcting the gradient of the bias magnetic field By; a tilting coil 14 for tilting the rotation axis direction of the electron spin; optical sensor pairs 43a-43d for detecting the probe light passed through the sensitivity regions ARa-ARd; and a reading circuit 10 for measuring magnetic field intensity on the basis of the output of the optical sensor pairs 43a-43d.SELECTED DRAWING: Figure 1

An optically pumped magnetometer includes a cell, a pump light incidence unit causing pump light to be incident on a sensitivity region inside the cell in a first direction, a probe light incidence unit causing probe light for detecting change in electron spins to be incident on the sensitivity region in a direction intersecting the first direction, a bias magnetic field coil applying a bias magnetic field in the first direction to the inside of the cell and determining a resonance frequency of the electron spins, a gradient correction coil correcting a gradient of the bias magnetic field, an electron spin tilting unit tilting a rotation axis direction of the electron spins, an optical sensor detecting the probe light having passed through the sensitivity region, and a magnetic field measuring unit measuring a magnetic field strength related to the sensitivity region based on an output of the optical sensor.

A magnetometer is described. The magnetometer comprises a plurality of vacancy centres embedded in a body of material, a magnet arranged to apply a bias magnetic field to the plurality of vacancy centres along a first axis, a microwave source arranged to apply a microwave field to the plurality of vacancy centres, a probe laser source arranged to apply a probe laser to the plurality of vacancy centres along or parallel to the first axis, wherein the probe laser is polarised along a second axis orthogonal to the first axis, an excitation laser source arranged to apply an excitation laser to the plurality of vacancy centres along a third axis orthogonal to the first axis, and detection apparatus for measuring a change in a plane of polarisation of the probe laser.

A sensor apparatus for determining and / or monitoring a process variable of a medium in a containment includes: a crystal body including at least one defect; a magnetic field system for producing a magnetic field in the region of the crystal body and in the region of the medium within the containment, wherein the crystal body and the magnetic field system are arrangeable from the outside at a wall of the containment; a detection unit for detecting a magnetic field-dependent, fluorescent signal from the crystal body, wherein the detection unit has an excitation unit for optical exciting of the defect and a detector for detecting the fluorescent signal; and an evaluation unit for ascertaining at least one piece of information concerning the process variable based on the fluorescent signal.

The disclosure concerns non-invasive measurement of a local AC magnetic field and / or a local temperature in an electrically conductive sample structure. The system includes a sensing probe of a solid-state lattice with one or more spin defects which are tunable by external magnetic and / or electric fields, an RF transmitting antenna configured to emit RF waves, and a microscope configured to determine and / or control the distance between a sensing surface of the sensing probe and a surface of the electrically conductive sample. The RF transmitting antenna is arranged at a distance from the surface of the conductive sample structure for contactless induction of electrical RF current flow in the electrically conductive sample structure. The RF transmitting antenna is further arranged at a distance from the spin defects such that near-field inductive coupling between the RF transmitting antenna and the spin defects are prevented or substantially prevented.

The invention relates to a method for generating a useful signal (11) from a signal (5') emitted from a spin-based quantum system (4), said method including exciting the spin-based quantum system (4) by means of an excitation light (13), exciting the spin-based quantum system (4) by means of an electromagnetic field (3) which jumps back and forth between two measurement frequencies at a modulation frequency, the two measurement frequencies having a first measurement frequency distance from an expected resonant frequency, detecting the signal (5') emitted from the spin-based quantum system (4) in order to obtain a measurement signal (7), multiplying the measurement signal (7) by a modulation signal (9) which jumps back and forth between two modulation signal states at the modulation frequency in order to generate a modulated measurement signal (7'), demodulating the modulated measurement signal (7') in order to generate the useful signal (11), determining a comparison signal, and determining whether the expected resonant frequency value is correct based on the comparison signal.

A system and method for spatially resolved measurement of the magnetic flux density of a magnetic stray field at the surface of a test specimen, preferably using an optical pumped magnetometer (OPM) or a SQUID. The underlying idea is to spatially resolve a mechanical property of the test specimen based on the magnetic stray field at its surface. The magnetic stray field at the surface then provides a measure of the mechanical stress concentration in the test specimen.

The invention provides an optical excitation magnetic sensor and a brain magnetic instrument. The optical excitation magnetic sensor includes: a unit; a pump light incidence section that causes pump light to enter a plurality of sensitivity regions inside the cell in a first direction; a probe light incidence unit that causes probe light to enter the plurality of sensitivity regions in a direction intersecting the first direction; a bias magnetic field coil that applies a bias magnetic field to the inside of the cell to determine the resonance frequency of the electron spin; an electron spin tilting unit that tilts the rotation axis direction of electron spin; a light sensor for detecting the probe light that has passed through the sensitivity region; and a magnetic field measurement unit that measures the magnetic field intensity of the sensitivity regions, and the bias magnetic field coil applies a plurality of bias magnetic fields having mutually different intensities to each of the plurality of sensitivity regions.

A magnetic property measurement device for a soft magnetic material includes a measurement sample magnetic field application mechanism, a diamond NVC sensor, a laser light irradiation mechanism, a microwave irradiation mechanism, an optically detected magnetic resonance spectrum measurement mechanism, and a control and data analysis mechanism, the control and data analysis mechanism is configured to execute a measurement condition input step, a magnetic property measurement step, and a data analysis step, the measurement condition includes a range of an external magnetic field H0, a magnetic permeability μsmp of a measurement sample, and a predetermined frequency sweep width Δω in a microwave, and the predetermined frequency range of the microwave in the magnetic property measurement step is a region of “ωd±Δω” based on a microwave frequency ωd of the dip obtained from a relational expression of “ωd=2.87±28×μsmp×H0”.

The invention relates to a magnetic sensor (1) having a microwave source (6) and a sensor plate (2), the sensor plate (2) having a sensor crystal (5) with at least one magneto-optical defect, an excitation light source (3), a detector (7) and at least two permanent magnets (8). The sensor crystal (5) is arranged in such a way that the microwave radiation generated by the microwave source (6) can be absorbed by the at least one magneto-optical defect of the sensor crystal (5). The excitation light source (3) is arranged to emit an excitation light beam (4) and is configured and arranged in such a way that the excitation light beam (4) emitted by the excitation light source (3) can induce emission of fluorescent radiation in the at least one magneto-optical defect of the sensor crystal (5). The detector (7) is designed and arranged in such a way that it detects the emitted fluorescent radiation. The at least two permanent magnets (8) are arranged and arranged in such a way that they generate a uniform, static magnetic field in the sensor crystal (5).

Discloses is a magnetometer and a method of carrying out magnetometry. A sensor element comprising a sheet of a 2D layered material having a photon-emitting spin-active defect is provided. The defect has a spin triplet state with first, second and third non-degenerate spin sublevels in the absence of applied magnetic field. An optically detected magnetic resonance measurement is conducted on the sensor element by subjecting the sensor element to optical excitation and photoluminescence detection whilst a variable frequency microwave signal is applied, the microwave signal causing transitions between the spin triplet state spin sublevels. The photoluminescence detection comprises: detecting a change in photoluminescence signal when the microwave signal is resonant with a transition between the spin triplet state spin sublevels; and determining a characteristic of a magnetic field based on the detected photoluminescence signals.

A high-frequency magnetic field generator 2 applies microwave to a magnetic resonance member 1 capable of an electron spin quantum operation using the microwave. A magnet 3 applies a static magnetic field to the magnetic resonance member 1. An irradiating device 12 irradiates the magnetic resonance member 1 with light of a specific wavelength. A flux transformer 4 senses a measurement target magnetic field using a primary coil 4a and applies an application magnetic field corresponding to the sensed measurement target magnetic field to the magnetic resonance member 1 using a secondary coil 4b. Further, the magnetic resonance member 1 is arranged at a position in a hollow part of the secondary coil 4b of the flux transformer 4 and in a hollow part of the magnet 3.

The invention concerns a system and a method for non-invasive measurement of a local AC magnetic field and / or a local temperature in an electrically conductive sample structure (300). The system comprises a sensing probe (1) formed of a solid-state lattice with one or more spin defects which are tunable by external magnetic and / or electric fields, an RF transmitting antenna (2) configured to emit RF waves, and a microscope configured to determine and / or control the distance between a sensing surface (15) of the sensing probe and a surface of the electrically conductive sample (300). The RF transmitting antenna (2) is arranged at a distance (DRFT) from the surface of the conductive sample structure (300) for contactless induction of electrical RF current flow in the electrically conductive sample structure (300). The RF transmitting antenna (2) is further arranged at a distance (DRFT) from the one or more spin defects such that near-field inductive coupling between the RF transmitting antenna (2) and the one or more spin defects is prevented or substantially prevented.

An optically pumped magnetometer includes a cell, a pump light incidence unit causing pump light to be incident on a plurality of sensitivity regions inside the cell in a first direction, a probe light incidence unit causing probe light to be incident on the sensitivity regions in a direction intersecting the first direction, bias magnetic field coils applying a bias magnetic field to the inside of the cell and determining a resonance frequency of the electron spins, an electron spin tilting unit tilting a rotation axis direction of the electron spins in a direction perpendicular to the first direction, an optical sensor detecting the probe light; and a magnetic field measuring unit measuring magnetic field strengths related to the sensitivity regions, wherein the bias magnetic field coils respectively apply a plurality of the bias magnetic fields having strengths different from each other to the plurality of corresponding sensitivity regions.

The invention relates to an apparatus for measuring intracorporeally generated magnetic fields, comprising: a catheter, wherein an optical waveguide device is arranged within the catheter, a sensor unit for measuring magnetic fields, wherein the sensor unit is a nitrogen-vacancy centre magnetometer which has, as a sensor medium, one or more diamond crystals having a plurality of nitrogen-vacancy centres, wherein the one or more diamond crystals are arranged within the optical waveguide device, wherein the sensor unit comprises a magnetic field generating device for generating a magnetic field in the region of the sensor medium, wherein the sensor unit has an excitation light source for radiating excitation light into the optical waveguide device in order to excite the sensor medium, wherein the sensor unit comprises a microwave source for generating microwaves in order to excite the sensor medium with microwaves, and wherein the sensor unit comprises a photodetector for detecting resonance-dependent fluorescent light from the sensor medium, and an evaluation unit which is configured to determine, based on the detected fluorescent light, a magnetic field at the respective location of the one or more diamond crystals. The invention relates to a method for measuring intercorporeally generated magnetic fields, a computer program and a machine-readable storage medium.

The invention relates to a magnetometer (1) for detecting a magnetic field, comprising an excitation light source (2) which is designed to emit an excitation beam (3), a sensor crystal (4) which has at least one magneto-optical defect, and a device (8) for generating a microwave field. The sensor crystal (4), the device (9) for generating the microwave field, and the excitation light source (2) are designed and arranged relative to one another such that the excitation light beam (3) emitted by the excitation light source (2) produces an emission of fluorescence radiation in the at least one magneto-optical defect of the sensor crystal (4), and the microwave field can be detected in the sensor crystal (4). The magnetometer (1) additionally has a detector (5), which is designed and arranged such that the detector detects the emitted fluorescence radiation, and at least two permanent magnets (6), which are arranged and designed so as to generate an at least approximately homogenous static magnetic field in the sensor crystal (4). The sensor crystal (4) and the at least two permanent magnets (6) are arranged on a common positioning element (7).

The invention relates to a sensor unit (1) having an optical system (2), an excitation light source (3), a first signal detector (4) and a reference detector (4), the optical system (2) having a lattice (6) with at least one defect, and the excitation light source (3) being configured to emit excitation radiation (7). The optical system (2) and the excitation light source (3) are arranged and cooperate with each other in such a way that a first portion of the excitation radiation causes emission of fluorescent radiation (8) in the lattice (6) and a second portion (10) of the excitation radiation is transmitted or reflected by the optical system (2). The first signal detector (5) is configured to at least partially detect the fluorescent radiation (8), and the reference detector (4) is arranged and configured such that the reference detector can at least partially detect a second portion (10) of the excitation radiation transmitted or reflected by the optical system (2). The invention also relates to a method for operating such a sensor unit (1).

A magnetic field gradiometer for determining a magnetic field gradient includes at least one excitation light source for emitting excitation light, and two spatially spaced-apart measuring areas for magnetic field measurement. Color centers in diamond are arranged in the two measuring areas. The color centers emit fluorescent light upon excitation using the excitation light. The magnetic field gradiometer further includes at least one microwave emitter for applying at least one microwave field to the spatially spaced-apart measuring areas, two detectors for detecting the fluorescent light from the two spatially spaced-apart measuring areas, and an evaluator for determining the magnetic field gradient based on the fluorescent light detected by the two detectors. The two measuring areas are configured as freestanding measuring waveguides of a common diamond crystal. The diamond crystal is used as a substrate for the measuring waveguides.

Provided is a spin sensor comprising a single diamond particle, wherein: the maximum diameter of the diamond particle is 0.01 μm or more and less than 10 μm; the diamond particle has a color center; the electronic state of the color center has a spin ground level of spin zero and a spin excitation level of spin ± 1; and the spin transverse relaxation time T2 of the diamond particle is 180 nsec or more.

In order to provide a sensor device for magnetic field measurement by means of optical magnetic resonance measurement which, in comparison with known devices, has a reduced size and reduced manufacturing costs, a sensor device (100) for magnetic field measurement by means of optical magnetic resonance measurement (ODMR), comprising: - a diamond (10) having a plurality of color centers, more particular nitrogen defects, - a laser emitter (13), - a first photodetector (18), and - a circuit board (11), is proposed, wherein the laser emitter (13) is designed for the fluorescence excitation of the color centers in the diamond (10), and the first photodetector (18) is designed to receive fluorescence radiation of the color centers of the diamond (10), and wherein furthermore: - the circuit board (11) has a plurality of layers (15, 15a, 15b, 15c, 15d) comprising at least one inner layer (15a); - the laser emitter (13) is disposed on an upper face (12) of the circuit board (11); - the first photodetector (18) is disposed on a lower face (17) of the circuit board (11); - the diamond (10) is disposed in the interior of the circuit board (11) in the plane of extension (16) of the at least one inner layer (15a); and - at least one of the layers (15c) has current-carrying structures (31) which are designed to produce a homogeneous magnetic field which is oriented perpendicularly to the layers (15, 15a, 15b, 15c, 15d) of the circuit board (11) and which permeates the diamond (10).

The present invention relates to a system for spatially resolved detection of a measure of the magnetic flux density of a magnetic stray field at the surface of a test object. The system according to the invention comprises a radiation source, a magnetic field-sensitive medium, a magnetic shield with a shielded volume, an illumination optic, a reflective element, a digital image sensor, an imaging optic, and a control and evaluation unit.

To suppress a noise component resulting from irradiation light, so that measurement accuracy is improved.SOLUTION: A light-receiving device 13 receives fluorescence emitted from a magnetic resonance member 1 by corresponding to excitation light and generates a fluorescence sensor signal corresponding to a fluorescence intensity. A CMR arithmetic unit 25 takes into account non-linearity of a fluorescence sensor signal level relative to an amount of excitation light, and applies common mode rejection based on a reference light sensor signal of reference light having branched excitation light, to the fluorescence sensor signal, in order to generate a CMR signal. An A / D converter 26 digitizes the CMR signal, whereas an analog digital converter 27 digitizes the reference light sensor signal. An arithmetic processing device 31 derives a measurement value of a measured place on the basis of the digitized CMR signal and the digitized reference light sensor signal.SELECTED DRAWING: Figure 1

An atomic magnetometer system is disclosed that includes a variable magnetic field source (14) configured to provide an oscillating primary magnetic field to generate a secondary magnetic field in a sample (16). The atomic magnetometer system also includes an atomic magnetometer for detecting the secondary magnetic field. The atomic magnetometer includes an atomic sample, a pump and probe subsystem configured to pump the atomic sample to create polarized light and probe atomic coherence precession within the atomic sample with a probe beam, and a detector configured to detect the probe beam and generate a detection signal. The system is configured to drive the variable magnetic field source (14) in response to the detection signal at a frequency tuned to the rf resonance. A method of operating the atomic magnetometer is also disclosed.

The invention provides an optical excitation magnetic sensor and a brain magnetic instrument. The optical excitation magnetic sensor includes: a unit; a pump light incidence section that causes pump light to enter a sensitivity region inside the cell in a first direction; a probe light incidence unit for causing probe light for detecting a change in electron spin to enter the sensitivity region in a direction intersecting the first direction; a bias magnetic field coil that applies a bias magnetic field along the first direction to the inside of the cell to determine the resonance frequency of the electron spin; a gradient correction coil that corrects the gradient of the bias magnetic field; an electron spin tilting unit that tilts the rotation axis direction of electron spin; a light sensor that detects the probe light that has passed through the sensitivity region; and a magnetic field measurement unit that measures the magnetic field strength of the sensitivity region on the basis of the output of the optical sensor.

Technology provides for a magnetic field sensor cell including a color center arranged in a substrate, where the color center includes single-defect photon emitters, and a plurality of sector-shaped slices provided on the substrate, where each sector-shaped slice includes a body having a transparent material having a first refractive index formed into a raised sector shape having a narrow end formed into a grating structure, and a photoluminescent quantum dot placed in the body of the sector-shaped slice, where the sector-shaped slice is configured such that light from the quantum dot is reflected toward and emitted out of the narrow end, where the plurality of sector-shaped slices are arranged around the color center such that the narrow end of each slice of the plurality of slices points toward the color center. An array of magnetic field sensor cells can be arranged on the substrate.