Effect of Magnetostriction on the Core Loss, Noise, and Vibration of Fluxgate Sensor Composed of Amorphous Materials
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This paper presents a new multistructure fluxgate magnetic sensor composed of Metglas ® Fe-based amorphous HB1 material. The core thickness of the fabricated structure is 0.0254 mm × 30 pieces, and its width is 5 mm. The magnetic loss of the fluxgate core is simulated through finite element analysis. The fluxgate sensor is experimentally analyzed over a frequency range 0.5-3 kHz. The sensor performance exploits the advantages of the multistructure core-shaped magnetic material as well as the second-harmonic operation mechanism. Excellent flux responses are detected for the triangular core sensor, which has different operating frequencies for magnetostriction variation, harmonic response, total harmonic distortion, noise level, sensor vibration, and sensitivity. The influence of magnetostriction, magnetic loss, and permeability in multiangled cores for different frequencies is analyzed. Our multistructure fluxgate sensor is suitable for various applications including power transformer and inverter for interior magnetic core fault detection, owing to its thin-film configuration, high sensitivity, high resolution, and low magnetic loss.Keywords:
Fluxgate compass
Metglas
For the field of weak magnetic anomaly measurement, a high precision three axis fluxgate magnetometer MAG-XYZ is designed, which has a wide dynamic measurement range (0~ + 100000nT), high measurement accuracy (24-bit analog-to-digital converter) and 2K Hz sampling rate. The basic working principle of FGM3D / 100 sensor is described, and the composition of the three axis fluxgate magnetometer is introduced in detail. Aiming at the three-channel scale factor and zero deviation of the magnetometer acquisition unit, a multi-channel inconsistency correction of the magnetron acquisition system with least squares method is proposed. And compared with the GSM-19T proton magnetometer, the RMS error of the three axis fluxgate magnetometer is reduced from 1.506 to less than 0.157. It is shown that the method can effectively reduce the error, and improve the accuracy of the three-component magnetometer.
Fluxgate compass
GSM
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Fluxgate magnetometer possess many good features such as its light weight,small size,low power con-sumption,wide temperature range(—70℃C～180℃),high sensitivity and high stability etc.It can search in any di-rection with continuous measure readings,and especially suit for the detecting in the zero magnetic field and weakmagnetic field.Therefore,the fluxgate magnetometer is widely used in many areas such as measurement of interplan-etary magnetic field,magnetic prospecting,magnetic observation of the earth etc.The classical sensor and three ter-minal sensors are briefly described in this paper.
Fluxgate compass
Prospecting
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A scientific instrument which measures the magnetic field strength and its direction is known as Magnetometer. In this article a three axis Fluxgate Magnetometer is constructed by using simple ring core and simple drive circuits instead of specialized components like Hall Effect sensors. This type of Fluxgate magnetometers is working on the principle of magnetic flux linking a coil depends on the orientation of the coil with respect to the earth’s magnetic field lines. Here the three single axis fluxgate magnetometers are designed and placed perpendicular to each other on a board. The circuit is designed to produce 100 KHz frequency and to measure the Magnetic field in the range up to 7 Tesla. The sensitivity is tested through an external electromagnet. The readings are obtained in LAB-VIEW platform and the three-axis data is displayed.
Fluxgate compass
Electromagnet
Search coil
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Abstract The application area of fluxgate sensors is limited by their sensitivity. Medical researches create high demand on the magnetometers with the characteristics of high accuracy and sensibility for measuring weak magnetic fields produced by the human body, such as the heart‘s magnetic field. Due to the insufficient sensitivity of fluxgate sensors, superconducting magnetometers (SQUID) take the dominant position for the cardiomagnetic measurements. They have to be cooled by liquefied gases and it leads to high service costs. Therefore an idea of creating a high sensitive sensor based on fluxgate principles and known methods of measurement is attractive and up to date. This paper is dedicated to the modified flux-gate sensors based on Racetrack technology with a new approach of signal demodulation. The improved fluxgate sensor system provides detection of the heart‘s magnetic field without additional expenditures for use.
Fluxgate compass
SIGNAL (programming language)
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The measurement of the magnetic moment of rock samples with a fluxgate magnetometer is discussed. A sample-fluxgate-configuration is proposed for which the influence of inhomogeneities of the sample and geometric inaccuracies is a minimum. Special attention is paid to samples of cubical shape.
Fluxgate compass
Sample (material)
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A wide variety of sensors are currently available and used to measure magnetic fields. Fluxgate magnetometers and gradiometers measure the direction and magnitude of magnetic fields. Fluxgates are affordable, rugged, compact and very low-power making them ideal for a variety of sensing applications. Fluxgate magnetometer sensors are manufactured in severl geometries and recently have made significant improvements in noise performance, crossfield tolerance and power utilization.
Fluxgate compass
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This paper presents a new multistructure fluxgate magnetic sensor composed of Metglas ® Fe-based amorphous HB1 material. The core thickness of the fabricated structure is 0.0254 mm × 30 pieces, and its width is 5 mm. The magnetic loss of the fluxgate core is simulated through finite element analysis. The fluxgate sensor is experimentally analyzed over a frequency range 0.5-3 kHz. The sensor performance exploits the advantages of the multistructure core-shaped magnetic material as well as the second-harmonic operation mechanism. Excellent flux responses are detected for the triangular core sensor, which has different operating frequencies for magnetostriction variation, harmonic response, total harmonic distortion, noise level, sensor vibration, and sensitivity. The influence of magnetostriction, magnetic loss, and permeability in multiangled cores for different frequencies is analyzed. Our multistructure fluxgate sensor is suitable for various applications including power transformer and inverter for interior magnetic core fault detection, owing to its thin-film configuration, high sensitivity, high resolution, and low magnetic loss.
Fluxgate compass
Metglas
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Aeromagnetic exploration is one of the most important exploration methods in geophysics. In aeromagnetic exploration, three-axis fluxgate magnetometers are widely used to measure the attitude of the platform. However, system error caused by the manufacture precision of three-axis fluxgate magnetometers degrades the measurement accuracy of the attitude. Therefore, the calibration of three-axis fluxgate magnetometers is essential. In this paper, the calibration model of three-axis fluxgate magnetometers is discussed, and the measurement errors of three-axis fluxgate magnetometers in an unmanned helicopter experiment are analyzed. A calibration method is applied to the inflight data. Then, more accurate attitude of the platform is obtained. The validity of the method is demonstrated by the experimental results.
Fluxgate compass
Aeromagnetic survey
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A comprehensive investigation of magnetostriction optimization in Metglas 2605SA1 ribbons is performed to enhance magnetoelectric performance. We explore a range of annealing conditions to relieve remnant stress and align the magnetic domains in the Metglas, while minimizing unwanted crystallization. The magnetostriction coefficient, magnetoelectric coefficient, and magnetic domain alignment are correlated to optimize magnetoelectric performance. We report on direct magnetostriction observed by in-plane Doppler vibrometer and domain imagining using scanning electron microscopy with polarization analysis for a range of annealing conditions. We find that annealing in an oxygen-free environment at 400 for 30 min yields an optimal magnetoelectric coefficient, magnetostriction and magnetostriction coefficient. The optimized ribbons had a magnetostriction of 50.6 ± 0.2 and magnetoelectric coefficient of 79.3 ± 1.5 µm m−1 mT−1. The optimized Metglas 2605SA1 ribbons and PZT-5A (d31 mode) sensor achieves a magnetic noise floor of approximately 600 pT at 100 Hz and a magnetoelectric coefficient of 6.1 ± 0.03 MV m−1 T−1.
Metglas
Magnetoelectric effect
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Magnetic field measurements in orbit and on planetary surfaces using a digital fluxgate magnetometer
The first model of a three component fluxgate magnetometer based on a near sensor digitization of the fluxgate signals (digital fluxgate magnetometer) will be presented. High flexibility as well as low power and weight requirements are the main arguments to qualify the digital magnetometer for planetary missions. Tests have shown that the low noise level and long term stability of the reduced electronics and the described algorithm are good enough, so that only the sensor noise and stability limits the accuracy of the magnetometer.
Fluxgate compass
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Citations (3)