15results about "Susceptibility measurements" patented technology

The invention relates to the technical field of ultra-low field magnetic resonance systems, in particular to a battery charge state detection method and system based on closed-loop adaptive ultra-low field MRI, and the method comprises the steps: collecting the phase change of a water molecule H signal caused by the magnetic field disturbance of a to-be-detected battery, and reconstructing a first signal phase image; extracting to obtain a high-information-content area mask, and then performing resampling to obtain a second signal phase image; and inputting the second signal phase image into a state-of-charge detection model to predict a state-of-charge value of the to-be-detected battery. In order to solve the problem that a battery magnetic resonance detection scheme in the prior art needs to adopt a high-field magnetic resonance system and is not beneficial to production line use, detection equipment is replaced with an ultralow-field magnetic resonance system, so that structures such as a shielding room in a traditional magnetic resonance system are omitted, and a high-information-content area is positioned firstly, so that the detection efficiency is improved; and resampling is carried out on the region, so that the imaging precision is improved, and the accuracy of state of charge estimation of the detection model is improved.

A probe (303; 403) for sensing a magnetic marker, comprising a first coil set (313; 413) including a first coil of a first coil type, e.g., a sense coil (305; 405), disposed between a first pair of coils of a second coil type, e.g., a drive coil (301a, 301b; 401a, 401b) connected in series, and a balance element (317; 417) axially spaced from the first coil set (313; 413) along the length of the probe (303; 403). The balance element (317; 417) is configured or arranged to generate a sense voltage that fully offsets, partially offsets, or minimizes a sense voltage induced in one or more sense coils (305; 405) of the first coil set from the drive coil or coils (301a, 301b; 401a, 401b). A detection system is also disclosed, comprising the probe (303; 403), a magnetic field generator configured to drive an alternating magnetic field through the drive coils (301a, 301b; 401a, 401b) of the first coil set and the balance element (317; 417), and at least one detector configured to receive a signal indicative of a sensed voltage.

An external field response distribution visualization device (100) includes: a sensing circuit (110) that induces a first field component from each of a plurality of sensing positions; a sensor (130) that senses the intensity of the field at a plurality of sensing positions for each of the plurality of sensing positions; and an information processing circuit (150) that generates an image representing the external field response distribution, the information processing circuit (150) calculating a sensing position-dependent field function that inputs a sensing position and a sensing position and outputs the intensity of the field using the sensing result as a boundary condition, calculating an imaging function that is a function that inputs an imaging target position and outputs an image intensity, is a function determined based on the intensity output from the sensing position-dependent field function by inputting the imaging target position to the sensing position-dependent field function, and generating the image based on the imaging function.

The application relates to the technical field of magnetic measurement, and discloses a method for measuring AC magnetic susceptibility, which comprises the following steps: controlling a first excitation coil and a second excitation coil arranged in pairs in an alternating gradient magnetometer to generate a uniform alternating magnetic field in a sample seat region; when frequency conversion testing is performed, the frequency of the uniform alternating magnetic field is adjusted, and a first induction signal of a differential detection coil is acquired; wherein the sample seat is located in a measurement region of the differential detection coil; and the AC magnetic susceptibility of a sample is acquired according to the first induction signal. By multiplexing the device structure of the alternating gradient magnetometer, a uniform alternating magnetic field is generated in the sample seat region as an alternating magnetic field source for measuring the AC magnetic susceptibility of the sample, and the differential detection coil can be integrated into the alternating gradient magnetometer. An alternating magnetic field source and a detection system do not need to be additionally arranged, and the cost of measuring the AC magnetic susceptibility is reduced. The application further discloses a device for measuring AC magnetic susceptibility, a magnetic measurement device and a computer readable storage medium.

The utility model relates to a magnetic susceptibility instrument special-shaped object measuring and placing device which comprises a shell cylinder, a partition plate is arranged in the shell cylinder, a through hole is formed in the partition plate, a fixing piece is arranged in the shell cylinder and comprises a vertical pipe and a suction cup arranged below the vertical pipe, and the vertical pipe is arranged in the through hole; according to the utility model, the shell cylinder is placed in the measuring cavity to place a special-shaped sample, so that the sample does not need to be damaged; the fixing piece can assist in fixing the shell, and shaking or deviation is avoided.

The application discloses a magnetic susceptibility identification method for deep structure analysis of a mining area, and relates to the technical field of geological mineral exploration. The magnetic susceptibility identification method for deep structure analysis of a mining area comprises the following steps: data acquisition and preprocessing, model construction and inversion, magnetic susceptibility anomaly identification, and structure analysis and classification. According to the initial three-dimensional geological model and through the layered mixed inversion method, the magnetic susceptibility is inverted, the advantages of different inversion algorithms can be fully exerted, the shortcomings of a single algorithm can be made up, the accuracy of the magnetic susceptibility inversion result is improved, the efficient local algorithm and the strong global algorithm can be respectively used according to the geological characteristics of the shallow area and the deep area, the calculation efficiency and stability of the magnetic susceptibility inversion are improved, the set buffer area can smoothly transition and fuse the results of different magnetic susceptibility inversions, the continuous and reliable inversion result is ensured, the subsequent magnetic susceptibility anomaly identification is facilitated, and the identification effect of the magnetic susceptibility identification method is improved.

The invention discloses a magnetic susceptibility instrument for monitoring heavy metal pollution in a sand beach environment, and the magnetic susceptibility instrument comprises a host body, a support frame, an adjusting support arc foot, a direct current motor, a positioning integrated probe, a battery placement bin and a host internal component, the front surface of the host body is embedded with an LCD touch screen, and one side of the top surface is provided with a triangular mounting support plate; supporting frames are fixed to the triangular installation supporting plates, fixing clamping frames are installed at the tops of the supporting frames, detectors are clamped in the fixing clamping frames, and the three sets of supporting frames are distributed in the middles of the left side and the right side and the middle of the rear side of the main machine body. The positioning probe controls the depth to prevent sand, the drawing battery bin is sealed to prevent sand and moisture, modules in the host machine cooperate to complete magnetic susceptibility measurement, the problems of unstable supporting, sand interference and sand entering pain points of the interface and the battery bin are solved, the supporting stability and the measurement precision are improved, the storage is convenient, and the battery is convenient to maintain.

The invention relates to the technical field of magnetic material detection, and discloses an intelligent monitoring method for neodymium iron boron rare earth permanent magnet material production, which comprises the following steps of: obtaining a surface avalanche cluster projection by utilizing a magneto-optical Kerr image sequence driven by an external magnetic field through difference of adjacent field steps, and calculating an area and a shape tensor of a cluster; and constructing a power-law relationship between the cluster shape anisotropy ratio and the cluster scale so as to extract the shape anisotropy scale index of the avalanche cluster surface projection. And establishing a scale spectrum changing along with a field and forming a weighted integral index to realize lossless identification of an internal low-coercivity weak layer and a seepage channel generated by Tb / Dy grain boundary diffusion. According to the method, the limitation that Kerr microscopy can only observe the surface is broken through, quantitative inversion of the two-dimensional image on the three-dimensional magnetic domain structure is achieved, the method can be used for service state evaluation and failure early warning of the permanent magnet, and the method has high real-time performance, certainty and engineering implementability.

The invention discloses a paleo-environment reconstruction method based on geological historical records, which belongs to the technical field of paleo-geography reconstruction, and is characterized by comprising the following steps: a, obtaining a target geographic position to be subjected to paleo-environment reconstruction; b, well drilling points are marked at the target geographic position, and well drilling sampling is carried out; c, performing component analysis on the obtained gravel sample, and judging the sedimentary environment and sporopollen characteristics of the gravel sample; and d, constructing an ancient environment according to the sedimentary environment to which the gravel sample belongs and sporopollen characteristics. According to the method, the gravel in the geological layer is finely analyzed, so that the sedimentary environment of the geological layer can be more accurately judged, a more reasonable interpretation framework is provided for the magnetic susceptibility data, the magnetic susceptibility analysis accuracy is improved, and the paleoenvironment reconstruction accuracy is further improved.

A system of diagnosing internal characteristics of a device includes a magnetic shield, a solenoid positioned within the magnetic shield, and one or more sensors positioned within the magnetic shield and outside the solenoid. The device is removably positioned within the solenoid and induced magnetic fields are received by the one or more sensors.

The present invention provides a method for in vitro detection and / or quantification of an analyte in aqueous or biological fluids based on monitoring the variation of the dynamical magnetisation signal of functionalized magnetic nanoparticles after their specific interaction with an analyte. The invention also provides a method for measuring the efficacy of a treatment of a disease in a subject, a method of diagnosis of a disease in a subject, as well as an apparatus for carrying out the three methods.

A current detection device (30) is provided with a resistor (5) and a pair of electrodes (6, 7). The current detection device (30) includes a protruding portion (11). The protruding portion (11) includes a part of the resistor (5) and parts of the pair of electrodes (6, 7). The electrodes (6, 7) each has a first wall portion (66b, 67b) forming a part of the protruding portion (11), and a second wall portion (66a, 67a) forming a part of the protruding portion (11). The electrodes (6, 7) each have a detecting region (66, 67) defined by the first wall portion (66b, 67b), the second wall portion (66a, 67a), a start-end portion (66c, 67c), and a contact surface (6a, 7a). The electrodes (6, 7) each have a voltage detecting portion (20, 21) disposed in the detecting region (66, 67) with a gap from the start-end portion (66c, 67c).

The invention relates to a sensor device (3) for determining and / or monitoring a process variable of a medium (5) in a container (4), comprising - a crystal (6) having at least one defect (7), - a magnetic field system (8) for generating a magnetic field, wherein the magnetic field system (8) is arranged such that a magnetic field (B) can be generated in the region of the crystal (6) and in the region of the medium (5) located within the container (4) by means of the magnetic field system (8), and wherein the crystal (6) and the magnetic field system (8) can be arranged externally on a wall of the container (4), - a detection unit (9) for detecting a magnetic-field-dependent fluorescence signal (2) from the crystal (6), wherein the detection unit (9) has an excitation unit (10) for optically exciting the defect (7) and a detector (11) for detecting the fluorescence signal (2), and - an evaluation unit (12) for determining at least one piece of information about the process variable on the basis of the fluorescence signal (2). Furthermore, the invention relates to a method for operating the sensor device (3) of the invention.