69results about "Analysis using optical pumping" patented technology

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.

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 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 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.

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.

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

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 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.

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 relates to a measuring device (1) for detecting an electrophysiological process, comprising an ultrasound device (3) for transmitting and receiving ultrasound waves (8, 9) and a magnetic field detection device (2, 4) for detecting a magnetic field. The ultrasound device (3) and the magnetic field detection device (2, 4) are arranged relative to one another such that the magnetic field detected by the magnetic field detection device (2, 4) can be spatially associated with an ultrasound image that can be constructed from the ultrasound waves transmitted and received by the ultrasound device (3). The invention also relates to a method for detecting the electrophysiological process using the measuring device.

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 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.

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 method (200) for generating a tag from a crystalline structure (102) comprising at least one defect color center (104) and a plurality of non-zero spin nuclei (106) in the vicinity of each defect color center (104), the method comprising: applying (204) at least one microwave field sequence to the crystalline structure (102); applying (206) an optical radiation to the crystalline structure (102) to excite at least one defect color center; detecting (208), for at least one defect color center (104) and at least one nuclei of the plurality of non-zero spin nuclei (106) located in the vicinity thereof, a response of the crystalline structure (102); from the detected response, determining (210), by a processor (114), an atomic signature of the crystalline structure (102), said atomic signature comprising information of the non-zero spin nuclei distribution of the at least one defect color center (104); generating (212), by the processor (114), a unique tag based on the atomic signature.

A magnetic landing pad system 100, the system comprising: an aircraft landing pad 102 comprising a magnetic element 106 arranged to generate a magnetic field around the landing pad; and an aircraft 104 comprising a magnetometer and a control unit 110 coupled to the magnetometer 108; wherein the control unit is configured, based on a signal output from the magnetometer, to determine a location of the landing pad relative to the aircraft. Additional provided is a magnetic landing pad system (200, figure 4) comprising a landing pad (202) having a magnetometer (208) and a control unit (210) coupled to the magnetometer; and an aircraft (204) having a magnetic element (206) arranged to generate a magnetic field around the aircraft, and a second control unit (212) configure to wirelessly communicate with the landing pad control unit. Also provided is an aircraft landing pad comprising a magnetometer (208) arranged to detect magnet flux originating from a region above the landing pad; and a control unit (210) coupled to the magnetometer, the control unit configured based on a signal output from the magnetometer to determine a location from which the magnetic flux originates.

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.

To improve the accuracy of detecting a magnetic field.SOLUTION: A detection machine comprises: a diamond crystal in which an NV center is formed; a loop antenna provided on the diamond crystal; and a dielectric substrate. The NV center is arranged on one face of the diamond crystal. The dielectric substrate has a cylindrical shape opening at both an end on a detection target side in an axial direction and an end on the opposite side of the detection target side. In an axial direction view, an outer peripheral part of the diamond crystal is located on the outside of an inner peripheral part of the dielectric substrate and on the inside of an outer peripheral part of the dielectric substrate. The loop antenna is arranged on a surface of the diamond crystal on the opposite side of a surface where the NV center is formed, and is electrically connected to a high-frequency transmission line formed on the dielectric substrate.SELECTED DRAWING: Figure 1

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.