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Nuevo dispositivo y metodología para medir campos magnéticos de corriente continua (DC)


Oferta Tecnológica
Una organización española de investigación pública, un centro alemán de investigación y una universidad eslovaca han desarrollado un proceso y aparato para medir campos magnéticos de corriente continua (DC) basados en el efecto magnetoestrictivo de cables magnéticos. La metodología permite cuantificar el campo magnético de forma sencilla y sensible. La tecnología está relacionada con sistemas microelectromecánicos (MEMS). Se buscan socios de la industria de electrónica con el fin de licenciar la patente.


New device and methodololgy to measure direct current (DC) magnetic fields
A Spanish Public Research Organization, a German Research Centre and a Slovak University have developed a procedure as well as the apparatus for the measurement of the DC magnetic field based on the magnetostrictive effect of given magnetic wires. This methodology allows the quantification of the magnetic field in a simple and sensitive way. This invention relates to microelectromechanical systems (MEMS). Industrial partners from the electronics industry are being sought for patent licensing.
Micro-electro-mechanical systems receive considerable attention due to their ability to respond very fast and their easy control of the magnetically expansive parts in range of its elastic limits during applied magnetic fields. Particularly, magnetostrictive amorphous microwires, being among the softest magnetic materials, present outstanding peculiarities due to their highly sensitive magnetoelastic behaviour. Previous studies have related the utility of those properties for several sensors applications.

Our technology includes a procedure for measuring a DC magnetic field by means of a cylindrical device formed by a magnetostrictive core coated by a Pyrex-like insulating cover. A DC magnetic field is applied and the mechanical deformation on the device caused by the magnetic field is measured and compared with the obtained measurements from previous calibrations. That way, the magnetic field intensity values are estimated.

The device includes three main elements: a cyclindrical sensor with the ability to be deformed when exposed to a DC magnetic field, a deformation sensing device and a processing unit to detect the intensity of the DC magnetic field.

The measuring system consists of two alternative configurations where the magnetostrictive sensing element can be fixed by one or both of the ends. This microwire device offers two working regimes. In the first mode, one end of wire is connected to the fixed contact, while its second end is connected to a movable or free contact. The wire expands, creating a motion on the free movable contact. In the second mode, both ends are connected to fixed contacts. Magnetostrictive forces act on the microwire resulting here in its bending. In both regimes, the DC magnetic field is calibrated through the reversible mechanical deformation of the microwire device.
Advantages and Innovations:
* The magneto mechanical device is very easy to prepare, and profits of its cylindrical shape. The procedure is quick and has one single step.
* This device is protected from ambient corrosion atmosphere and electrically thanks to the anticorrosive and insulating nature of the Pyrex glass tube.
* Fully linear and reversible behaviour is found between deformation (up to 2 micron) of the composite wire and the applied DC magnetic field (up to 6 mT).
Stage of Development:
Under development/lab tested
Patent(s) applied for but not yet granted

Partner sought

Type and Role of Partner Sought:
We are looking for partners in the microelectronics/sensors sectors, companies interested in the use and explotation of this fabrication method, under patent license.


Type and Size of Client:
R&D Institution
Already Engaged in Trans-National Cooperation:
Languages Spoken:


Technology Keywords:
01001 Electrónica, microelectrónica
01002001 Micro and Nanotechnology related to Electronics and Microelectronics
02009009 Sensores para coches y transporte
06005002 Sensores y productos inalámbricos
09001009 Tecnología de sensores relacionada con la realización de medidas