33results about "Measurements using double resonance" patented technology

In a general aspect, a magnetic resonance system performs magnetic resonance measurements. In some examples, a magnetic resonance system includes a data processing device and a superheterodyne spectrometer system. The data processing device generates digital intermediate frequency (IF) signal information based on the pulse profile. The digital IF signal information is configured to suppress a mirror sideband in the magnetic resonance control signal. The superheterodyne spectrometer generates a magnetic resonance control signal based on the digital IF signal information.

The invention relates to a quantum sensor (1), in particular for magnetic field measurement, comprising: a sensor element (4) in the form of a crystal doped with color centers (5), in particular a diamond crystal doped with NV centers, wherein the color centers (5) are designed to generate fluorescent light (7) upon excitation with excitation light (6), a carrier substrate (2) having a surface (2a) to which the sensor element (4) is attached, and a detector (8), in particular a photodiode, for detecting the fluorescent light (7). In the quantum sensor (1), the carrier substrate (2) has a waveguide (3) for supplying the excitation light (6) to the sensor element (4).

In a general aspect, a magnetic resonance system performs a magnetic resonance measurement. In some examples, a magnetic resonance system includes data processing apparatus and a superheterodyne spectrometer system. The data processing apparatus generates digital intermediate frequency (IF) signal information based on a pulse profile. The digital IF signal information is configured to suppress an image sideband in a magnetic resonance control signal. The superheterodyne spectrometer generates the magnetic resonance control signal based on the digital IF signal information.

The invention relates to a sensor head (4a-d) for a frequency analyzer (2a-d) comprising a crystal defect resonator (20a-d), an optical pump emitter (14) for exciting the crystal defect resonator (20a-d), a magnetic field unit (30) for generating a magnetic field with a magnetic field gradient along the crystal defect resonator (20a-d), an RF waveguide (22) and a radiation detector (10) for detecting luminescence radiation (42) from the crystal defect resonator (20a-d). To achieve easy manufacturability of the frequency analyzer (2a-d), it is proposed that the crystal defect resonator (20a-d) has a polycrystalline structure.

In a general embodiment, a magnetic resonance system performs magnetic resonance measurements. In some examples, the magnetic resonance system includes a data processing unit and a superheterodyne spectrometer system. The data processing unit generates digital intermediate frequency (IF) signal information based on the pulse profile. The digital IF signal information is configured to suppress image sidebands in the magnetic resonance control signal. The superheterodyne spectrometer generates the magnetic resonance control signal based on the digital IF signal information.

The invention relates to a sensor unit (200) for measuring a magnetic field, comprising at least two sensor media (201, 202, 203) arranged at a fixed distance from each other, at least one excitation light source (220) for shining light (224) into the at least two sensor media (201, 202, 203), at least one microwave source (241, 242, 243) for generating an alternating magnetic field in the at least two sensor media (201, 202, 203), a device for generating a bias magnetic field (B0) having different magnetic field strengths at the locations of the at least two sensor media (201, 202, 203), an optical collecting device for combining fluorescent light (225) emitted from the at least two sensor media (201, 202, 203), and a photodetector (230) for detecting the combined Fluorescence light (225),at least one signal processing unit for determining a gradient of the magnetic field from the detected fluorescence light (225).,

The present invention relates to an apparatus (100) and method for investigating a sample by using nuclear magnetic resonance, particularly zero- to ultra-low- field nuclear magnetic resonance, the apparatus (100) comprising: - a magnetically shielded chamber (20) for magnetically shielding the sample from external static magnetic fields; - magnetic field pulse generation means (30) arranged in the magnetically shielded chamber (20) and configured to manipulate nuclear spins present in the sample, thereby causing the sample to produce a magnetic signal; and - at least one magnetoresistive sensor (40) comprising a ferromagnetic material, wherein the at least one magnetoresistive sensor (40) is arranged in the magnetically shielded chamber (20) and configured to detect the magnetic signal produced by the sample.

The invention relates to a position sensor with several separate sensor elements (SE), each of which is individually optically queried and read out separately. Each sensor element is connected to an associated detector via an individual optical transmission path, in particular a high-temperature-resistant optical waveguide. This makes the sensor particularly suitable for applications at elevated temperatures. The sensor elements can comprise various paramagnetic centers, including those other than classic NV centers, and different host materials. Each sensor element can be individually irradiated with time-modulated pump light, thus enabling separate evaluation of the intensity and / or phase shift of the fluorescence. The detected signals are optionally evaluated using computer-implemented methods, such as machine learning.The sensor elements are also assigned to specific coded magnetic areas, enabling error detection, error correction or unambiguous position determination.

The invention relates to an NMR-DNP probe comprising a sample holder, a temperature control device, a microwave guide and an illumination device, characterized in that the temperature control device comprises a VT channel through which a temperature control fluid can be supplied to the sample container for temperature control of the sample substance in NMR measurement mode, a sample-side end of the light guide is arranged in the VT channel, and a deflection mirror is arranged in the VT channel between the sample-side end of the light guide and the sample container, which directs the light exiting the light guide onto the sample substance in the sample volume of the sample container. This allows additional light excitation with adjustable beam width to illuminate the NMR test sample within the probe without negatively affecting the magnetic field or RF. Furthermore, optical excitation in the UV range can also be realized. The optical fiber is integrated into the probe with a very small bending radius. The invention also relates to a bearing bushing for use in an NMR-MAS probe and to an NMR spectrometer.

A system and method for increasing the nuclear spin polarization of a target compound are disclosed. [Solution] According to this system and method, a first non-thermal equilibrium nuclear spin polarization may be conferred to a source atom of at least one source compound, the source atom having a nuclear gyromagnetic ratio of at least 12 megahertz (MHz / T) per tesla. A first solution containing the source compound and the target compound can be obtained. At least one source atom can be present in the first solution at a source concentration of at least 0.1 moles (M). At least 0.01% of a second non-thermal equilibrium nuclear spin polarization can be conferred to at least one target atom of the target compound via nuclear Overhauser effect (NOE) transfer of the first non-thermal equilibrium nuclear spin polarization to at least one target atom.

In a general aspect, a split-planar microwave resonator device for electron spin resonance is described. In some aspects, a microwave resonator device for electron spin resonance includes parallel first and second substrates that are spaced apart from each other by a separation distance. The microwave resonator device includes a first ground plane disposed on the first substrate; a second ground plane disposed on the second substrate; a first transmission line resonator patterned on the first substrate; and a second transmission line resonator patterned on the second substrate. The first transmission line resonator is configured to produce a first microwave field in a sample region between the first and second substrates; and the second transmission line resonator is configured to produce a second microwave field in the sample region. In some examples, the first and second microwave transmission line resonators are made of superconducting material.

The invention relates to a magnetic field sensor (1) with an NV diamond (2), an excitation light source (3) configured to emit an excitation beam (4) for exciting electronic states of the NV diamond (2), and arranged such that the excitation beam (4) emitted by it can generate an electric field within the NV diamond (2), a detector (5) arranged and configured to detect fluorescence radiation that the NV diamond (2) can emit as a result of irradiation with the excitation radiation (4), a microwave structure (6) arranged and configured to generate a microwave field within the NV diamond (2) for manipulating spin states of the NV diamond (2), a magnetic field generating device (7) configured to generate an internal, static magnetic field within the NV diamond (2), and comprising at least one permanent magnet (8), and a hood (10). and a base plate (11),which are arranged to form a closed chamber (12). The NV diamond (2), the excitation light source (3), the detector (5), and the microwave structure (6) are arranged within the closed chamber (12). The hood (10) has at least one recess (13) for receiving the at least one permanent magnet (8, 9).

In a general aspect, a magnetic resonance system performs a magnetic resonance measurement. In some examples, a magnetic resonance system includes data processing apparatus and a superheterodyne spectrometer system. The data processing apparatus generates digital intermediate frequency (IF) signal information based on a pulse profile. The digital IF signal information is configured to suppress an image sideband in a magnetic resonance control signal. The superheterodyne spectrometer generates the magnetic resonance control signal based on the digital IF signal information.

The invention relates to a method and a device for evaluating a measurement signal (5') emanating from a spin-based quantum system (4), comprising exciting the spin-based quantum system (4) by a pulsed excitation light (13; 220), alternately exposing the spin-based quantum system (4) to a first and a second series of magnetic field pulses (211; 212), wherein one of the first and second series of magnetic field pulses (211; 212) consists of two π 2 − Pulse contains, and the other of the first and second magnetic field pulse sequence (211; 212) a π 2 − Puls 2 and one − π 2 − Puls includes, a detection of the measurement signal (5') emanating from the spin-based quantum system (4), an integration of the measurement signal (5') over an integration window (231) containing a signal time of a light pulse (222) of the pulsed excitation light (13; 320) between the first magnetic field pulse sequence (211) and the second magnetic field pulse sequence (212) and between the second magnetic field pulse sequence (212) and the first magnetic field pulse sequence (211) to obtain a first and a second signal value, and a determination of a measured value from the first and the second signal value.

The invention relates to a high-temperature position sensor based on NV centers in diamond. The special features of the position sensor are, firstly, the thermal separation between the sensor elements with the NV centers on the one hand and the evaluation electronics on the other, and secondly, the ability to detect up to six degrees of freedom, for example, when implemented as a magnetic field camera, by evaluating the contrast of different areas of a fluorescence image, each of which represents different areas of the surface of a magnetized body with different area magnetization.

A system and method for increasing the nuclear spin polarization of a target compound are disclosed. According to such a system and method, a first non-thermal equilibrium nuclear spin polarization may be imparted to source atoms of at least one source compound, the source atoms having a nuclear gyromagnetic ratio of at least 12 megahertz per Tesla (MHz / T). A first solution including a source compound and a target compound can be obtained. The at least one source atom can be present in the first solution at a source concentration of at least 0.1 molar (M). A second non-thermal equilibrium nuclear spin polarization of at least 0.01% can be imparted to at least one target atom of the target compound via a Nuclear Overhauser Effect (NOE) transfer of the first non-thermal equilibrium nuclear spin polarization to at least one target atom.

Described herein is a molecular imaging system comprising two or more MRI coils or coil arrays, where at least one coil is tuned to 1H resonance frequency and at least one coil is tuned to the resonance frequency of a nuclei such as 19F, 31P, 129Xe, 13C or 23Na. The imaging system may also contain passive frequency-selective flux focusing RF elements that are utilized to amplify the generated RF signal and, therefore, maximize the sensitivity and overall performance of the imaging system.

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.

Systems and methods are disclosed for increasing a nuclear spin polarization of a target compound. In accordance with such systems and methods, a first non-thermal equilibrium nuclear spin polarization can be imparted to at least one source atom of a source compound, the source atom having a nuclear gyromagnetic ratio of at least 12 megahertz per tesla (MHz / T). A first solution can be obtained that includes the source compound and a target compound. The at least one source atom can be present in a source concentration of at least 0.1 molar (M) in the first solution. A second non-thermal equilibrium nuclear spin polarization of at least 0.01% can be imparted to the at least one target atom of the target compound via a nuclear Overhauser effect (NOE) transfer of the first non-thermal equilibrium nuclear spin polarization to the at least one target atom.

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.

In a general aspect, a magnetic resonance system performs a magnetic resonance measurement. In some examples, a magnetic resonance system includes data processing apparatus and a superheterodyne spectrometer system. The data processing □ apparatus generates digital intermediate frequency (IF) signal information based on a pulse profile. The digital IF signal information is configured to suppress an image sideband in a magnetic resonance control signal. The superheterodyne spectrometer generates the magnetic resonance control signal based on the digital IF signal information.

Sensor device (10) comprising a crystal body (12), in particular a diamond, with a number of color centers, a light source (18) for generating a light beam (20) for irradiating the crystal body (12) with the light beam (20), a high-frequency device (16) for generating microwaves for irradiating the crystal body (12) with the microwaves, a detector (52) configured to detect fluorescence light generated by irradiating the crystal body (12) with the light beam (20) and with the microwaves from color centers, and a beam guidance system (22) for guiding the light beam (20) from the light source (18) to the crystal body (12). The crystal body (12) has an input coupling area (38) for coupling the light beam (20) into the crystal body (12) and an output coupling area (40) for coupling the light beam (20) out of the crystal body (12).The beam guidance system (22) is designed to guide the light beam (20) coupled out of the coupling area (40) back to the coupling area (38).

In a general aspect, a magnetic resonance system performs a magnetic resonance measurement. In some examples, a magnetic resonance system includes data processing apparatus and a superheterodyne spectrometer system. The data processing apparatus generates digital intermediate frequency (IF) signal information based on a pulse profile. The digital IF signal information is configured to suppress an image sideband in a magnetic resonance control signal. The superheterodyne spectrometer generates the magnetic resonance control signal based on the digital IF signal information.

The present invention describes a method for determining compensated measured values ​​of at least two physical quantities using a sensor system. The sensor system comprises at least one sensor element (SE) with crystals containing color centers. Both the first and the second physical quantities act on the sensor element (SE). A computer system (RSYS) controls the method. First, the sensor element (SE) is irradiated with modulated pump radiation (LB). Program code and configuration parameters for carrying out a correction procedure are provided, these parameters being stored in a memory of the sensor system or the computer system (RSYS). The fluorescence radiation (FL) of the color centers, which is influenced by the physical quantities, is detected.Fluorescence parameters are determined from the time course of the intensity of the fluorescence radiation (FL) and the pump radiation (LB) and represented as vector components of a fluorescence vector (Fv). An initial measurement of the first physical quantity is obtained by mapping the fluorescence vectors onto a sensor state vector (Sz), for example, using a neural network model with configuration parameters determined by a training program. This ensures that the initial measurement depends only on the first physical quantity and not on the second, resulting in a compensated measurement. This compensated measurement is then output, stored, transmitted, or used further.

It provides digital operation for magnetic resonance systems. [Solution] In a general embodiment, a magnetic resonance system performs magnetic resonance measurements. In some examples, the magnetic resonance system includes a data processing unit and a superheterodyne spectrometer system. The data processing unit generates digital intermediate frequency (IF) signal information based on a pulse profile. The digital IF signal information is configured to suppress image sidebands in the magnetic resonance control signal. The superheterodyne spectrometer generates a magnetic resonance control signal based on the digital IF signal information.

The present invention relates to a device for measuring a line current. This device comprises at least three sensor elements with paramagnetic centers, a pump radiation source, an optical system, and at least three photodetectors, which function as part of receiving systems and are each assigned to a sensor element. Additionally, the device includes two magnetic field sources that set different bias fields for each sensor element. The pump radiation source emits pump radiation into the optical system, which distributes it to the sensor elements, thus irradiating the paramagnetic centers with the pump radiation. These centers emit fluorescence radiation, the intensity and phase shift of which depend on the AC drive signal of the evaluation and control device and the magnetic flux density acting upon it. The fluorescence radiation is separated from the pump radiation by the optical system and directed to the photodetectors. The evaluation and control device generates a monofrequency sinusoidal AC drive signal with a frequency of 22 MHz (-4 MHz / +7 MHz) or within a range of 18 MHz to 29 MHz. The lock-in amplifiers are coupled to the sensor elements and evaluate the output signal of the photodetectors with respect to the AC drive signal to generate measured values. Based on these measured values, the evaluation and control device determines an estimated value for the magnitude of the current in the line.

The present invention describes a method for determining compensated measured values ​​of at least two physical quantities using a sensor system. The sensor system comprises at least one sensor element (SE) with crystals containing color centers. Both the first and the second physical quantities act on the sensor element (SE). A computer system (RSYS) controls the method. First, the sensor element (SE) is irradiated with modulated pump radiation (LB). Program code and configuration parameters for carrying out a correction procedure are provided, these parameters being stored in a memory of the sensor system or the computer system (RSYS). The fluorescence radiation (FL) of the color centers, which is influenced by the physical quantities, is detected.Fluorescence parameters are determined from the time course of the intensity of the fluorescence radiation (FL) and the pump radiation (LB) and are used as vector components of a fluorescence vector (F). v ). A first measurement of the first physical quantity is represented by mapping the fluorescence vectors onto a sensor state vector (S). z For example, the first measurement is determined using a neural network model, employing configuration parameters defined by a training program. This ensures that the first measurement depends only on the first physical quantity and not on the second, resulting in a compensated measurement. This compensated measurement is then output, stored, transmitted, or used further.

The invention relates to a magnetometer (1) with a resonator (2) having a first mirror (21) arranged at a first end of the resonator (2) and a second mirror (22) arranged at a second end of the resonator (2), the second end being opposite the first end; an absorber (3) containing or consisting of diamond, arranged in the resonator (2), the diamond containing color centers; a first pump light source (4) configured to emit pump light with which the color centers in the absorber (3) can be excited from a ground state to an excited state; a measuring light source (5) configured to emit measuring light which can be absorbed by a singlet intermediate state of the color centers in the absorber (3);a high-frequency (HF) source (6) configured to emit HF radiation resonant with the transition energy between a ground state and an excited state of the color centers in the absorber (3); and a photodetector (7) configured to measure the optical power of the measuring light in order to determine the strength and direction of a magnetic field from the attenuation of the measuring light in the absorber (3); wherein the first pump light source (4) is configured to provide pump light with a power density of 40 kW·m²; -2 up to 150 kW·m -2 to emit. Furthermore, the invention relates to a method for detecting a magnetic field.

The invention relates to a method for evaluating a measurement signal (5') emanating from an NV quantum system (4), comprising exciting the NV quantum system (4) by a pulsed excitation light (13; 320) to bring the NV quantum system (4) into the spin state |m s = 0> to initialize, excitation of the NV quantum system (4) by an alternating magnetic field (3; 310) which alternately has two different field states, wherein the NV quantum system (4) is brought into the spin state |m by an alternating magnetic field (3; 310) which has the first of the two field states. s = +1> can be converted, and by an alternating magnetic field (3; 310), which has the second of the two field states, into the spin state |m s= -1> can be converted, a detection of the measurement signal (5') emanating from the NV quantum system (4), an integration of the measurement signal (5') over an integration window (331) containing a signal time of a first light pulse (322) in order to obtain a signal value, an integration of the measurement signal (5') over an integration window (332) containing a signal time of a second light pulse (322) in order to obtain a reference value, wherein the first and the second light pulse are two time-displaced light pulses of the excitation light (13; 320), wherein the first light pulse (322) is generated after the alternating magnetic field (3; 310) which has the first of the two field states, and wherein the second light pulse (322) is generated after the alternating magnetic field (3; 310) which has the second of the two field states, and a determination of a measured value from the signal value and the reference value.