222results about "Analysis using electron paramagnetic resonanace" patented technology

The invention provides a fluorescent / photo-thermal dual-mode sensor constructed based on an entropy-driven DNA molecular machine as well as a construction method and application of the fluorescent / photo-thermal dual-mode sensor, and belongs to the technical field of sensor construction and analytical testing. The fluorescent / photo-thermal dual-mode sensor is constructed on the basis of Ag (at) Au NPRs with good photo-thermal performance, CdTe QDs with strong fluorescence signals, a Fe3O4 (at) SiO2 nano material with superparamagnetism and an entropy-driven DNA molecular machine signal amplification strategy capable of being specifically combined with miRNA; the fluorescence detection range of the fluorescence / photo-thermal dual-mode sensor is 1 fM to 50 pM, the detection limit is 0.34 fM, the photo-thermal detection range is 1 pM to 1 nM, and the detection limit is 0.5 pM; the fluorescent / photo-thermal dual-mode sensor is simple in construction method, convenient and rapid in detection and high in selectivity, has very good practicability and has very good application in miRNA detection.

An acoustically driven ferromagnetic resonance (ADFMR) device has a piezoelectric element comprised of piezoelectric material, first and second electrodes arranged in a vertical stack with the piezoelectric element to activate the piezoelectric element to generate an acoustic wave, a radio frequency voltage source electrically connected to the first electrode, a magnet comprised of a magnetostrictive material to receive the acoustic wave, the magnet being in the vertical stack with the first and second electrodes and the piezoelectric element, wherein the acoustic wave resonates at a ferromagnetic resonance of the magnetostrictive material, and a readout circuit to detect a change in the acoustic wave by detecting g one of an output voltage amplitude, a change in impedance or a reflection of the acoustic wave in the magnet to measure an unknown magnetic field in which the ADFMR device resides and as experienced at the magnetostrictive element.

A sensor element for checking the authenticity of a planar data carrier, in particular a banknote, has a spin resonance feature. The sensor element contains a magnetic core having an air gap, into which the planar data carrier can be inserted for authentication and which defines an axial direction extending between the adjoining surfaces of the magnetic core, a polarization device for generating a static magnetic flux in the air gap, a modulation device for generating a time-varying magnetic modulation field in the air gap, and a resonator for exciting the spin resonance feature of the data carrier to be checked. The modulation device is formed by at least one planar coil arranged in the air gap, which planar coil has one or more turns about the axial direction of the air gap in one plane. The disclosure also relates to a checking device having such a sensor element.

A sensor element for testing a flat-surface data carrier has a spin resonance feature. The sensor element includes a magnetic core with an air gap, into which the flat-surface data carrier can be inserted for testing, a polarization device for generating a static magnetic flux in the air gap, and a resonator device for exciting the spin resonance feature of the data carrier to be tested in the air gap. The resonator device contains at least two stripline resonators, which are designed and configured to be operated at different excitation frequencies.

A method for extracting information about one or more magnetic sources includes obtaining a first plurality of signals corresponding to magnetic sensor data generated by one or more magnetometers in an unshielded environment at a first time; receiving second information of a direction and a magnitude of a first known magnetic field applied to the one or more magnetometer, the first plurality of signals is acquired while the first known magnetic field is applied and wherein the first known magnetic field encodes directional information of the one or more magnetic sources into the first plurality of signals; extracting the information comprising three-dimensional spatial information of the one or more magnetic sources, respective orientations and strengths of the one or more magnetic sources based on the first information, the second information, and the plurality of signals corresponding to the magnetic sensor data.

A sensor element is for testing a planar data carrier with a spin resonance feature. The sensor element includes a magnetic core having an air gap into which the planar data carrier can be inserted for testing purposes, a polarization device for generating a static magnetic flux in the air gap, and a resonator device for exciting the spin resonance feature of the data carrier to be tested in the air gap. The resonator device has at least two stripline resonators positioned at different positions in the air gap. The polarization device generates an in-homogeneous magnetic flux in the air gap so that the static magnetic flux has a first field strength at the position of a first stripline resonator and a second, different field strength at the position of a second stripline resonator.

A diamond magneto-optical sensor includes: a diamond that includes a color center with an electronic spin and is irradiated with excitation light, and an irradiation unit that irradiates the diamond with the excitation light of the color center and electromagnetic waves for magnetic resonance, wherein the irradiation unit receives modulated light having been subjected to amplitude modulation, and a modulation frequency of the modulated light is included in a microwave frequency band.

The invention belongs to the technical field of petroleum and natural gas mineral geochemical experiment research, and discloses a research method for a mechanism of extracting elemental gold in hydrothermal fluid from crude oil. In-situ visualization experiments are carried out in a transparent fused quartz capillary tube, and analysis is carried out in combination with a scanning electron microscope, an energy dispersion X-ray spectrum and a transmission electron microscope, so that continuous evolution of water droplets near an interface of oil and a solution containing HAuCl4 at a high temperature is successfully proved. According to the method disclosed by the invention, hydration electrons released in a conversion process from OH <-> to OH < * > in the water droplets are extracted, the hydration electrons and H2O2 formed in the droplets have a synergistic effect, Au3 < + > is promoted to be reduced to form natural gold atoms, the atoms are gathered into nano-scale and micron-scale gold particles in a droplet coalescence process, and a clear and reasonable mechanism is provided for formation of elemental gold in crude oil extraction hydrothermal fluid.

The invention belongs to the technical field of terahertz, relates to terahertz communication, and particularly discloses a quasi-optical resonant cavity and a terahertz pulse compression system. According to the invention, the pulse generation module and the coupling compensation module are connected in parallel and are connected to the common reflector through the common coupler, so that function decoupling is realized. In a pulse compression stage, the common coupler introduces an incident terahertz wave beam into two optical paths, and destructive interference occurs between two paths of leakage signals by adjusting the coupling compensation module, so that zero coupling loss is realized, and the problem of large energy loss is solved. Meanwhile, the pulse generation module can independently adjust the optical path of the pulse generation module to control the pulse width, and the adjustment process does not affect the optimized interference condition, so that the high robustness of adjustment is ensured. In the output stage, energy is released by switching the state of the common coupler. Compared with the prior art, low-loss accumulation and robust pulse width continuous adjustment are realized at the same time, so that the terahertz pulse compression effect is remarkably improved.

A sensor element is for testing a planar data carrier that has a spin resonance feature. The sensor element includes: a magnetic core having an air gap into which the planar data carrier can be inserted for testing purposes; a polarization device for generating a static magnetic flux in the air gap; and a resonator device for exciting the spin resonance feature of the data carrier to be tested in the air gap. The resonator device has a stripline resonator and a supply structure for the stripline resonator and is designed to generate a high-frequency field with circular polarization owing to the geometry of the stripline resonator and / or the geometry of the supply structure.

A diamond magneto-optical sensor (100) includes: a diamond (102) including a color center with an electronic spin, a transmission circuit (106) that transmits electromagnetic waves, and an irradiation unit that irradiates the diamond (102) with electromagnetic waves transmitted by the transmission circuit (106), wherein the transmission circuit (106) includes an impedance converter (108) that reduces or increases, with respect to the irradiation unit, the impedance of an electromagnetic source (110) for outputting electromagnetic waves.

An inductive assembly is provided that can be used to achieve a large effective volume for excitation and detection and high concentration sensitivity, preferably with low power consumption. [Solution] The present invention relates to an inductive array particularly for use in an oscillator arrangement for generating and / or detecting magnetization of a sample, having a plurality of inductive segments, each of which has an inductive element and a connection circuit electrically connected to the inductive element for electrically connecting to adjacent inductive segments.

To perform nuclear magnetic resonance sensing for accurately detecting a low-level NMR signal and having high resolution.SOLUTION: A nuclear magnetic resonance sensing unit 1 applies a high frequency magnetic field based on an RF signal to an object and generates an observation signal of a frequency obtained by shifting from RF signal frequency by NMR signal frequency. A mixer unit 6 generates an IF demodulation signal including the NMR signal. A lowpass filter 7 transmits low-frequency band components of the IF demodulation signal. A digitizing device 21 causes: a physical field generator to generate magnetic field and the like corresponding to the IF demodulation signal transmitting through the lowpass filter 7; an optical quantum sensor unit to generate light corresponding to the magnetic field and the like using a sensing member; a photoelectric element to convert the light into a sensor signal; and an analog / digital converter to digitize the sensor signal. The optical quantum sensor unit performs quantum operation to the above-mentioned sensing member to cause the sensing member to generate light corresponding to the above-mentioned magnetic field and the like.SELECTED DRAWING: Figure 1

The invention relates to a compound of formula (I) wherein n = 1 or 2, A and A'are independently selected from the group consisting of the following substituents (II-a) and (II-b), R and R 'are independently selected from H and a linear or branched C1-C3 alkyl group, Z is selected from a linear or branched C1-C4 alkyl group and an aryl group optionally substituted by a linear or branched C1-C3 alkyl group and / or by a hydroxyl group, and the structural unit of formula (N) is selected from the following structural units (III-a), (III-b), (III-c), (III-d) and (III-e) wherein for each structural unit (III-a), (III-b), (III-c), (III-d) and (III-e), Ra, Rb, Rc and Rd are independently selected from a linear or branched C1-C4 alkyl group. .

The invention relates to the field of electron paramagnetic resonance spectrum testing equipment, in particular to a sampling device for in-situ testing of an electron paramagnetic resonance spectrum. A sample introduction device for electron paramagnetic resonance spectrum in-situ testing comprises a micro-fluidic chip, a clamping assembly, a sample introduction pipe A, a sample introduction pipe B and a split type injection pump, and a sample introduction port A, a sample introduction port B and a sample outlet are formed in the micro-fluidic chip; one end of the sample injection pipe A is communicated with the sample injection port A, and the other end of the sample injection pipe A is communicated with the split type injection pump; one end of the sample injection pipe B is communicated with the sample injection port B, and the other end of the sample injection pipe B is communicated with the split type injection pump; a sample outlet of the micro-fluidic chip is communicated with a quartz test tube. Rapid switching of reactant concentration or solvent proportion can be achieved by controlling the flow speed of the A / B tube, a tedious sample preparation process is not needed, and the suitability and flux of electron paramagnetic resonance spectrum in-situ testing can be greatly improved.

A method for time-resolved pump-probe resonance spectroscopy, comprising the steps of:-exposing a sample (4) to a radio frequency pump pulse (20), where the radio frequency pump pulse (20) drives a resonance, where the resonance is electron spin resonance and / or nuclear magnetic resonance, where the sample (4) is located within a magnetic bias field (22); -detecting the sample (4) with an electron detection beam (7) from the electron source (6); detecting a detection beam characteristic of the electron detection beam (7) by means of a detector unit (8), the detection beam characteristic being dependent on a magnetic moment (25) of the sample (4), the magnetic moment (25) being dependent on the driven resonance, the detector unit (8) being configured to detect the detection beam characteristic of the electron detection beam (7) at a temporal resolution for time-resolved detection of the driven resonance; and determining a property of the resonance, in particular a state of the resonance, preferably a change in the state of the resonance, on the basis of the detected probe beam property.

Disclosed is a method for characterising a sample (E), said method comprising magnetically coupling the sample to a microwave resonator (RHS) such that the coupling dominates the relaxation dynamics of an electron spin (SEL) of a paramagnetic centre of the sample, and determining, by nuclear-magnetic-resonance spectroscopy, coefficients Cij of coupling between a nuclear spin of the sample, called the probe nuclear spin (SNi), and other nuclear spins (SNj, SNk) of the sample, said method employing indirect detection of a state of said probe nuclear spin (SNi), through counting of microwave photons, of respective noise signals (SBS) produced by the return to equilibrium of said electron spin (SEL). An apparatus for implementing such a method is also disclosed.

The invention refers to a quantum sensor device for measuring a magnetic field using fluorescence dependence on the magnetic field, the quantum sensor device (18) comprising a substrate made of single-crystal diamond, and nitrogen atoms in the substrate, the nitrogen atoms being partially present in the form of negatively charged nitrogen-vacancy (NV-) centres, wherein a ratio of the concentration of NV- centres to the concentration of the nitrogen atoms in the substrate is at most 14%.

The invention relates to a method for detecting in-situ free radicals in a hydroxylamine nitrate catalytic decomposition process, which comprises the following steps: 1, catalytic decomposition: catalyzing a hydroxylamine nitrate solution to decompose by using a metal supported catalyst to obtain a decomposition solution; step 2, OH <-> detection: adding an OH <-> free radical scavenger solution into the decomposition liquid obtained in the step 1 to obtain a stable OH <-> free radical adduct, namely a DMPO-OH <-> free radical adduct; step 3, NO. Detection: adding a NO. Free radical scavenger solution into the decomposition liquid obtained in the step 1 to obtain a stable NO. Free radical adduct, namely an (MGD) 2-Fe < 2 + >-NO. Free radical adduct; 4, EPR detection, wherein OH. Free radical adducts and NO. Free radical adducts obtained in the step 2 and the step 3 are detected through an electron paramagnetic resonance instrument. The detection method has the characteristics of proper magnetic field penetration depth, no background interference, continuous and repeated detection and the like.

A high-frequency magnetic field generator 2 applies microwave to a magnetic resonance member 1. 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 incident light of a specific wavelength. An FT 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. A pillar-shaped light guide member 41 guides the incident light to the magnetic resonance member 1, and a pillar-shaped light guide member 42 guides fluorescence that the magnetic resonance member 1 emits from the magnetic resonance member 1. Further, the magnetic resonance member 1 is arranged between an end surface of the light guide member 41 and an end surface of the light guide member 42 in a hollow part of the secondary coil 4b of the FT 4 and in a hollow part of the aforementioned magnet 3.

A light receiving device 13 receives fluorescence emitted by a magnetic resonance member 1 in response to an excitation light and generates a fluorescence sensor signal corresponding to a fluorescence intensity. An arithmetic processing device 31 derives a measurement value based on the fluorescence sensor signal or a detection signal that is obtained from the fluorescence sensor signal. A measurement value, which is measured when the measured field is applied to the magnetic resonance member 1, is defined as a main measurement value. A measurement value, which is measured when the measured field is not applied to the magnetic resonance member 1 and before the main measurement value is measured, is defined as a preceding measurement value. A measurement value, which is measured when the measured field is not applied to the magnetic resonance member and after the main measurement value is measured, is defined as a succeeding measurement value. The arithmetic processing device 31 respectively subtracts the preceding measurement value and the succeeding measurement value from the main measurement value at a predetermined ratio to derive the measurement value of the measured field.

The present disclosure provides a method for production line nuclear magnetic resonance (NMR) measurement of a fluid containing one or more evaluated materials. The method includes positioning a reference sample with a known reference material and a sample of the fluid within a sensing region of an NMR measurement unit coil and a magnetic field of a permanent magnet. An NMR measurement is performed by feeding at least one radio frequency coil with a signal having a spectrum including characteristic frequencies of the evaluated materials and the reference material, generating detection signals. The detection signals are processed to provide an NMR spectrum with a reference peak and additional peaks. The signal is adjusted based on changes over time of the reference peak frequency, and a band pass frequency range of a receiving unit is adjusted based on the reference peak frequency.

The invention discloses a mirror image tuning method based on an electron paramagnetic resonance spectrometer and a storage medium, and the method comprises the steps: obtaining a sample path signal generated by a microwave link and a noise reference signal generated by a noise mirror image link, and generating a main path tuning curve according to the sample path signal, generating a mirror image main path tuning curve according to the noise reference signal; according to the main path tuning curve, controlling a microwave source to generate a microwave signal of which the frequency is the same as the sample resonant frequency of a to-be-detected sample in a sample resonant cavity on the main path; and adjusting the frequency and the reference path of the sample resonant cavity according to the main path tuning curve, adjusting the frequency of the mirror image resonant cavity on the mirror image main path according to the frequency of the sample resonant cavity, and adjusting the mirror image reference path according to the mirror image main path tuning curve. According to the method, the correlation between the sample path signal and the noise reference signal is improved, the effect of carrying out noise suppression on the sample path signal according to the noise reference signal is further improved, and the signal-to-noise ratio of the EPR is effectively improved.

A high-frequency magnetic field generating device includes a plate coil and a high-frequency power supply that generates microwave current that flows in the plate coil, wherein one edge line part in a top end side and one edge line part in a bottom end side among four edge line parts of the plate coil act as two coils arranged with a predetermined gap in parallel with each other, wherein between the two coils an electron spin resonance material is arranged or the coils are arranged at one side from an electron spin resonance material. The high-frequency magnetic field generating device further includes a circuit board, wherein the two coils are arranged on one surface of the circuit board so as to be substantially perpendicular to the one surface.

The use of a cell-permeant molecular probe to assay the presence, and monitor the production, of the reactive oxygen species, superoxide, in red blood cells (RBCs) is described. The assay is performed using electron paramagnetic resonance (EPR) spectroscopy and a cell-permeant hydroxylamine spin trap. The cell-permeant molecular probe is not detected or quantifiable by EPR in its reduced form. However, upon entering the RBCs, the probe is oxidized by reacting with superoxide to yield a stable nitroxide radical that is detected and quantified using EPR. Our studies indicate that superoxide production is consistent with RBC metabolism that predicts lipid oxidation, membrane injury and poor post-transfusion performance. Therefore, measurement of reactive oxygen species can be used as an indicator of RBC quality at the time of donation and after storage.

The present invention relates to an in-operando and non-destructive testing system (10) for testing the aging of at least one electrochemical element of a battery, the in-operando and non-destructive testing system (10) comprising: - a cavity (30); - a source (24) configured to emit L-band electromagnetic waves toward the cavity (30), the cavity (30) comprising a cylindrical resonator (38) with a circular base and having at least one longitudinal cut-out (46, 48); - a detector (28) capable of detecting the waves originating from the cavity (30); and - a processor (34) capable of analyzing the waves detected by the detector (28) in order to obtain at least one item of information relating to the aging of the at least one electrochemical element.

A diamond magneto-optical sensor (100) according to the present invention includes: a diamond (102) having a color center that has an electron spin; a transmission circuit (106) that transmits electromagnetic waves; and an irradiation part that irradiates the diamond (102) with electromagnetic waves transmitted by the transmission circuit (106). The transmission circuit (106) includes an impedance converter (108) for decreasing or increasing, when viewed from the irradiation part, impedance of an electromagnetic wave source (110) that outputs electromagnetic waves. The irradiation part includes a resonator (104).

A device (10a) for imaging a sample (12) including a material that interacts with microwave radiation is provided The device (10a) comprises a sample holder (16) for supporting the sample (12) in a sample area, a quantum sensor device (18) configured to be arranged adjacent to the sample area, the quantum sensor device (18) including colour sensors, an excitation light source (30) configured to generate excitation light for energetically exciting the colour sensors, an optical sensor (32) including a plurality of pixels and configured to generate electronic signals indicative of an intensity of the light emitted by the colour sensors, imaging optics (28) for projecting the sensor area onto the optical sensor (32), a microwave source (20) having a microwave antenna for emitting microwave radiation, the microwave source (20) being configured to generate microwave radiation that is characterized by a plurality of parameters, and a controller (24). The sample holder (16) supports the sample (12) such that the sensor area is in the near-field of the microwave radiation interacting with the sample (12), wherein the controller (24) is configured to vary at least one parameter of the microwave radiation at least between a first value and a second value, record – for each pixel – the electronic signals received from the optical sensor (32) for the microwave radiations generated using the first value and the second value, determine – for each pixel – changes in the electronic signals between the microwave radiations generated using the first value and the second value, and generate an image based on the changes for each pixel, the changes for each pixel indicating variations in the interaction of the microwave radiation with the sample (12).

The invention relates to application of a metal fullerene-organic framework composite spinning functional material in oxygen detection, and belongs to the technical field of metal fullerene composite materials. The metal fullerene-organic framework composite spinning functional material has sensitive response characteristics to oxygen molecules, and realizes real-time in-situ monitoring of oxygen gas adsorption, diffusion and concentration change processes by combining an electron paramagnetic resonance technology, so that a new method is added for an oxygen analysis technology, and oxygen analysis requirements under different working conditions are met.