84 results about "Magnetometer" patented technology

This invention discloses a method and system for detecting the angle between a tractor and trailer based on a dual-antenna combined inertial navigation system, applicable to vehicle systems. The method includes: acquiring the position difference vector between the main and auxiliary antennas using a dual-antenna GNSS system on the tractor; calculating the first coarse heading angle of the tractor; and then fusing IMU data and filtering it to obtain a high-precision first heading angle. The roll and pitch angles are calculated using accelerometer data from the trailer's IMU, and tilt compensation is performed on the magnetometer data to obtain the second heading angle of the trailer. Furthermore, the heading and lane curvature data from the tractor can be combined to dynamically compensate and correct the trailer's heading online. The difference between the first and second heading angles is calculated in real time to obtain the angle between them. This invention can maintain heading output using IMU and wheel speed data even when GNSS signals fail, and ensure trailer heading accuracy through dynamic compensation, thereby achieving stable and high-precision tractor-trailer angle measurement.

The present application relates to the technical field of oil drilling downhole testing instrument, and particularly relates to a small-size geological parameter measuring short circuit. The small-size geological parameter measuring short circuit comprises a position gamma skeleton and a gamma sensor. The device is provided with a plurality of circular-arc-shaped slots as installation bins on the outer wall of the skeleton for installing the gamma sensor, the position gamma sensor, the main control board, the power board and the magnetometer. The compact design realizes comprehensive measurement of various geological parameters and reduces the overall size. The outer wall of the skeleton is designed with a wear-resistant ring to improve the durability of the device. The shielding layer realizes partition control of the gamma rays to improve the measurement accuracy. The outer wall of the main control board, the power board and the magnetometer is covered with high-temperature-resistant soft rubber to ensure stable performance in extreme environments. The small-size geological parameter measuring short circuit can be hung near the drill bit to realize real-time edge detection, help identify and locate sandstone layers, improve the sandstone drilling rate and discover the deviation of the drilling trajectory in time.

A user-borne device includes a housing and a magnetic object coupled to the housing. The magnetic object has a magnetization direction and the magnetic object is configured to create a magnetic field associated with the magnetization direction. The magnetization direction is oriented with respect to the magnetic object such that a rotation of the magnetic object about a first rotation axis, a second rotation axis and a third rotation axis, which are orthogonal with respect to each other, is detectable based on magnetic field measurements with a plurality of magnetometers. The user-borne device is configured to control at least one trigger event based on a rotation of the magnetic object about the first rotation axis, the second rotation axis and / or the third rotation axis.

The application relates to a well-ground bidirectional communication method and device based on mixed dipole cooperation, which comprises an uplink communication device configured to encode and modulate collected downhole data by using a downhole transmitting device, transmit a modulated first time-varying electromagnetic field signal to the ground medium, simultaneously receive the first time-varying electromagnetic field signal by using a first magnetometer, and decode the received first time-varying electromagnetic field signal to realize downhole data uploading communication; and a downlink communication device configured to encode and modulate a control instruction to be transmitted downward by using a ground transmitting device, transmit a modulated second time-varying electromagnetic field signal to the ground medium, simultaneously receive the second time-varying electromagnetic field signal by using a second magnetometer, and decode the received second time-varying electromagnetic field signal to realize control instruction downward transmission communication. The application can be widely applied to the fields of oil and gas well engineering, while-drilling measurement and control and downhole communication.

The intelligent positioning and tracking device comprises a cap body, a three-axis magnetometer is fixedly connected to the front end of the left side of the cap body, a positioner is fixedly connected to the rear end of the left side of the cap body, and a three-axis accelerometer is fixedly connected to the front end of the right side of the cap body. And the rear end of the right side of the cap body is fixedly connected with a three-axis gyroscope. A worker wears the helmet body on the head, the first binding belt and the second binding belt can be firmly connected under the cooperation of the nylon velvet belt and the nylon hook belt, the three-axis accelerometer, the three-axis magnetometer, the three-axis gyroscope and the positioner are arranged, the position information of the worker can be positioned in real time, and the working efficiency is improved. A methane sensor, a carbon monoxide sensor, an oxygen concentration sensor, a temperature and humidity sensor, a dust concentration sensor and a microseismic monitoring sensor are arranged, and the methane concentration, the carbon monoxide concentration, the oxygen concentration, the temperature and humidity information, the dust concentration and the vibration condition in the environment can be detected respectively.

A remote field eddy current, RFEC, system for detecting an azimuth location of a defect in a pipe includes a holder extending along a longitudinal axis X and shaped to flow through the pipe, a magnetic field generator located within the holder and configured to generate a first magnetic field B0, a 3-axis fluxgate magnetometer located within the holder, at a given distance away from the transmitter, along the longitudinal axis X, wherein the fluxgate magnetometer is configured to measure a second magnetic field B, which is a result of the first magnetic field B0 interacting with the defect in the pipe, and a controller located within the holder and configured to receive a value of the second magnetic field B and to determine an azimuth of the defect in the pipe by interpreting radial components of the measured field, and an extent of the defect based on the second magnetic field B.

The present application relates to the technical field of biomedical sensing, and discloses a tumor microenvironment multi-parameter monitoring method, device, medium and equipment, the method comprising applying an excitation magnetic field to a magnetic nano-probe in a target region, using a photomagnetic probe array to collect a nonlinear magnetization response signal; performing harmonic decomposition and feature extraction on the nonlinear magnetization response signal to obtain a harmonic feature vector for characterizing the nonlinear magnetization response; inputting the harmonic feature vector into a physical constraint inversion engine to solve, simultaneously decouple and output quantitative estimation values of at least two tumor microenvironment parameters of the target region, the at least two tumor microenvironment parameters being any two or more of a pH value, an oxygen partial pressure, a local temperature and a magnetic nano-probe concentration; the physical constraint inversion engine is constructed based on a Bayesian inference framework fused with a physical constraint regularization term. The above method realizes simultaneous, high-precision, in-situ decoupling and monitoring of multiple parameters in a tumor microenvironment.

The application discloses an automatic speed measurement method based on a TPMS with a magnetometer and a tire pressure detection system. Single-axis magnetic field intensity located on a tire surface is sampled according to a preset sampling interval. A plurality of continuous peak points are obtained according to a sampling value and based on the same sampling interval. A tire rotation period is obtained based on the number of sampling points between the plurality of continuous peak points and the sampling interval, so as to calculate the speed of a current vehicle. The automatic speed measurement method can detect a motion state at different speeds, effectively avoids the problems of an accelerometer range and precision, has a lower cost than the accelerometer, and has a higher stability than the accelerometer.

The application discloses a kind of three-dimensional magnetic field coil magnetic axis orthogonality measurement methods under geomagnetic field environment, belong to magnetometry technical field.The method does not need to construct zero magnetic environment, only utilizes scalar magnetometer and unipolar current source, through the measurement geomagnetic field scalar, single-axis different current under the synthetic magnetic field, the synthetic magnetic field of double-axis simultaneous energization, combine spatial vector mathematical model and equation set elimination method, eliminate the unknown angle interference of geomagnetic field and coil magnetic field, sequentially solve single-axis magnetic field intensity, three-axis magnetic axis angle, finally obtain magnetic axis orthogonality.The application measurement equipment is less, easy to operate, time-consuming is short, uncertainty is small, measurement precision is high, can be widely applied in magnetometry, aerospace, biological medical fields such as three-dimensional magnetic field coil orthogonality verification, calibration and test.

This invention provides a highly stable magnetometer array mounting structure for underwater magnetic field target detection, relating to the field of underwater detection technology. It includes an underwater platform carrier mounting base, which is connected to a middle frame via a connector. A magnetic shielding plate is provided on the connector between the connector and the middle frame. The middle frame includes a frame body, with mounting holes on both short sides. These mounting holes are connected to slide rails via bolts. This invention, through its designed connector, reduces the efficiency of vibration transmission between the underwater platform carrier and the frame body, thereby improving the overall structure's impact resistance and adaptability. This ensures the magnetometer probe remains stable in dynamic underwater environments, reducing measurement errors caused by mechanical vibration. Simultaneously, the magnetic shielding plate effectively isolates stray magnetic fields generated by the platform carrier, enhancing detection accuracy and reliability.

A handheld magnetometer and a magnetic field fusion correction method integrating software correction and temperature monitoring, which is composed of a probe module, an excitation conditioning module and a data acquisition module, the probe module is connected with the excitation conditioning module through electrical signals; the excitation conditioning module is connected with the data acquisition module through electrical signals; the probe module converts invisible magnetic signals into measurable electrical signals and outputs them to the excitation conditioning module; the excitation conditioning module detects, extracts and amplifies the weak signals output by the probe module and outputs them to the data acquisition module; the data acquisition module interacts with external devices after AD conversion. Through high integration, many problems that need to be solved by users are perfectly solved in the sensor, and stable, reliable and easy-to-use digital data is directly output.

This application discloses an autonomous navigation and deception defense system and method for unmanned aerial vehicles (UAVs) in GPS-denied environments. The system includes a multi-source sensor array, and parallel deception detection and isolation threads and a tightly coupled multi-source fusion navigation thread. The deception detection and isolation thread performs multi-dimensional consistency checks on received navigation data. When a dual comparison of geomagnetic fingerprints indicates a poor match between GPS position and geomagnetic readings, but a good match between visual position and geomagnetic readings, the GPS data is isolated from the fusion module. The tightly coupled fusion navigation module employs an error state Kalman filter with an IMU as its core. A geomagnetic deviation term is introduced into the state vector, and the original observation geometric information is directly fed into the filter for tight coupling. The difference between the geomagnetic vector obtained from a geomagnetic vector map query and the measured value from the magnetometer is used for fusion and updating, achieving high-precision continuous navigation in GPS-denied environments.

This invention relates to a multi-chamber atomic lamp for an optically pumped magnetometer, comprising a middle cup ring, an upper cover, a lower cover, capillary tubes, and a support base. The upper cover is fixed to the top of the middle cup ring, and the lower cover is fixed to the bottom of the middle cup ring. Capillary tubes are densely arranged inside the middle cup ring, and the space inside the capillary tubes is a capillary chamber filled with an alkaline metal mixed gas. Each capillary chamber is independently set, and the outer surface of the capillary tube is coated with ultraviolet light-emitting adhesive. The support base is coaxially connected to the bottom surface of the lower cover. This application has the effect of improving the reliability of atomic lamp luminescence.

A computer system receives a plurality of signals corresponding to first time-series magnetic data generated from a plurality of unshielded magnetometers proximate to the human subject. The first time-series magnetic data corresponds to magnetic fields generated from the human subject. The plurality of signals includes contributions from a biomagnetic field from at least a portion of the subject's organ and a background magnetic field. The computer system synchronizes the first time-series magnetic data to a common clock to generate synchronized time-series magnetic data. The computer system applies one or more filters to the synchronized time-series magnetic data to obtain filtered data. The computer system applies one or more noise reduction techniques to the filtered data to generate updated time-series magnetic data.

The utility model belongs to the field of measuring tool, specifically disclose a kind of for the measurement device of coaxiality of gearbox output shaft and butt joint shaft, including gearbox, ratchet gear, chain, transmission device and magnetometer, the gearbox be rectangular, and the left end surface of gearbox is equipped with input shaft;The ratchet gear includes connecting sleeve and big ratchet wheel;The connecting sleeve is sleeved on input shaft;Big ratchet wheel is installed on the outer wall of connecting sleeve by keying;Big ratchet wheel is connected with the transmission device of gearbox upper end face by chain;The right end surface of the gearbox is equipped with output shaft, and the right side of output shaft is equipped with alignment shaft;The magnetometer is installed on the outer wall of output shaft, and the measuring head of magnetometer is in contact with the outer wall of alignment shaft;The device structure is simple, and it is convenient to install, and it is convenient to adjust;It can greatly improve work efficiency, and can effectively reduce labor intensity, reduce labor cost.

This invention provides a novel integrated attitude sensor for satellites, relating to the fields of onboard attitude control and electronics. It includes: a star sensor body; a solar sensor body mounted on the star sensor body; a magnetometer body within the star sensor body; and a gyroscope body within the star sensor body. By integrating traditional discrete structures into a single device, the size and weight are reduced, and costs are significantly lowered. Magnetometer and gyroscope data are fused in real-time within an FPGA. This device features rapid adaptability, modular design supporting plug-and-play functionality, and integrated design improving EMC performance. It solves the problems of existing traditional satellite attitude control systems, where various attitude sensors are independently configured and equipped with dedicated processors, resulting in high hardware redundancy, large overall size and weight, high power consumption and cost, hindering further improvements in attitude measurement accuracy and dynamic performance, and leading to high overall design complexity.

The invention relates to a method for calibrating a magnetometer using a magnetic field source arranged at a distance from the magnetometer in a predetermined pose, comprising the following steps: receiving a measurement signal from the magnetometer while the magnetic field source generates a predetermined reference magnetic field, Calculating a ground-truth measurement signal that would correspond to a magnetometer measurement signal if the magnetometer alone measured the reference magnetic field, based on the predetermined pose and the predetermined reference magnetic field. Calibrating the magnetometer based on the measurement signal and the ground truth measurement signal. The invention relates to a device, a system for calibrating a magnetometer, a computer program and a machine-readable storage medium.

This invention relates to an attitude calculation method for an unmanned aerial vehicle (UAV) attitude reference system, belonging to the field of UAV navigation. In this invention, the collected sensor data is first filtered to obtain an initial unit quaternion from the navigation coordinate system to the vehicle coordinate system. The accelerometer output is normalized and an error vector is constructed with the normalized gravity vector. The vehicle motion mode is determined by the accelerometer and gyroscope outputs, and the gain coefficient is adaptively adjusted to calculate the gyroscope error correction, thus completing the attitude update and correcting the horizontal attitude. Simultaneously, the magnetometer output is evaluated; if the magnetometer output is valid, the heading angle is corrected, and the corrected three-axis attitude angles are output in real time. This invention uses only quaternions for calculation, avoiding the calculation of rotation matrices and improving calculation efficiency. Compared to traditional complementary filtering algorithms, it incorporates vehicle motion mode judgment and adaptive complementary filter parameter adjustment, avoiding erroneous attitude corrections by the accelerometer under high dynamic conditions. By applying a second-order complementary filter to process accelerometer and magnetometer data for attitude compensation, horizontal attitude correction can be avoided when magnetometer data is unavailable, achieving decoupling of attitude correction.

The present application relates to a kind of electrorheological cutters, electrorheological cutter setting device and electrorheological cutter setting method, electrorheological cutter includes the non-metal shaft being arranged along Z axis, electrode disc being arranged at the bottom of the non-metal shaft, electrode being arranged at the bottom of the electrode disc two ends along the non-metal shaft symmetry and there is interval, first magnet being arranged at the bottom of the electrode, and electrode barrier sheet being arranged between the gap of two electrode, the length of the electrode barrier sheet along Z axis is not more than the length of the electrode along Z axis.Electrorheological cutter setting device includes electrorheological cutter and polishing liquid storage tank, second magnet, magnetometer and stop sheet.Electrorheological cutter setting method is: by adjusting the interval of first magnet and second magnet, according to the magnetic field intensity between them, determine the polishing gap required between silicon wafer and electrode.Compared with prior art, the present application can effectively prevent the discharge phenomenon generated between electrode, and then improve electrorheological polishing stability.

This invention relates to the field of ultrasensitive magnetic measurement technology based on quantum sensing, and in particular to a single-beam zero-magnetic-field dual-axis vector magnetometer and its usage and applications. This invention employs a single probe laser beam to simultaneously perform pumping and detection functions, and innovatively combines the tensor-vector polar moment conversion (AOC) effect, magnetic field modulation, and large-amplitude modulation of the optical frequency. This significantly reduces the resonant linewidth of the magnetometer while suppressing photon shot noise and detector electronic noise, and achieves dual-axis magnetic field measurement in a zero-magnetic environment. In laboratory desktop experiments, a sensitivity of level 10 can be achieved.

The utility model relates to the technical field of electromagnetic method detection, and disclose magnetometer hanger of electromagnetic method detection, including fixed outer pole, still including air pump shell and adjusting assembly, the inside of fixed outer pole is provided with telescopic inner pole, the outside fixed connection of telescopic inner pole has fixed mounting seat, the inside fixed connection of fixed mounting seat has balanced tail wing, balanced tail wing sets up the outside of telescopic inner pole, the back of fixed outer pole is provided with counterweight box, adjusting assembly sets up the front of telescopic inner pole, the outside fixed connection of fixed outer pole has air pump shell, the inside of air pump shell is provided with air pump body. Through setting up the air pressure push rod in the inside of fixed outer pole sliding of air pump body that generates air pressure of air pump shell, limit its through the sliding indicating rod that sets up when the fixed outer pole slides, make the device can carry out effective length adjustment, guarantee the stability of detection equipment and the accuracy of detection result, strengthen the flexibility and applicability of detection equipment.

This invention relates to a method for detecting and locating buried targets based on a pod optimization algorithm, comprising the following steps: acquiring data synchronously collected by two optically pumped magnetometers and performing differential processing to obtain a magnetic anomaly fingerprint curve; extracting key time-frequency domain features from the magnetic anomaly fingerprint curve and obtaining a gradient field based on the magnetic anomaly fingerprint curve; and detecting and locating the buried target based on the key time-frequency domain features and the gradient field using a parameter inversion model based on the pod optimization algorithm. By performing high-precision, high-resolution detection and analysis of the weak magnetic field anomalies caused by buried targets, the target can be effectively detected and quickly identified. This invention utilizes the anomalous signals caused by the magnetic differences between the target and its surrounding environment, combined with advanced signal processing and parameter inversion algorithms, to achieve accurate judgment of the target's location and properties. This technology is not only efficient and fast but also has non-contact, long-distance detection capabilities, which can significantly reduce the dangers faced by workers.

This invention discloses a method and system for underground vehicle speed measurement based on robust waveform matching. The method includes the following steps: constructing multiple magnetometer baseline pairs, extracting the magnetic field waveform sequences of the front and rear magnetometers for each baseline pair; dividing the magnetic field waveform sequences into multiple sliding windows along the time axis, and determining a target sliding window containing the time to be measured; within the target sliding window, performing waveform matching using a robust dynamic time warping algorithm based on the magnetic field waveform sequence corresponding to each magnetometer baseline pair, and calculating the local vehicle speed estimate and its corresponding matching weight for each magnetometer baseline pair based on the matching results; and weighted fusing the local vehicle speed estimates of each magnetometer baseline pair based on the matching weights to obtain the target vehicle speed estimate. This method improves the ability of magnetic field waveforms to stably match in underground engineering environments, achieving accurate measurement of underground vehicle speeds.

1. The name of the design product: magnetometer case. 2. The use of the design product: as a magnetometer case for environmental magnetic field measurement, with functions of magnetic field display, storage, and data communication with host computer, etc. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

An optically pumped magnetometer module includes a housing and a cell unit disposed in the housing. The cell unit has a cell enclosing an alkali metal, a heat conductive member covering the cell, and a heater provided to the heat conductive member. The cell includes a main body portion having a light-passing region through which at least one of pump light and probe light passes. The heat conductive member is continuously provided over an entire region of an outer surface of the main body portion excluding the light-passing region.

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.

This invention relates to a three-dimensional adjustable support device for a sensor based on an optically pumped magnetometer and its measurement method. Aimed at solving the problems of poor sensor fit and adaptability in existing magnetocardiography (MCC) detection systems, it provides a scalable, adjustable, and precise three-dimensional positioning solution. The support panel adopts a modular design and includes a three-dimensional positioning system that can adapt to the anterior chest curve of subjects of different body types, from adolescents to adults. The optically pumped magnetometer is installed in an independently adjustable insert that can slide along the normal direction within the support frame and is precisely locked by a self-locking mechanism. This design ensures the stability and repeatability of sensor positioning and minimizes mechanical errors, thereby ensuring the acquisition of high-quality magnetocardiographic signals.

The application discloses a bicycle power mechanism rotation detection method, an electronic device, an electronic system and a computer readable storage medium. The method comprises the following steps: acquiring acceleration of the power mechanism collected by an accelerometer, and / or acquiring a direction angle of the power mechanism collected by a magnetometer; and determining a first rotation number of the power mechanism based on the acceleration and / or the direction angle. The method can determine the rotation number of the power mechanism by using the acceleration collected by the accelerometer and / or the direction angle collected by the magnetometer, and does not need to detect the rotation number by recording the number of times that a magnet rotates through the position of a sensor by using a Hall effect or a magnetic induction effect. Therefore, the method not only has high anti-magnetic interference capability, but also reduces the influence of road bumps on collected data, thereby improving the accuracy of detection of a pedal frequency.