30 results about "Magnetic field imaging" patented technology

The present invention discloses a novel magnetic sensor device performing direct magnetic field imaging, comprising a probe having a conical tip portion which is configured as a sensor having two superconductors separated by a thin non-superconducting layer (such as a Josephson junction based sensor), where the non-superconducting layer is located at the apex portion of said conical tip, thereby defining electron tunneling region(s) at said apex portion. The technique of the present invention enables the sensor device to be very small and to be brought very close to the sample surface.

Circuit flaws in microelectronic circuitry present regions of high resistance in which a current distribution deviates from that of a defect-free circuit. The altered current distribution emits a correspondingly altered magnetic field in accordance with Ampere's Law. When compared with the magnetic field of a defect-free circuit, the anomaly in the magnetic field of the defective device is detected and the location of the circuit flaw may be determined therefrom. As the anomaly in the magnetic field is very small in magnitude, a sensitive magnetic microscope is utilized to obtain images of the magnetic fields of a defect-free reference device and a device-under-test. The distance between the magnetic sensor and the devices being scanned is precisely controlled to minimize influences of scanning distance on the difference in measured magnetic field strength. Comparative image analysis reveals the location of the circuit flaw. Maximal image registration through image interpolation, displacement and resampling optimizes the comparative image analysis.

The utility model relates to an experimental device for nuclear magnetic resonance edge magnetic field imaging, which relates to nuclear magnetic resonance imaging. Equipped with servo motor, voice coil motor, coarse adjustment non-magnetic lifting platform, fine adjustment non-magnetic lifting platform, nuclear magnetic resonance edge magnetic field imaging probe, sample chamber, probe coil and sample relative movement / stationary conversion pin, coarse adjustment and fine adjustment non-magnetic Lifting table grating ruler and control system; the control system is equipped with a host computer, PMAC controller, servo motor driver and voice coil motor controller. Combining the two-stage lifting high-precision mechanical structure of coarse adjustment and fine adjustment with advanced closed-loop control algorithm, it can realize the high-precision movement of the sample with the highest precision of 1 μm, and complete the high-precision and high-resolution nuclear magnetic resonance edge magnetic field imaging. Two experimental methods, namely, the relative moving imaging between the probe coil and the sample and the relatively static imaging between the probe coil and the sample, can be realized without any secondary modification on an experimental device, which ensures that the strong magnetic environment is not affected to the greatest extent; the closed-loop control makes the sample The more precise the displacement, the more accurate the result.

The invention discloses a lithium battery pack consistency detection method and device based on in-situ magnetic field imaging. The method includes: during the constant current discharge process of the lithium battery pack to be tested, measuring the external magnetic field distribution of the lithium battery pack at equal discharge capacity intervals; calculating the relative change of the external magnetic field distribution of the lithium battery pack within the equal capacity interval; using a statistical analysis method to extract Statistical eigenvectors of relative magnetic field changes; Statistical learning methods are used to analyze the aforementioned statistical eigenvectors, and based on the analysis results, battery pack consistency detection and evaluation and abnormal performance battery location are realized. The device includes motion scanning equipment, magnetic field acquisition equipment, control equipment, battery testing equipment and sample equipment. The method has the advantages of non-destructive, non-contact, high efficiency, etc., and solves the problem of online monitoring of all single cells in the battery pack under the service state of the existing lithium battery pack consistency detection method. Security assessment and other scenarios provide technical support.

The invention relates to a multi-dimensional nuclear magnetic resonance edge magnetic field imaging experimental device, which relates to nuclear magnetic resonance imaging. Equipped with upper computer, PMAC controller, spectrometer, AC servo motor driver, four DC servo motor drivers, AC servo motor, four DC servo motors, edge magnetic field imaging plane lifting platform, imaging probe, two sample chambers Y-axis movement System power transmission lines, five sample chamber rotary motion system power transmission lines, seven sample chamber up and down motion system power transmission lines, four sample chamber X-axis motion system power transmission lines, probe coils, sample chamber up and down motion system worm. It can realize arbitrary angle adjustment of the sample cavity, stable mechanical discontinuous rotation and relative movement between the sample cavity and the probe coil. Through the combination of positioning algorithm and precision mechanical structure, the movement of the sample cavity relative to the coil is realized, which solves the problem that the current international multi-dimensional edge magnetic field imaging probe experimental device cannot realize the imaging of large-scale samples under a super-strong gradient field.

The invention, which relates to the technical field of the magnetic field imaging, provides a heavy-current low-power magnetic field signal difference acquisition apparatus. On the basis of improvement of a traditional gradiometer, a secondary magnetic field can be measured easily; and the apparatus has the great research values and practical application value. According to the technical scheme, the apparatus is formed by an excitation unit clamped between two receiving units; and the excitation unit is a low-power heavy-current LC oscillating circuit and is formed by parallel connection of inductive capacitors. The apparatus is mainly applied to the design and manufacturing of magnetic field imaging equipment.

The invention discloses a chip-level diamond NV-color center magnetic imaging device and method, and the method achieves the hyperfine magnetic field imaging of the two-dimensional surface of an object, such as a magnetic image of a biological cell. The method comprises the steps: carrying out the polarization of a laser pulse and a microwave pulse; generating fluorescent light generated at the NV-color center of a diamond in an external magnetic field; employing the laser pulse to generate fluorescent light again, wherein the difference result of fluorescent light of two times can reflect the magnetic field intensity of the NV-color center, thereby achieving the conversion of magnetic field information to optical information; and employing a nano-level convex lens group and a distributed optical imaging unit to convert an optical signal into an electric signal. The invention also relates to a packaging method for enabling a whole system to be packaged in a manner of chip level, and the method comprises temperature control and electromagnetic shielding. The method is great in value in the fields of biomedical research and medical diagnosis.

The invention relates to a medical magnetic resonance imager monohedral magnet device, belonging to the technical field of medical instruments. The invention comprises a main monohedral magnet, a first gradient coil, a second gradient coil, an imaging zone and a bracket, wherein, the main monohedral magnet comprises a first main magnetic pole, a second main magnetic pole, a first adjusting magnetic pole, a second adjusting magnetic pole, a first pole surface, a second pole surface and a base. The invention has the following advantages: the main monohedral magnet forms an even lamelliform magnetic field imaging zone on the outer side of the magnet; a first monoplane gradient coil and a second monoplane gradient coil provide a gradient magnetic field with favourable degree of linearity in the imaging zone so as to realize phase encoding and frequency encoding of images; by revising the incline angle of a polar surface and adjusting magnetic pole interval, an even amelliform magnetic field can be precisely built. Compared with the traditional magnetic resonance imager magnet device, the device of the invention has the advantages of small volume, light weight and good openness, and greatly lowers the cost of the magnetic resonance imager.

The invention discloses a near-bit magnetic field imaging positioning measuring instrument and a working method, and belongs to the technical field of oil drilling measurement. The near-bit magnetic field imaging positioning measuring instrument comprises a drill bit, a near-bit magnetic field imaging positioning short section, a power drilling tool, a wireless short pass transmitting assembly, awireless short pass receiving assembly, a ground receiving device and a processing computer. A non-magnetic drill bit and a non-magnetic near-bit magnetic field imaging positioning short section are adopted to form a stable magnetic anomaly detection environment nearby the drill bit, a magnetic field acquisition sensor can perform three-dimensional detection on a three-dimensional space nearby thedrill bit during rotation, the positions of anomalous fields can be accurately measured, and range information is given; and a ground computer visually displays the anomalous fields in front of the drill bit in real time on a screen according to the measured information, the interaction position of nearby sleeves and the drill bit can further be identified, and collision early warning and suggestions on pile wrapping are made.

A microscopic electrical impedance imaging device based on diamond NV color centers, including: a magnetic field imaging module, using diamond ensemble NV as a weak magnetic field detector; a microwave radiation structure module, using an Ω-shaped radiation structure as a microwave antenna to send diamond NV color centers The microwave magnetic field is radiated; the microelectrode module uses a cross-shaped iridium-iridium oxide metal electrode with two pairs of electrode arms to inject an alternating current into the buffer solution. The present invention expands the spatial resolution of the existing magnetic resonance electrical impedance imaging, and improves the spatial resolution of the electrical impedance imaging to the micron to submicron scale, thereby realizing a microscopic electrical impedance imaging method, which is suitable for cells Conductivity imaging of biological samples.

A magnet device has main coils in a pair positioned facing each other to form a static magnetic field space in between and external magnetic flux shielding coils placed coaxially to the main coils. The external magnetic flux shielding coils have a first coil group having a small coefficient of coil coupling and a second coil group having a coefficient of coil coupling greater than that of the first coil group. The first coil group is connected in series to the second coil group. External magnetic flux entering the magnetic field imaging space formed by main coils in a pair positioned facing each other is effectively warded off.

The present application relates to an atomic magnetometer and a magnetic field imaging system. The first wavelength laser and the second wavelength laser are formed by a laser light source and a frequency doubling module. The optical power of the first-wavelength laser is adjusted through the optical attenuation module to realize the non-magnetic optical heating of the atomic gas chamber, and the attenuation is adjusted to control the temperature. The laser light of the second wavelength enters the atomic gas chamber to realize the magnetic field detection. Therefore, the atomic magnetometer does not need to couple the heating laser and the pumping laser, and can realize non-magnetic heating and atomic pumping detection, which reduces the complexity of the optical path. In the magnetic field imaging system, a laser light source is connected with multiple atomic magnetometer probes. Through the position information of multiple atomic magnetometer probes and the detected magnetic field information, the accurate positioning of the magnetic field position can be realized, so as to realize the multi-dimensional magnetic field space reconstruction.