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Method for measuring magnetic field using magnetoelectric sensor

An electromagnetic sensor and sensor technology, which is used in the fields of magnetic field measurement, magnetic field size/direction, and magnetic performance measurement using electromagnetic devices

Inactive Publication Date: 2013-12-18
UNIVERSITY OF KIEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] However, this bias magnetic field is not without problems in practical applications

Method used

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  • Method for measuring magnetic field using magnetoelectric sensor
  • Method for measuring magnetic field using magnetoelectric sensor
  • Method for measuring magnetic field using magnetoelectric sensor

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Embodiment Construction

[0045] The area used for this embodiment is 20×2mm 2 The ME sensor in the form of a strip structure, the ME sensor is fixedly clamped on one end of the strip. The lowermost layer of the sensor is made of a 130 μm thick silicon support on which there is a 300 nm thick molybdenum film. The overlying layer is made of 1800nm ​​thick piezoelectric aluminum nitride. There is a 1750 nm thick magnetostrictive layer made of metallic glass (FeCoSiB) thereon. The ME voltage is tapped between the molybdenum layer and the magnetostrictive layer and measured by means of a lock-in amplifier or a spectrum analyzer. The modulation field is generated by means of an air coil surrounding the sensor and the measurement signal is generated by means of a pair of Helmholtz coils.

[0046] The magnetostrictive characteristic curve λ(H) of the example sensor is qualitatively as in figure 1 extended as shown in . It can be clearly seen that the parabolic change curve in the absence of a magnetic fi...

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Abstract

The invention relates to a method for measuring a time-variant magnetic field using a magnetoelectric sensor having mechanical resonant frequency fR, wherein the magnetic field comprises at least one component having harmonic time dependence with the measuring signal amplitude Hmess0 to be determined and the measuring signal frequency fmess to be determined in a known frequency interval fmin< fmess< fmax, and is characterised by the following steps: a. superimposing the magnetic field with a modulation magnetic field having harmonic time dependence with the known modulation amplitude Hmess0 and a selectable modulation frequency on the sensor; b. varying (wobbling) the modulation frequency over a complementary frequency interval determined by the known interval limits fmin,fmax and the resonant frequency of the sensor; c. measuring the sensor signal for each selected modulation frequency; d. searching for the at least one modulation frequency fmod, which results in a sensor signal in the mechanical resonance of the sensor; e. calculating the measuring signal frequency fmess from the previously determined modulation frequency fmod and from the resonant frequency of the sensor fR; f. transmitting the sensor signal at the modulation frequency fmod into the superimposed magnetic field amplitude Hsup; and g. calculating the measuring signal amplitude Hmess0 from the superimposed magnetic field Hsup and the modulation amplitude Hmod0.

Description

technical field [0001] The invention relates to a method for measuring a time-varying magnetic field by means of an electromagnetic sensor. Background technique [0002] Electromagnetic (ME) sensors are suitable for detecting other time-varying magnetic fields e.g. induced by electric currents in biological organisms. Electromagnetic sensors are suitable as promising candidates for replacing so-called SQUIDS (Superconducting Quantum Interference Devices), which are based on superconductors and require continuous and extreme cooling for this purpose. Furthermore, ME sensors are the subject of current research in the development of biomagnetic interfaces that can firstly be used in medical diagnostics (e.g. MEG, MKG) and possibly in the future also in prosthetic control or even in computers and machines common "mind control". [0003] The basic idea of ​​the function of all ME sensors lies in the mechanical coupling of magnetostrictive and piezoelectric materials. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/06G01R33/18
CPCG01R33/06G01R33/18G01R33/02
Inventor R·扬斯R·克内歇尔E·匡特
Owner UNIVERSITY OF KIEL
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