scholarly journals Multi-Mode Love-Wave SAW Magnetic-Field Sensors

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3421
Author(s):  
Julius Schmalz ◽  
Anne Kittmann ◽  
Phillip Durdaut ◽  
Benjamin Spetzler ◽  
Franz Faupel ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Love Wave ◽  
Quartz Substrate ◽  
Fem Simulations ◽  
Magnetic Field Sensors ◽  
One Dimensional ◽  
First Order ◽  
A Value ◽  
Field Sensor ◽  
Multi Mode

A surface-acoustic-wave (SAW) magnetic-field sensor utilizing fundamental, first- and second-order Love-wave modes is investigated. A 4.5   μ m SiO2 guiding layer on an ST-cut quartz substrate is coated with a 200 n m (Fe90Co10)78Si12B10 magnetostrictive layer in a delay-line configuration. Love-waves are excited and detected by two interdigital transducers (IDT). The delta-E effect in the magnetostrictive layer causes a phase change with applied magnetic field. A sensitivity of 1250 ° / m T is measured for the fundamental Love mode at 263 M Hz . For the first-order Love mode a value of 45 ° / m T is obtained at 352 M Hz . This result is compared to finite-element-method (FEM) simulations using one-dimensional (1D) and two-and-a-half-dimensional (2.5 D) models. The FEM simulations confirm the large drop in sensitivity as the first-order mode is close to cut-off. For multi-mode operation, we identify as a suitable geometry a guiding layer to wavelength ratio of h GL / λ ≈ 1.5 for an IDT pitch of p = 12   μ m . For this layer configuration, the first three modes are sufficiently far away from cut-off and show good sensitivity.

scholarly journals Особенности расчета и исследования вольт-эрстедной характеристики анизотропного магниторезистивного датчика

2021 ◽  
Vol 47 (10) ◽  
pp. 19
Author(s):  
В.В. Амеличев ◽  
Д.А. Жуков ◽  
С.И. Касаткин ◽  
Д.В. Костюк ◽  
О.П. Поляков ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Theoretical Calculation ◽  
Supply Voltage ◽  
Magnetization Distribution ◽  
Theoretical Studies ◽  
Magnetic Field Sensors ◽  
One Dimensional ◽  
Significant Difference ◽  
Current Value ◽  
Experimental And Theoretical Studies

The results of experimental and theoretical studies of the influence of the current value on the characteristics of anisotropic magnetoresistive magnetic field sensors based on FeNiCo alloy with a "barber-polе" structure are presented. A significant difference was found between the volt-oersted characteristics of the forward and reverse strokes with an increase in the intrinsic current caused by the input supply voltage at sufficiently high external magnetic fields. A theoretical calculation of the volt-oersted characteristic was carried out within the framework of the model of one-dimensional heterogeneity of the magnetization distribution, which coincides with the experimental curves of the forward path.

scholarly journals Magnetic Communication Using High-Sensitivity Magnetic Field Detectors

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3415 ◽  
Author(s):  
Maurice Hott ◽  
Peter A. Hoeher ◽  
Sebastian F. Reinecke
Keyword(s):  
Magnetic Field ◽  
Mobile Applications ◽  
Data Communication ◽  
High Sensitivity ◽  
Magnetic Data ◽  
Receiver Coil ◽  
Magnetic Field Sensors ◽  
Resistive Sensor ◽  
Field Sensor ◽  
Multiple Detectors

In this article, an innovative approach for magnetic data communication is presented. For this purpose, the receiver coil of a conventional magneto-inductive communication system is replaced by a high-sensitivity wideband magnetic field sensor. The results show decisive advantages offered by sensitive magnetic field sensors, including a higher communication range for small receiver units. This approach supports numerous mobile applications where receiver size is limited, possibly in conjunction with multiple detectors. Numerical results are supported by a prototype implementation employing an anisotropic magneto-resistive sensor.

Conduction electron diamagnetism in alloys and magnetic-field-dependent dielectric constant of a Fermi gas

1964 ◽  
Vol 280 (1380) ◽  
pp. 85-96 ◽  
Keyword(s):  
Magnetic Field ◽  
Dielectric Constant ◽  
Free Electrons ◽  
Impurity Potential ◽  
First Order ◽  
Dilute Alloys ◽  
A Value ◽  
Field Dependent ◽  
Self Consistency ◽  
The Magnetic Field

The diamagnetism of free electrons in the presence of charged impurity centres which are sufficiently dilute to be non-interacting is calculated to first order in the strength of the potential of the impurity centre. This is done by combining the density-matrix treatment of Landau diamagnetism with the impurity-screening theory o f March & Murray. The susceptibility involves the integrated value of the impurity potential through the crystal, and its first derivative with respect to the magnetic field, B. If the impurity potential is assumed to have a value appropriate to B — 0, then the result for the change in diamagnetic susceptibility on alloying agrees with that of Kohn & Luming (1963). It is shown, however, that the impurity potential is modified in the presence of the magnetic field, and in particular it has angular dependence. The correction to the dia­magnetic susceptibility due to this self-consistency is shown to be significant (25% ). The relevance of the theory to experimental results on dilute alloys is briefly discussed. Finally, as a by-product of the investigation, we have obtained interesting results about the form of the field-dependent dielectric constant.

scholarly journals Interface for indication and remote control of an unmanned vessel in automatic and manual modes

2021 ◽  
Vol 2061 (1) ◽  
pp. 012074
Author(s):  
Ia V Burylin
Keyword(s):  
Magnetic Field ◽  
Data Transfer ◽  
Earth’S Magnetic Field ◽  
Communication Interface ◽  
Magnetic Field Sensors ◽  
Navigation Data ◽  
Data Transfer Protocol ◽  
Automatic Guidance ◽  
Earth's Magnetic Field ◽  
Field Sensor

Abstract The article proposes a method for organizing the communication interface of an unmanned vessel and its operator. The interface contains manual controls for the course and speed of the vessel by regulating the angle of the rudder blade shift and the speed of rotation of the propeller shaft, an automatic system for keeping the vessel on a given trajectory for the purpose of navigating the vessel in automatic and manual modes. The interface comprises a system for obtaining filtration, storing the required kinematic and navigation data for identifying mathematical models of the vessel’s movement and the functioning of the autopilot. The interface allows adjusting the PID controller for automatic guidance of the vessel along the trajectory in real time to optimize automatic control, to correct the readings of the GPS and the Earth’s magnetic field sensors, to calibrate the Earth’s magnetic field sensor. The interface includes graphic and digital fields for displaying kinematic and navigation data on the vessel, autopilot and information on the operation of the operator-vessel complex. The interface allows the exchange of data between the operator and the vessel by means of a data transfer protocol via TCP-IP stack protocols on the radio frequencies of public Wi-Fi networks. The interface is created by means of appdesigner tools on the MATLAB platform.

Micro-structured optical fiber magnetic field sensor based on magnetic fluid filling

2019 ◽  
Vol 33 (31) ◽  
pp. 1950380
Author(s):  
Jie Wang ◽  
Zhen Zhang ◽  
Shuguang Li ◽  
Shun Wang
Keyword(s):  
Magnetic Field ◽  
Magnetic Fluid ◽  
High Sensitivity ◽  
Magnetic Field Sensor ◽  
The Finite Element Method ◽  
Average Sensitivity ◽  
Magnetic Field Sensors ◽  
Hole Radius ◽  
Field Sensor ◽  
Air Hole

A novel micro-structured fiber magnetic field sensor based on magnetic fluid (MF) filling is proposed. The air hole radius in the cladding of fiber is reduced from inner layer to outer layer, and the numerical analysis is performed by the finite element method (FEM). For the [Formula: see text]-pol mode, the proposed sensor has an average sensitivity of 960.61 pm/Oe, and for the [Formula: see text]-pol mode, the average sensitivity can reach 884.85 pm/Oe. The sensor has the advantages of small size and high sensitivity and is competitive in magnetic field sensors.

scholarly journals RESEARCH ON A MAGNETIC FIELD SENSOR WITH A FREQUENCY OUTPUT SIGNAL BASED ON A TUNNEL-RESONANCE DIODE

2020 ◽  
Vol 10 (4) ◽  
pp. 51-56
Author(s):  
Alexander Osadchuk ◽  
Vladimir Osadchuk ◽  
Iaroslav Osadchuk
Keyword(s):  
Magnetic Field ◽  
Equivalent Circuit ◽  
Output Signal ◽  
Differential Resistance ◽  
Operating Conditions ◽  
Magnetic Field Sensor ◽  
Magnetic Field Sensors ◽  
Operating Modes ◽  
Frequency Output ◽  
Field Sensor

Based on the consideration of physical processes in a tunnel-resonant diode under the action of a magnetic field, the construction of an autogenerating magnetic field sensor with a frequency output signal is proposed. The use of devices with negative differential resistance makes it possible to significantly simplify the design of magnetic field sensors in the entire RF frequency range. Depending on the operating modes of the sensor, an output signal can be obtained in the form of harmonic oscillations, as well as in the form of pulse oscillations of a special form. The study of the characteristics of the magnetic field sensor is based on the complete equivalent circuit of the tunnel-resonant diode. The equivalent circuit takes into account both the capacitive and inductive properties of the tunneling resonant diode. The inductive component exists under any operating conditions, as a result of the fact that the current flowing through the device is always lagging behind the voltage that caused it, which corresponds to the inductive response of a tunnel-resonant diode.

scholarly journals Wide Band Low Noise Love Wave Magnetic Field Sensor System

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Anne Kittmann ◽  
Phillip Durdaut ◽  
Sebastian Zabel ◽  
Jens Reermann ◽  
Julius Schmalz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Love Wave ◽  
Wide Band ◽  
Low Noise ◽  
Magnetic Field Sensor ◽  
Sensor System ◽  
Field Sensor

Optical fiber magnetic field sensor based on multi-mode fiber and core-offset structure

2016 ◽  
Vol 64 (12) ◽  
pp. 1129-1133 ◽  
Author(s):  
Zhengrong Tong ◽  
Yan Wang ◽  
Weihua Zhang ◽  
Panpan Luan
Keyword(s):  
Magnetic Field ◽  
Optical Fiber ◽  
Magnetic Field Sensor ◽  
Field Sensor ◽  
Multi Mode

scholarly journals Corrections to “Enhanced Performance Love Wave Magnetic Field Sensors With Temperature Compensation” [Oct 20 11292-11301]

2021 ◽  
Vol 21 (3) ◽  
pp. 3956-3956
Author(s):  
Yang Yang ◽  
Harshad Mishra ◽  
Prince Mengue ◽  
Sami Hage-Ali ◽  
Sebastien Petit-Watelot ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Temperature Compensation ◽  
Love Wave ◽  
Magnetic Field Sensors
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