43results about "Analysis using optical pumping" patented technology

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 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 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.

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.

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.

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.

A nuclear magnetic resonance (NMR) spectrometer includes an array of distinct, separate samples to be tested, a set of optically pumped magnetometers (OPM), an inhomogeneous magnet having a bore configured to accept the array of samples, a zero-to- ultra-low field detection center, a field cycler stage to transport the array of samples between the inhomogeneous magnet and the detection center along a path, the path having a guiding field solenoid; and a computer to control operation of the spectrometer.

The invention discloses an in-situ electric transport and quantum magnetics collaborative characterization system, and relates to the technical field of material physical property measurement under extreme conditions, the system comprises a multi-physics field coupling module, the multi-physics field coupling module comprises an extreme pressure device, a vector superconducting magnet and a low-temperature constant-temperature device, the extreme pressure device comprises a diamond anvil cell, and the vector superconducting magnet comprises a quantum magnetic field; comprising a nitrogen vacancy color center, an electrical probe and a microstrip transmission line, the cooperative detection module comprises a magnetic detection terminal and an electrical detection terminal and is used for detecting a magnetic signal of the sample to be detected and performing in-situ measurement so as to characterize the electrical transport property; and the position adjustment and vibration isolation module comprises a vibration isolation platform, and the extreme pressure device and the magnetic detection terminal are jointly rigidly fixed on the vibration isolation platform so as to ensure the alignment stability of the micron-sized optical path. According to the invention, the submicron-level optical alignment stability can be realized while accurate loading in a low-temperature, high-intensity magnetic field and high-pressure environment can be ensured, so that the isotactic in-situ electric-magnetic collaborative data with a high signal-to-noise ratio can be obtained.

Vehicle seat (1) for a vehicle, - with a backrest (3) arranged on a seat element (2), which has a back side (5) facing a user (4) of the vehicle seat (1) for supporting the back of the user (4) and a seat cover (6) on the back side (5), - with a sensor arrangement (7) for detecting magnetic fields of a human heart, comprising at least one fiber magnetometer (8, 9) having an optical fiber (10) and a sensor element (12) arranged at a free fiber end of the optical fiber (10) for detecting magnetic fields of the user's (4) heart, characterized in that - that at least one fiber magnetometer (8, 9) is arranged at least sectionally on the seat cover (6) of the backrest (3).

System for positioning and maintaining the position of a reference sensor around a magnetoencephalography helmet. The invention relates to a system for positioning and maintaining the position of a reference sensor (8) on a magnetoencephalography (MEG) helmet (7), comprising: - an arch (1) comprising: at least one fixing branch (10) for fixing the arch to an MEG helmet, a support plate (11) on which the branch is fixed, - a sensor support post (2) fixed to the support plate of the arch; - a locking component (6) for fixing the reference sensor to the post in at least one position defining the position with respect to an MEG helmet.

A small volume optoelectronic chip containing an LED chip having embedded therein a diamond with nitrogen-vacancy centers, wherein the LED chip generates light having a first wavelength, and the diamond with nitrogen-vacancy centers generates light having a second wavelength after excitement with light having the first wavelength.

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, the excitation light source (2) is arranged in the sensor crystal (4) in such a way that an excitation light beam (3) emitted by the excitation light source (2) causes emission of fluorescent radiation in at least one magneto-optical defect of the sensor crystal (4) and the microwave field can be detected in the sensor crystal (4), and furthermore, the magnetometer (1) has a detector (5) which is designed and arranged such that the detector (5) emits fluorescent radiation in the sensor crystal (4) and at least two permanent magnets (6), the sensor crystal (4) has a detector and a permanent magnet, which are arranged and designed such that the detector detects the emitted fluorescent radiation, in such a way that the permanent magnet generates an at least approximately uniform 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).

A system for localizing a magnetic-field source, the system comprising: an optical fiber (20) containing nanodiamonds (24) having nitrogen-vacancy centers; a light source (10) optically coupled to the optical fiber (20) and configured to generate and introduce laser-excitation pulses into the optical fiber; a photodetector (13) optically coupled to the optical fiber (20) and configured to record fluorescence emitted by the nanodiamonds (24) in response to the laser-excitation pulse as a function of time, and to detect a transient dip in the recorded fluorescence intensity; a timing module (14) connected to the photodetector (13) and configured to measure a time interval between the generation of the laser-excitation pulse and the detection of the transient dip; a trigger generator (11) connected to both the light source (10) and the timing module (14) and configured to synchronize their operation; and a processing unit (15) connected to the timing module (14) and configured to determine an axial location along the optical fiber (20) corresponding to the transient dip, based on the measured time interval.

The present invention relates to a method of detecting a zero-field resonance (ZFR), comprising the steps of i) directing a pump light beam in a first direction x through a vapor cell comprising gaseous atoms, ii) applying a magnetic field component to the vapor cell parallel or antiparallel to the first direction x with different magnitudes Bx,iapp, iii) detecting light of the pump light beam directed through the vapor cell for the different magnitudes Bx,iapp of the magnetic field component applied parallel or antiparallel to the first direction x, iv) determining the maximum optical transmission Tmax and the minimum optical transmission Tmin based on the detected light, v) determining the difference between the maximum optical transmission and the minimum optical transmission D = Tmax - Tmin, vi) determining the magnitude of the x-component of an ambient magnetic field Bxext by determining the particular magnitude Bxapp of the x-component of the applied magnetic field for which the minimum optical transmission Tmin is determined, vii) repeating at least steps i) to v) while applying magnetic field components to the vapor cell in second and third directions y and z perpendicular to the first direction x with different magnitudes By,iapp and Bz,iapp, and viii) determining the magnitudes Byext and Bzext of the ambient magnetic field components in the second and third directions y and z by determining the particular magnitudes of the y- and z-components of the applied magnetic field Byapp and Bzapp for which the difference between the maximum optical transmission and the minimum optical transmission D is minimized.

The present invention relates to a method of detecting a zero-field resonance (ZFR), comprising the steps of i) directing a pump light beam in a first direction x through a vapor cell comprising gaseous atoms, ii) applying a magnetic field component to the vapor cell parallel or antiparallel to the first direction x with different magnitudes: formula (I), iii) detecting light of the pump light beam directed through the vapor cell for the different magnitudes: formula (I) of the magnetic field component applied parallel or antiparallel to the first direction x, iv) determining the maximum optical transmission Tmax and the minimum optical transmission Tmin based on the detected light, v) determining the difference between the maximum optical transmission and the minimum optical transmission D = Tmax - Tmin, vi) determining the magnitude of the x-component of an ambient magnetic field: formula (II) by determining the particular magnitude: formula (III) of the x-component of the applied magnetic field for which the minimum optical transmission Tmin is determined, vii) repeating at least steps i) to v) while applying magnetic field components to the vapor cell in second and third directions y and z perpendicular to the first direction x with different magnitudes: formula (IV) and formula (V) and viii) determining the magnitudes: formula (VI) and formula (VII) of the ambient magnetic field components in the second and third directions y and z by determining the particular magnitudes of the y- and z-components of the applied magnetic field: formula (VIII) and formula (IX) for which the difference between the maximum optical transmission and the minimum optical transmission D is minimized.

The invention relates to a device for measuring intracorporeally generated magnetic fields, comprising: a catheter, wherein a fiber optic device is arranged within the catheter, a sensor unit for measuring magnetic fields, the sensor unit is a nitrogen vacancy center magnetometer, which, as a sensor medium, comprises diamond crystals having one or more nitrogen-vacancy centers, wherein one or more diamond crystals are arranged within the optical fiber device, wherein the sensor unit comprises a magnetic field generation device for generating a magnetic field in the area of ​​the sensor medium, wherein the sensor unit comprises an excitation light source for shining excitation light into the light guide device in order to excite the sensor medium, wherein the sensor unit comprises a microwave source for generating microwaves to excite the sensor medium with microwaves, and wherein the sensor unit comprises a photodetector for detecting resonance-dependent fluorescence light from the sensor medium and an evaluation unit which is set up to determine a magnetic field at the respective location of one or more diamond crystals based on the detected fluorescence light. The invention relates to a method for measuring intracorporeally generated magnetic fields, a computer program and a machine-readable storage medium.

A light receiving device receives fluorescence emitted by a magnetic resonance member in response to excitation light and generates a fluorescence sensor signal corresponding to a fluorescence intensity. A CMR arithmetic part performs common mode rejection with respect to the fluorescence sensor signal based on a reference light sensor signal of reference light that is obtained by branching the excitation light in consideration of nonlinearity of a level of the fluorescence sensor signal corresponding to an amount of the excitation light and generates a CMR signal. An A / D converter digitizes the CMR signal. An analog / digital converter digitizes the reference light sensor signal. An arithmetic processing device derives a measurement value of a measured field based on the digitized CMR signal and the digitized reference light sensor signal.

The invention relates to a method for generating a useful signal (11) from a signal (5') emanating from a spin-based quantum system (4), comprising exciting the spin-based quantum system (4) by an excitation light (13), exciting the spin-based quantum system (4) by an electromagnetic field (3) which oscillates between two measurement frequencies at a modulation frequency, wherein the two measurement frequencies have a first measurement frequency difference from an expected resonance frequency, detecting the signal (5') emanating from the spin-based quantum system (4) to obtain a measurement signal (7), multiplying the measurement signal (7) with a modulation signal (9) which oscillates between two modulation signal states at the modulation frequency to generate a modulated measurement signal (7'), demodulating the modulated measurement signal (7') to generate the useful signal (11), and determining a reference signal.and determining whether the expected resonant frequency value is correct, based on the reference signal.

Method for manufacturing a measuring probe (14), comprising the following steps: Insertion of two optical fibers (24, 26) and two electrical conductors (30, 32) into a sleeve (36); Filling the sleeve (36) with a carrier material, wherein the carrier material surrounds the glass fibers (24, 26) and / or electrical conductors (30, 32) at least partially; Curing of the carrier material in the sleeve (36); Polishing one end of the glass fibers (24, 26), electrical conductors (30, 32) and / or the carrier material contained in the sleeve (36); Arranging an RF antenna (34) on the top; and Transferring a quantum emitter (28) to the tip; Laser writing of a first and second optical fiber structure (42, 44) for optical connection of the quantum emitter (28) to the first optical fiber (24) and to the second optical fiber (26), wherein the first optical fiber (24) is optically decoupled from the second optical fiber (26).

A computer-implemented method is provided for evaluating at least one property of a plurality of buried objects, wherein the plurality of buried objects comprise a metallic material. The method comprises: receiving magnetic field data, wherein the magnetic field data comprises a plurality of magnetic field measurements, wherein each magnetic field measurement comprises a magnetic field value and three-dimensional measurement location information; determining a target set of buried objects, wherein the target set comprises estimated two-dimensional location information for each buried object in the target set; selecting the plurality of buried objects from the target set of buried objects based on the estimated two-dimensional location information; and performing a multiple-object inversion of a model of a magnetic field pattern affected by the plurality of buried objects, wherein the multiple-object inversion provides a respective value of the at least one property for each buried object of the selected plurality of buried objects that fits the received magnetic field data. Unlocking insights from Geo-Data, the present invention further relates to improvements in sustainability and environmental developments: together we create a safe and liveable world.

A sensor device is described. The sensor device comprises a source of fluorescence (1201, 1202, 1301, 1302), wherein said fluorescence is function of a physical phenomenon to be sensed and wherein said fluorescence is generated in response to an excitation provided by a source of excitation; a collector (1203, 1303) for collecting said fluorescence; a reflector (1210, 1310) placed around said source of fluorescence to reflect said fluorescence towards said collector, wherein said reflector is provided with an opening at its vertex, the source of fluorescence being arranged within said reflector to sense said physical phenomenon through said opening. A magnetometer comprising said sensor device is also disclosed.

A light receiving device 13 receives fluorescence emitted by a magnetic resonance member 1 correspondingly to excitation light and generates a fluorescence sensor signal corresponding to an intensity of the fluorescence. A CMR calculation unit 25 performs for the fluorescence sensor signal common mode rejection based on a reference sensor signal generated by receiving a reference light obtained as a branch of the excitation light and thereby generates a CMR signal. An analog-digital converter 26 digitizes the CMR signal and an analog-digital converter 27 digitizes a reference light sensor signal. The processor 31 divides the digitized CMR signal by the digitized reference light sensor signal and thereby generates a detection signal, and derives a measurement value of the measurement target field on the basis of the detection signal; and performs a noise-removal digital filter process for the digitized CMR signal or the detection signal.

The invention concerns a method for nonperturbative detection of one or more magnetic inhomogeneities resulting from nano-defects in a single longitudinal anisotropic magnetic sample structure having a nanometric cross-sectional dimension. A solid-state lattice with a single spin defect is used for magnetometry assessment of the anisotropic magnetic sample structure to determine quantitative information concerning minor defects and inconsistencies in the sample structure.

A spin sensor is provided which is formed from a single diamond particle, wherein a maximum diameter of the diamond particle is greater than or equal to 0.01 µm and less than 10 µm, the diamond particle has a color center, an electronic state of the color center has a spin ground level of spin zero and a spin excitation level of spin ±1, and a spin-spin relaxation time T2 of the diamond particle is 180 nsec or more.