557 results about "Magnetic measurements" patented technology

Disclosed is a system and method for onboard optimal estimation of heading, pitch, and roll through real-time measurement of magnetic field, acceleration and angular motion in three dimensions. Magnetometer information is used to create an initial reference from which movement is measured. Thus, the process does not have to start when the body is in a known position. Further, the device does not have to continually rely on accelerometer data to get roll and pitch. To do this magnetic field data is used to complement gyro information. The magnetic data is used to estimate pitch, roll, and heading.

Systems and methods are provided for directional propagation-type logging measurements not sensitive to dip and anisotropy over a wide frequency range. Estimates of the distance of the logging tool to a bed boundary are obtained using “up-down” measurements with antenna configurations having tilted magnetic dipoles. These estimates are insensitive to anistropy and dip, undesirable complications of directional measurements.

High-accuracy magnetic measurement is performed by efficiently using nitrogen-vacancy pairs in all orientations. A magnetic measurement apparatus includes a diamond crystal and an image sensor. The diamond crystal has nitrogen-vacancy pairs. The image sensor detects the intensities of fluorescence generated by an exciting light applied to the diamond crystal by using a plurality of pixels. The nitrogen-vacancy pairs of the diamond crystal are made to one-to-one correspond to the pixels. The fluorescence generated by one nitrogen-vacancy pair is received by one pixel made to correspond to the nitrogen-vacancy pair.

Aspects of this invention include a downhole tool having an angular position sensor disposed to measure the relative angular position between first and second members disposed to rotate about a common axis. A plurality of magnetic field sensors are deployed about the second member and disposed to measure magnetic flux emanating from first and second magnets deployed on the first member. A controller is programmed to determine the relative angular position based on magnetic measurements made by the magnetic field sensors. In a one exemplary embodiment, a downhole steering tool includes first and second magnets circumferentially spaced on the shaft and a plurality of magnetic field sensors deployed about the housing.

A subsurface imaging cable includes a plurality of sensor modules, wherein the plurality of the sensor modules are flexible and each of the plurality of the sensor modules is spaced apart on the subsurface imaging cable at a selected distance; and a flexible medium connecting the plurality of the sensor modules, wherein the subsurface imaging cable is flexible and adapted to be wound on a reel. A method for subsurface images includes acquiring direct-current measurements at a plurality of sites in a survey area; acquiring a first set of electric and magnetic measurements from natural electromagnetic fields at the plurality of sites; acquiring a second set of electric and magnetic measurements using controlled electric and magnetic sources at the plurality of sites; and determining a subsurface conductivity distribution from the direct-current measurements and the first set and the second set of electric and magnetic measurements.

The invention discloses a high-sensitivity magnetic measurement device in an environment field based on disturbance compensation and a realization method thereof. In the method, the low-frequency disturbance compensation in an environment magnetic field is realized by a second feedback branch and a second magnetic flux locking loop, wherein the second feedback branch is composed of a second integrator, a low-pass filter, a second feedback resistor and a feedback coil; and the second magnetic flux locking loop is formed based on the second feedback branch. A super-magnetic conduction sensor established based on the method can realize the high-pass response frequency characteristics for the environment field and the low-pass response frequency characteristics for the circuit noise at the same time, ensures the suppression of the influence of environment field disturbance on SQUID (superconducting quantum interference device) magnetic measurement without influencing the weak signal measurement, and avoids the overflow phenomenon. Based on the super-magnetic conduction sensor, the method is suitable for the application environment in which the frequency of the magnetic field signal tobe measured is higher than the disturbance frequency band (DC-30Hz) of the environment field.

Measurements made using at least one two-component magnetometers on a rotating bottomhole assembly are processed to correct for disturbance of the magnetic field due to the rotating drillstring and get an estimate of instantaneous toolface angle.

A magnetic sensing assembly for measuring magnetic field produced by a time varying electric current generated in geological formations is disclosed. The assembly comprises a soft magnetic core, a sensing coil wound on the core, and at least one miniature low noise magnetic field sensor disposed near an edge of the magnetic core. Due to strong magnetic flux concentration effect of the magnetic core the sensor facilitates very low noise magnetic measurements at a low rate of change of the magnetic field, while the sensing coil offers high sensitivity and low noise measurement at higher rates. The magnetic sensing assembly preferably comprises an earth field cancellation element. The assembly also includes an acquisition means synchronized with an electromagnetic transmitter to receive and process signals from sensing coil and from magnetic field sensor.

The invention discloses a biaxial atomic spinning magnetometer. The biaxial atomic spinning magnetometer comprises an alkali metal gas chamber, non-magnetic electric heating equipment, a three-dimensional magnetic coil, a magnetic shielding layer, a pumping laser module and a detecting laser module. The alkali metal gas chamber is filled with alkali metal atoms, a quenching gas and a buffering gas; the non-magnetic electric heating equipment and the magnetic shielding layer enable the alkali metal atoms to work in a high-temperature and low-magnetic field environment, and ensure the alkali metal atoms in a non-spinning exchange relaxation state; the pumping laser module is used for polarizing the alkali metal atoms; the detecting laser module comprises two beams of independent detecting laser which are perpendicular to each other, and are used for sensing the magnetic field intensity in two directions which are perpendicular to each other simultaneously; measurement results are demodulated through a phase-locked amplifier. The biaxial atomic spinning magnetometer can acquire biaxial magnetic field information simultaneously through one alkali metal gas chamber, has the characteristics of high sensitivity, high integration degree and low cost, and has a wide application prospect in the fields of brain magnetic measurement, magnetocardiographic measurement and the like.

A method for determining properties of a mixture of fluids includes: (a) acquiring a plurality of nuclear magnetic resonance measurements from the mixture of fluids, each of the plurality of nuclear magnetic resonance measurements having a different value in an acquisition parameter for which at least one relaxation selected from the group consisting of longitudinal relaxation and transverse relaxation affects magnitudes of the nuclear magnetic resonance measurements; (b) generating a model of the mixture of fluids; (c) calculating a synthesized nuclear magnetic data set based on the model; (d) comparing the synthesized nuclear magnetic data set with the nuclear magnetic resonance measurements; and (e) adjusting the model and repeating (c) and (d), if difference between the synthesized nuclear magnetic data set and the nuclear magnetic measurements is greater than a minimum.

A method for determining a property of a flowing fluid by nuclear magnetic resonance includes applying a static magnetic field to the flowing fluid; acquiring a suite of nuclear magnetic resonance measurements on the flowing fluid using a pulse sequence comprising a spoiling pulse, a wait time, and an acquisition pulse sequence, wherein the suite of nuclear magnetic measurements have different values for the wait time; and fitting the suite of nuclear magnetic resonance measurements to a forward model for responses of the flowing fluid to derive a parameter selected from a flow speed, longitudinal relaxation times of the flowing fluid, and a combination thereof.

The invention discloses a high-altitude permafrost region porphyry type copper polymetallic mine exploration technology combination method which can improve the prospecting success rate. The method includes the following steps: A, determining a metallogenic system as a collision orogenic metallogenic system in cooperation with a collision orogenic regional geological background according to the output spatial-temporal characteristics of a permafrost region porphyry type copper molybdenum mine typical mineral deposit and numerous mineral occurrences; B, measuring stream sediments with the aim of observing geochemical halos on the upper portion of a porphyry body mineral body, defining a magnetic abnormity region through high-accuracy magnetic measurement, and defining a remote sensing predicting region with the aim of forecasting mineral resources such as copper, lead and zinc through high resolution remote sensing; C, conducting 1:1 soil profile or petrochemistry profile, groove and well exploratory exposure on explored abnormal or mineralization clues; D, defining a mineralized region or the mineral body; E, verifying the defined mineralized region or mineral body through drilling; F, determining the mineral body or the mineral deposit. By means of the method, the prospecting working period of a porphyry type copper molybdenum mineral region can be shortened, and meanwhile numerous metal mineral bodies can be explored.

This invention relates to one small magnetic space three dimensional measurement device and its method, which can solve the problem of current magnetic measurement for small magnetic measurement only for column permanent magnetic part without one complete permanent space distribution, wherein, this invention other end of first measurement arm is fixed with one first Hall sensor and the second line supply structure and third line supply structure to form first line supply structure.

The invention discloses a bidirectional magnetic saturated time difference fluxgate sensor, which is characterized in that two ends of a sensor magnetic core are wound with exciting coils, the middle section of the sensor magnetic core is wound with induction coils, output poles of the induction coils are connected with an amplifying circuit, and the amplifying circuit is connected with a counting display circuit through a band-pass filter circuit and a retardation shaping circuit. By detecting and calculating a positive negative pulse time difference value output by the fluxgate sensor in a time domain, the strength of the measured magnetic field is judged. Compared with the prior fluxgate sensor, the detection circuit is simple, the measurement stability of the system is ensured without a feedback structure, a complex subsequent circuit is not needed, the required excitation current is lower, the data processing is simple, the measured relative quantity is little, the integral volume and power consumption of the sensor are effectively reduced, and the measurement result is acquired quickly. The fluxgate sensor avoids a filter-phase-sensitive demodulation-smooth filter circuit of the prior fluxgate sensor, makes up the defect that the prior fluxgate sensor has harsh process requirement, and achieves the digitized magnetic measurement of the fluxgate sensor.

A method for determining a property of a flowing fluid by nuclear magnetic resonance includes applying a static magnetic field to the flowing fluid; acquiring a suite of nuclear magnetic resonance measurements on the flowing fluid using a pulse sequence comprising a spoiling pulse, a wait time, and an acquisition pulse sequence, wherein the suite of nuclear magnetic measurements have different values for the wait time; and fitting the suite of nuclear magnetic resonance measurements to a forward model for responses of the flowing fluid to derive a parameter selected from a flow speed, longitudinal relaxation times of the flowing fluid, and a combination thereof.

An electrode array for electric and magnetic measurements in a marine environment includes a first set of electrodes connected to a first cable, wherein the first set of electrodes and the first cable are configured to sink to a sea floor in the marine environment; a second set of electrodes connected to a second cable, wherein the second set of electrodes and the second cable are connected to the first cable and configured to float in the marine environment such that the second set of electrodes and the second cable maintain a distance from the sea floor when the first cable sits on the sea floor, and an instrument package connected to the first cable and the second cable, wherein the instrument package is configured to receive voltage signals measured by the first set of electrodes and the second set of electrodes.

The invention belongs to the technical field of magnetic measurement, and particularly relates to a movable type location method based on magnetic gradient tensor and geomagnetic vector measurement. The method comprises the following steps: (S1) setting a magnetic sensor array and an inertial navigation system; (S2) in a nonmagnetic abnormal area, acquiring a measured value of a magnetic sensor and calculating a geomagnetic vector value in a geographic coordinate system; (S3) allowing a nonmagnetic moving device to move in a magnetic target area to acquire the measured value of the magnetic sensor and an attitude angle output by the inertial navigation system; (S4) calculating a geomagnetic field component value in an array coordinate system; (S5) calculating the magnetic gradient tensor and a magnetic abnormal component in the array coordinate system; and (S6) calculating the position of a magnetic target in the array coordinate system according to the magnetic gradient tensor and the magnetic abnormal component in the array coordinate system. The method disclosed by the invention can be used for achieving movable type real-time location, overcoming the requirement for immobility of the array in static location and acquiring the projection of a magnetic field in a magnetic sensor coordinate system more accurately by attitude conversion.

The invention discloses a magnetic azimuth measuring system based on a giant magneto-resistance sensor, a measuring method and a perpendicular compensation method so as to realize omnibearing measurement of a magnetic azimuth and reduce measurement error caused by non-orthogonal and zero deviation of a three-axis sensor. The measuring system comprises an earth three-axis magnetic measurement module, a three-axis attitude measurement module, a temperature measurement module, a microprocessor and an upper computer. The invention relates to the technical field of intelligent sensor technologies,digital signal processing and the like. The invention provides an intelligent octant judgment method based on a three-axis acceleration sensor against the multi-valued problem of azimuth measurement caused by a mathematical model when the giant magneto-resistance sensor is used for performing the azimuth measurement so as to realize the omnibearing angle measurement based on the giant magneto-resistance sensor. Simultaneously, the invention provides a three-axis orthogonal and zero compensation method which is completed in the microprocessor against the measurement error caused by the three-axis non-orthogonal and zero deviation of the giant magneto-resistance sensor so as to improve the measurement precision of the measuring system. In addition, the invention further has the characteristics of low development cost, simple hardware circuit and the like.

A fluxgate micro-magnetometer with perpendicular detection and a process of realization thereof. A ferromagnetic core is perpendicular to a substrate. The axes of excitation coils and pick-up coils are also perpendicular to the substrate. A magnetic field component which is perpendicular to the substrate is thus measured. The two other components can be measured by magnetometers of classical type whose core is parallel to the substrate. Such a device may find application in the domain of magnetic measurement, as an example.

The invention discloses a transmission line malfunction positioning method based on non-contact magnetic measurement. The method is characterized by comprising step A, confirming a malfunction section; step B, identifying the type of the malfunction; and step C, internally positioning the malfunction section, wherein the malfunction section is confirmed by the following ways: constructing a remote terminal arranged on a transmission steel pylon, wherein the remote terminal consists of a microprocessor CPU (Central Processing Unit), a sensor, a signal regulating module, a data acquisition module DAQ (Data Acquisition), a storing module, a data communication module and a power supply module, wherein the sensor is used for measuring the three-dimensional component of the magnetic field at a three-dimensional space, and the data is transmitted to the DAQ module after passing through the signal regulating module. The invention provides a new transmission line malfunction positioning method based on the non-contact magnetic measurement. The malfunction section is positioned according to the magnetic data near the transmission line measured by a magneto-resistance magnetic field sensor with high sensibility, high band width and low cost.

A multi-station gravity and magnetic survey is carried out in a borehole. The data from the survey are processed to estimate the inclination and azimuth of the borehole. The drill collar relative permeability is estimated, and the estimated drill collar permeability is then used to remove the effects of induced magnetization of the drill collar on the magnetic measurements.

The invention relates to teaching equipment for quantum computation and quantum precision measurement. The teaching equipment for quantum computation and quantum precision measurement comprises a laser pulse generation module, an optical path module, a quantum sensor and a signal acquisition module. The laser pulse generation module is used for emitting laser pulse. The optical path module is arranged along an optical path of the laser pulse. The optical path module comprises a mirror bracket connected by means of a guide bar. A first collimation focusing element, the quantum sensor, a secondcollimation focusing element, a filtering element and a photodetector are sequentially arranged on the mirror bracket along the optical path. The quantum sensor is excited to generate fluorescent light by means of the laser pulse under the action of a magnetic field. The signal acquisition module is connected with the photodetector, and is used for collecting an electrical signal corresponding tothe fluorescent light. After the teaching equipment provided by the invention is adopted, students can complete a demonstration experiment of quantum algorithm and quantum precision magnetic measurement by means of manual operation, thereby mastering the basic principle of the quantum computation. The students can process the original experimental data so as to deepen the understanding of the quantum computation and the quantum precision measurement.

The method electromagnetically measures a pipe inner diameter ID and a pipe ratio of magnetic permeability to electrical conductivity μ2 / σ2 by means of a measuring arrangement 1 comprising a transmitter coil 2 and a receiver coil 3, both coils being coaxial to and longitudinally spaced from each other, the measuring arrangement 1 being adapted to be positioned into the pipe CS and displaced through the pipe. The method comprises the steps of:a1) exciting the transmitter coil 2 by means of a transmitter current Ii, the transmitter current having a first excitation frequency f1,a2) measuring a receiver voltage Vi at the receiver coil 3, a3) determining a transimpedance Vi / Ii between the transmitter coil 2 and the receiver coil 3 based on the transmitter current Ii and the receiver voltage Vi, and determining a measurement ratio Mi based on said transimpedance,b) repeating the excitation step a1), the measuring step a2), the transimpedance and the measurement ratio determination step a3) for at least a second excitation frequency f2 so as to define a measurement ratio vector [M1, M2, . . . Mn],c) calculating a prediction function vector [G1, G2, . . . Gn] based on the first and at least the second excitation frequency, a plurality of potential pipe ratio of magnetic permeability to electrical conductivity and a plurality of potential pipe inner diameter ID, andd) applying a minimizing algorithm onto the measurement ratio vector [M1, M2, . . . Mn] and the prediction function vector [G1, G2, . . . Gn] and determining the pipe inner diameter and the pipe ratio of magnetic permeability to electrical conductivity corresponding to a maximum solution of the algorithm.

In a magnetic measurement system for a battery, a magnetic signal generated by electric currents in the battery for charging and discharging can be accurately measured without saturating the output of a magnetic sensor even in an environment having strong magnetic noise, and electric current distribution in the lithium-ion battery is visualized. Generating a antiphase magnetic field having an antiphase magnetic field to a magnetic field measured by each magnetic sensor into the cancel coil disposed around each the magnetic sensor before charging and discharging; thereafter, reducing magnetic noise by subtracting the magnetic data recorded before charging and discharging (the correction-magnetic field data) from the magnetic data for charging and discharging; and accurately measuring the magnetic signal generated from the lithium-ion battery for charging and discharging are included.

Read-out electronics for DC SQUID sensor systems, the read-out electronics incorporating low Johnson noise radio-frequency flux-locked loop circuitry and digital signal processing algorithms in order to improve upon the prior art by a factor of at least ten, thereby alleviating problems caused by magnetic interference when operating DC SQUID sensor systems in magnetically unshielded environments.

Methods and related systems are described for making an electromagnetic induction survey of a formation surrounding a cased section of a borehole. An electromagnetic transmitter and / or receiver are deployed into the cased section of the borehole. One or more additional devices are used to measure the properties of a conductive casing relating to conductivity, thickness and magnetic permeability. A casing coefficient is then calculated that can then be used for the processing of the deep-sensing induction measurements.

The invention relates to an aeromagnetic measuring device and method based on a fixed-wing unmanned aerial vehicle. The aeromagnetic measuring device comprises the fixed-wing unmanned aerial vehicle, a proton magnetometer and a flight control system. A measuring holder used for installation of the proton magnetometer is fixed to the fixed-wing unmanned aerial vehicle. The proton magnetometer is used for carrying out magnetic measurement in the flying process of the fixed-wing unmanned aerial vehicle, and transmitting the magnetic measurement data to the flight control system. The flight control system is used for collecting flight data of the fixed-wing unmanned aerial vehicle, receiving the magnetic measurement data transmitted by the proton magnetometer, and sending the flight data and the magnetic measurement data to the ground in real time, so that flying control over the fixed-wing unmanned aerial vehicle is achieved on the ground according to the received flight data. The aeromagnetic measuring device and method solve the problems that manned vehicle aeromagnetic measurement is high in operation cost and personnel risk, and ground magnetic measurement is low in operation efficiency, large in environmental disturbance and the like.

A flux locked loop for providing an electrical feedback signal, the flux locked loop employing radio-frequency components and technology to extend the flux modulation frequency and tracking loop bandwidth. The flux locked loop of the present invention has particularly useful application in read-out electronics for DC SQUID magnetic measurement systems, in which case the electrical signal output by the flux locked loop represents an unknown magnetic flux applied to the DC SQUID.