61 results about "Gradiometer" patented technology

The invention discloses a stiff composite pile construction detection method based on a quantum technology and an electromagnetic geophysical prospecting method, which comprises the following steps of: constructing a peripheral cement soil pile and a core pile, and doping an electromagnetic sensitive material into a cement soil curing agent; a quantum gravity gradiometer and an electromagnetic induction instrument which are integrated on construction equipment are used for collecting gravitational field and electromagnetic field data of a construction area in real time in the whole process of cement soil stirring and core pile pressing-in; the density, the water content distribution and the uniformity of the cement soil are inversed and regulated in real time, and an unfavorable geologic body is identified; dynamically adjusting construction parameters based on cement soil properties and geological conditions obtained by inversion, and performing targeted reinforcement on a bearing stratum; the pile end stress bubble formation and the pile-soil interaction effect are verified; and based on the multi-source data acquired in the whole process, generating a digital quality file of the single pile for quality acceptance. The method can realize a construction process, namely a detection process, a single pile, namely a sensor, and a global data driving decision.

The invention discloses a mountainous area surface matrix physical property prediction method, and relates to the technical field of geological exploration, and the method comprises the steps: obtaining mountainous area surface point cloud data, separating vegetation from ground points through a point cloud classification algorithm, and generating a digital elevation model and a digital surface model; based on the digital elevation model and the digital surface model, a quantum gravity gradiometer is adopted to move along a contour line for measurement, a gravity gradient tensor is obtained, terrain interference signals are eliminated, and a vertical density profile is obtained through inversion; identifying a density abnormal region according to the vertical density profile, acquiring an undisturbed soil column sample by adopting a drilling unit, determining a grain composition and moisture characteristic curve, performing DNA extraction and microorganism sequencing on the undisturbed soil column sample, and calculating the relative abundance of the nitro spirillum phylum. According to the method, the dynamic coupling model is constructed through fusion of quantum gravity gradient measurement and microbiological omics data, and the problem of insufficient vertical density-permeability coefficient coupling modeling precision of a traditional method is solved.

The invention discloses a method for monitoring the relative gravity of surface subsidence in a coal mining process, and the method comprises the steps: arranging a quantum gravity base station at the periphery of a subsidence area, deploying a relative gravimeter in a basin according to a grid, arranging a fiber grating gravity sensing chain in an underground crossheading, and carrying a cold atom gravity gradiometer by adopting an unmanned plane for periodic scanning. A gravitational field-mass migration model is established based on real-time data, coal mining volume, rock stratum density change and earth surface gravity anomaly are associated, geological background interference is eliminated through wavelet multi-scale decomposition, and a gravity change value is optimized through hydrological correction in combination with water level and porosity. And when the corrected gravity change exceeds a threshold value, calculating a rock stratum fracture azimuth angle by using a gravity gradient tensor, inverting an equivalent mining thickness based on the gravity change, dynamically predicting a surface subsidence form in combination with a subsidence basin model, constructing a state vector in combination with gravity, gradient and deformation data, and realizing multi-source fusion prediction through a filtering algorithm.

The present application relates to a kind of rotation accelerometer gravity gradiometer attitude error post-processing compensation method, comprising the following steps: step 1, original motion data is acquired using the inertial measurement unit fixed with gravity gradient sensor, and the positioning and speed information provided by radio navigation are combined to complete original data acquisition;Step 2, the attitude error of gravity gradient sensor in the measurement process is optimally estimated;Step 3, based on the coordinate transformation matrix of gravity gradient tensor under different coordinate systems, the error compensation of gravity gradient measurement value is carried out, and finally the gravity gradient measurement data after attitude error compensation is obtained.The present application can be used in dynamic measurement environment, and the measurement information of carrier motion is measured using gyroscope and accelerometer, the attitude error of gravity gradient measurement component is estimated and compensated offline with high precision, and then the dynamic measurement precision of rotation accelerometer gravity gradiometer is improved.

A sensor, including: a gradiometer including a plurality of magnetoresistors, the gradiometer being configured to generate a sensing signal in response to a magnetic field that is at least in part produced as a result of an electrical current flowing through a conductor; and electronic circuitry configured to detect an electrical current consumption of the gradiometer, compare the electrical current consumption against at least one of a first threshold and a second threshold, and output an indication that the sensor is subject to tampering based on an outcome of the comparison.

Disclosed are methods and devices for detecting retained surgical items or other objects having a magnetic signature within a corpus of a patient. The device can comprise a handle, a shaft extending from the handle, and a distal sensing portion positioned distally of the shaft. The distal sensing portion can comprise one or more gradiometers comprising a plurality of magnetometers. The device can further comprise one or more output components configured to generate a user output to alert a user of a detected object.

The invention relates to a light reflector element having several reflector surfaces which are aligned at an angle to a predefined direction of light incidence of the light reflector element, wherein the reflector surfaces can be arranged ring-shaped around a center of the light reflector element at a uniform angular distance to each other, wherein the reflector surfaces are arranged opposite each other with respect to the center of the light reflector element, so that light incident in the direction of light incidence (L) is deflected by the reflector surfaces into light rays which run towards each other in different spatial directions and meet in a central axis which runs through the center in the direction of light incidence. The invention further relates to a reflector arrangement with at least two such reflector elements and a quantum gradiometer. In general, the invention relates to the field of atom interferometers, in particular with magneto-optical traps (MOTs). In particular, the invention relates to atom interferometric gravimeters and gradiometers formed therewith.

A method for 3D inversion of Full Tensor Gradiometry (FTG) data comprising receiving observed FTG data, performing a kernel matrix calculation on a subset of the observed FTG data and the gravity anomaly data, performing one-time forward modeling in a wavenumber domain to produce predicted FTG data and predicted gravity anomaly data for the reference density model, performing a residual between the observed data and predicted data, performing a depth-weighting function, a model covariance matrix, and data error covariance matrix on the observed FTG data and observed gravity anomaly data, obtaining a model update based on the depth-weighting function, kernel matrix, the model covariance matrix and the data error covariance matrix, and the residual between the observed FTG data and the predicted FTG data in the wavenumber domain, and performing inversion by directly obtaining an inverted model based on the model update and reference model.

The invention discloses a three-component optical fiber Sagnac gravity gradiometer and a three-component gravity gradient measurement method. The three-component optical fiber Sagnac gravity gradiometer comprises a joint resolving unit and at least two optical fiber Sagnac gravity gradiometers, the optical fiber Sagnac gravity gradiometer comprises a gravity gradiometer body and a Sagnac interferometer, and an optical fiber ring is installed on a rotor of the gravity gradiometer body and used for obtaining the angular acceleration when the rotor rotates. Rotors of the two optical fiber Sagnac gravity gradiometers are parallel to the central axis of the ground and are orthogonal, and the two optical fiber Sagnac gravity gradiometers are used for respectively generating rotary motion under the action of different components of the gravity gradient; and the resolving unit is used for resolving three gravity gradient components according to the angular accelerations acquired by the two optical fiber Sagnac gravity gradiometers. According to the invention, the three diagonal components of the gravity gradient can be measured at the same time.

The application relates to the technical field of magnetic detection, in particular to a method and a test system for coupling a magnetic gradiometer and a SQUID to improve sensitivity, which comprises the following steps: deploying at least one set of magnetic gradiometer probe arrays in a superconducting shielding environment to obtain original magnetic gradiometer tensor data streams of a target area; feeding a multi-channel SQUID front-end input coil through a superconducting transmission line; completing magnetic flux locking and amplification to generate a preliminary signal by the SQUID; suppressing environmental and SQUID background noise by using an adaptive digital noise reduction processor to obtain a high-fidelity magnetic gradiometer signal; and generating a high-resolution magnetic gradiometer distribution map through gradient reconstruction and spatial resolution enhancement. The superconducting shielding environment combines array acquisition to suppress external interference and retain complete tensor characteristics, and the superconducting transmission line combines a multi-channel SQUID to reduce transmission noise and cumulative error, so that the signal is closer to the original state, and the SQUID locking sensitivity and amplification fidelity are improved. The application improves the sensitivity of magnetic gradiometer detection and the accuracy of target identification.

The invention belongs to the technical field of precision measurement, and relates to an indoor movable base testing device for a horizontal tensor gravity gradiometer and application of the indoor movable base testing device. The device comprises a control processing module, and a gravity gradient standard field generation module and a motion simulation module which are respectively connected with the control processing module, the motion simulation module and the gravity gradient standard field generation module are both fixed on a foundation, and the gravity gradient standard field generation module comprises an electric displacement table; a pair of attraction source assemblies arranged in an orthogonal mode is fixed to the electric displacement table. The horizontal tensor gravity gradiometer to be measured is arranged on the motion simulation module and located between the pair of gravitation source assemblies; the control processing module is used for driving the motion simulation module to simulate the environment of the movable base, and is also used for enabling the gravitation source assembly to translate on the electric displacement table and generating a gravity gradient standard field dynamically matched with the motion of the gravitation source assembly. According to the invention, the performance verification of the horizontal tensor gravity gradiometer under the condition of simulating the movable base can be realized, and the test cost and period are reduced.

The embodiment of the invention discloses a data compensation method and device, equipment and a storage medium, and the method comprises the steps: building a target interference compensation model of a pod platform for a towed superconducting full-tensor magnetic gradient measurement system, the target interference compensation model comprising an SQUID magnetic gradiometer measurement item, an interference compensation item and a sensor self-interference correction item; wherein the interference compensation item excludes a residual magnetism interference item of the pod platform, and the interference compensation item comprises a magnetic induction interference item represented by a first-order derivative of an earth magnetic field component and an eddy current interference item represented by a second-order derivative of the earth magnetic field component; the self-interference correction item of the sensor is used for representing the self unbalance degree and unknown offset of the SQUID magnetic gradiometer; constructing a target function based on the target interference compensation model; inputting the measured value of the SQUID magnetic gradiometer and the measured value of the SQUID magnetometer into a target function, and solving by adopting a symmetric super-relaxation iteration method to obtain a compensation coefficient; and compensating the towed superconducting full-tensor magnetic gradient measurement system based on the compensation coefficient.

A biomagnetic sensor that incorporates an integrated active noise cancellation unit that uses a gradiometer to remove ambient magnetic noise from a detection signal obtained from a tunnelling magnetoresistive (TMR) sensor unit that is indicative of a magnetic field adjacent to biological tissue. The ambient magnetic noise can thus be removed in real time at a front end of the sensor (e.g. as part of circuitry in the sensor body itself). The active noise cancellation technique proposed herein may be effective enough to enable the biomagnetic sensor to be used in an unshielded environment (i.e. an environment that is subject to the Earth's magnetic field, for example), which widens significantly the potential uses for the sensor.

This invention discloses a method and system for geological and mineral exploration, belonging to the field of geological and mineral technology. The solution includes three core steps: First, a quantum gravity gradiometer array is constructed at the target mining site to collect quantum gravity data in each area to mark drilling target areas that meet the criteria. Second, fluid data from nanorobots tracking each drilling target area is analyzed to determine the nanorobot penetration plan and collect ore-forming fluid data. Finally, a three-dimensional fracture network model of the target mining site is constructed based on the ore-forming fluid data. By calculating the total clustering coefficient corresponding to the model, the design and analysis of the mining plan for the target mining site are completed. This solution integrates quantum technology and nanorobot tracking technology, and through data acquisition and modeling analysis, provides an innovative technical path and systematic analytical framework for the scientific formulation of geological and mineral exploration and mining plans.

A biomagnetic field sensor for detecting magnetic fields from the human body comprises: a tunnelling magnetoresistive (TMR) sensor unit 104 to measure a biological magnetic field; a gradiometer unit 1

Described herein are methods and apparatuses to provide accurate measurement of relatively small magnetic fields under ambient conditions while being worn on an ambulatory subject. These methods and apparatuses may allow accurate and reliable detection of biomagnetic fields from organs such as the brain, heart, and muscles, using a magnetometer, and in particular, using an Acoustically Driven Ferromagnetic Resonance (ADFMR) sensor. These methods and apparatuses may incorporate one or more of: a synthetic gradiometer, flexible and / or thin-film / foil shielding, and / or denoising.

A cavity cell for an optically-pumped atomic magnetometer is disclosed, wherein the cavity cell includes several distanced confining chambers containing alkali atoms and configured to receive co-propagating pump and probe light beams. At opposite ends of the confining chambers are arranged top and bottom walls including an inner structure or an optical coating on an inner face that provides a partial reflectivity for the pump and probe lights of the co-propagating pump and probe light beams, thus making the cell become an optical cavity cell. An optically-pumped atomic magnetic gradiometer including the disclosed cavity cell, and a system that includes the disclosed gradiometer and a microscopy system are also disclosed.

A method for 3D inversion of Full Tensor Gradiometry (FTG) data comprising receiving observed FTG data, performing a kernel matrix calculation on a subset of the observed FTG data and the gravity anomaly data, performing one-time forward modeling in a wavenumber domain to produce predicted FTG data and predicted gravity anomaly data for the reference density model, performing a residual between the observed data and predicted data, performing a depth-weighting function, a model covariance matrix, and data error covariance matrix on the observed FTG data and observed gravity anomaly data, obtaining a model update based on the depth-weighting function, kernel matrix, the model covariance matrix and the data error covariance matrix, and the residual between the observed FTG data and the predicted FTG data in the wavenumber domain, and performing inversion by directly obtaining an inverted model based on the model update and reference model.

The utility model discloses an auxiliary device for slope measurement of an urban and rural road model, which relates to the technical field of slope measurement and comprises a gradiometer, the bottom end of the gradiometer is movably sleeved with a protective frame, grooves are symmetrically formed in the inner wall of the bottom end of the protective frame, and the inner walls of the grooves are fixedly connected with fixed shafts. The outer sides of the fixing shafts are movably sleeved with rotating plates, and the sides, close to each other, of the rotating plates are fixedly connected with overturning plates correspondingly. The protective frame and the turnover plate are arranged, so that the measuring surface at the bottom of the gradiometer can be covered and protected through mutual matching of the protective frame and the turnover plate when the gradiometer is not used, and the measuring surface of the gradiometer can be effectively prevented from being damaged due to friction and collision in the transportation process; and a threaded rod and a rotating block are arranged, and in the using process, through mutual cooperation of the threaded rod and the rotating block, the protective frame and the connecting rod can be detached, so that replacement of the damaged protective frame is achieved.

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 application provides a device, system and method for detecting weak electromagnetic signals of a sample, comprising a driving module, N Helmholtz coils, a low-temperature container, two SQUID modules, a first signal processing module and a second signal processing module; N is a natural number greater than 1; the driving module provides driving signals for each Helmholtz coil, each SQUID module includes a SQUID galvanometer and a gradiometer; the input end of each SQUID galvanometer is connected to each gradiometer; the input end of the first signal processing module is connected to the output end of each SQUID galvanometer, and outputs a first processing signal to the second signal processing module; the second signal processing module determines whether the processing signal produces random resonance. The present application can realize synchronous detection, that is, the sample of the substance to be tested dissolved in the solvent and the sample containing pure solvent are tested synchronously at the same time, further avoiding the error caused by the time difference caused by separate testing.

The utility model discloses a slope detector for engineering, and relates to the technical field of engineering slope detection, the slope detector comprises a mounting disc and a main foot margin, the outer side of the mounting disc is uniformly and rotatably provided with a plurality of movable rods around the axis, and the inner side of the top of the mounting disc is rotatably connected with a rotating disc; the ends, away from the mounting disc, of the multiple movable rods are fixedly connected with handles. A roller moving part is mounted on the inner side of the top of the rotating disc in a rolling manner; the handle is provided with an adjusting foot margin component; a gradiometer is arranged at the top of the roller moving part, and the roller moving part comprises a T-shaped mounting frame; the two sides of the two ends of the T-shaped installation frame are rotationally connected with the two idler wheels respectively, and the two ends of the T-shaped installation frame are in threaded connection with the two fixing screw rods. Through the structure, the position of the gradiometer can be adjusted, the gradients of different positions can be conveniently and rapidly measured, and the positions where the gradients can be measured can be further increased through the rotating disc; and a plurality of movable rods can be folded, so that storage and movement are facilitated, and the measurement efficiency is improved.

The embodiment of the application discloses a data compensation method, device, equipment and storage medium, and the method comprises the steps of establishing a target interference compensation model of a towed superconducting full-tensor magnetic gradient measurement system for a pod platform, wherein the target interference compensation model comprises a SQUID magnetic gradiometer measurement item, an interference compensation item and a sensor self-interference correction item; wherein the interference compensation item excludes residual magnetic interference items of the pod platform, and the interference compensation item comprises a magnetosensitive interference item represented by a first-order derivative of an earth magnetic field component and an eddy current interference item represented by a second-order derivative of the earth magnetic field component; the sensor self-interference correction item is used for representing the imbalance degree and unknown offset of the SQUID magnetic gradiometer; a target function is constructed based on the target interference compensation model; the SQUID magnetic gradiometer measurement value and the SQUID magnetometer measurement value are input into the target function, and a compensation coefficient is obtained by using a symmetric overrelaxation iteration method; and the towed superconducting full-tensor magnetic gradient measurement system is compensated based on the compensation coefficient.

Size, weight, and cost of an atomic magnetic sensor vacuum chamber, and thus an atomic magnetometer and / or an atomic magnetic gradiometer, is reduced by using at least one photonic integrated circuit (PIC). The at least one PIC is configured to receive an optical signal, e.g., from a laser, and to distribute the optical signal to at least one set of two or more grating coupled surface emitters. Each grating coupled surface emitter is configured to collimate, direct, and emit, along a direction of emission, an optical beam, derived from a portion of the optical signal, to an optical detector.

The utility model provides a gradiometer for water conservancy and hydropower exploration. The gradiometer comprises a main body, one side of the main body is provided with a handle groove convenient to grasp, the other side of the main body is provided with a circular hole used for installing a main cylinder, a connecting frame is arranged below the main cylinder, and a magnet is embedded below the connecting frame; an arc-shaped baffle is arranged at each of the two ends of the main cylinder, a convex rod is arranged on the outer side of each arc-shaped baffle, an arc-shaped groove for embedding the convex rods is formed in the circular opening of the main body, a rolling groove is formed in the main body and located on the outer side of the arc-shaped groove, and a ball is arranged in the rolling groove. Compared with an existing gradiometer, the gradienter does not need to be gradually adjusted to be in the horizontal state by rotating the scale rotating wheel, the gradienter is always kept in the horizontal state through the arrangement of the connecting frame, the magnet and the ball, the gradienter can be rapidly stabilized after the main cylinder rotates, an operator can conveniently and rapidly complete recording of the scale value pointed by the pointer, and the working efficiency is improved. And the working efficiency and the detection speed are improved.

The utility model relates to the technical field of mine repair engineering surveying and mapping, and discloses a slope measuring device for mine repair engineering surveying and mapping, which comprises a slope measuring instrument, an anti-slip sleeve is fixedly connected above the right side of the slope measuring instrument, and a level tube is arranged in the slope measuring instrument. A dial is installed on the front face of the gradient measuring instrument, a scale rotating wheel is installed at the top of the gradient measuring instrument, a measuring range adjusting mechanism is arranged at the bottom of the gradient measuring instrument, and a convenient mechanism is arranged on the left side of the top of the gradient measuring instrument. The first extension strip and the second extension strip are convenient to move through the baffle and the handle, and the first extension strip and the second extension strip are horizontally guided through cooperation of the first guide groove, the first iron sliding block, the second guide groove and the second iron sliding block, so that the bottom plate at the bottom of the gradient measuring instrument is extended, and the gradient measuring instrument is convenient to use. And the gradient measuring range of the gradiometer placed on a slope can be increased conveniently.

To provide a buried object magnetic survey system capable of improving the quality of measurement data by suppressing false recognition of small detection as noise and discriminating clear noise.SOLUTION: The buried object magnetic search system includes a sensor parallel arrangement frame 10 suspended and towed from a search barge. The sensor parallel arrangement frame 10 has a ladder shape. A plurality of both coil type magnetic gradiometers 11 and a plurality of cesium magnetometers 12 are alternately provided corresponding to each step of a ladder. Further, the sensor parallel arrangement frame 10 is provided with a motion sensor 13.SELECTED DRAWING: Figure 2

Provided is a cell for optically-pumped atomic magnetic gradiometry that includes a first confining chamber containing alkali atoms and configured to receive a co-propagating pump and probe light beam, including pump light polarized to spin polarize the alkali atoms, and at least a second confining chamber containing alkali atoms, distanced from the first confining chamber, and which is also configured to receive a co-propagating pump and probe light beam. Also provided are an optically-pumped atomic magnetic gradiometer including the presently disclosed and a system that includes the presently disclosed gradiometer and a microscopy system.

The invention relates to a gravity gradiometer comprising at least two vehicles (V1, V2), each comprising an inertial measurement unit (UMI1, UMI2) and a control unit (COM1, COM2) for controlling the vehicles along paths having separate segments for performing inertial-measurement-unit reversals and coupled segments for exchanging inertial measurements. At least one of the electronic control units is arranged so to determine, in particular from the exchanged measurements: a transformation matrix between the inertial reference frames, a correction of the linear-acceleration measurements based on an observed accelerometric model, a correction of the angular-velocity measurements based on an observed gyrometric model, and a gradient of the gravitational field. The invention also relates to a navigation system comprising such a gravity gradiometer.

The invention discloses an external coincidence precision evaluation method and equipment for a gravity gradient vertical horizontal component, and the method comprises the steps: enabling a shipborne cold atom absolute gravimeter and a full-tensor gravity gradiometer to be installed on the same ship, controlling a measurement ship to sail at a constant speed along a preset measurement line in the north-south direction or the east-west direction, and carrying out the synchronous measurement, obtaining gravity vertical component data output by a shipborne cold atom absolute gravimeter and vertical horizontal component data output by a full-tensor gravity gradiometer; performing filtering processing on the gravity vertical component data and the vertical horizontal component data, and performing point-by-point calculation on the filtered gravity vertical component data and the corresponding position data by adopting a midpoint difference method to obtain a calculation value of a vertical horizontal component; and respectively counting the total number of effective measuring points of the measuring lines in the north-south direction and the east-west direction, and calculating the root-mean-square error of the vertical horizontal component data and the corresponding calculation value, the root-mean-square error being the external coincidence precision of the vertical horizontal component of the full-tensor gravity gradiometer.