ANGLE TRANSDUCER WITH FREQUENCY OUTPUT BASED ON MAGNETOSTRICTIVE AMORPHOUS WIRES |
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| Cristian Fosalau, Mihai Cretu, Marinel Temneanu |
- Abstract:
- Amorphous wires are relatively new materials exhibiting outstanding features that make them very suitable to be employed in sensors construction. In iron-rich magnetostrictive amorphous wires (MAW) several interesting effects occur, among which Matteucci effect is of particular relevance. This effect consists in generation of sharp pulses between the ends of a straight MAW when it is concomitantly subject to an axial alternative magnetic field and to a torsion strain. The pulses amplitude depends, among other factors, on the torsion angle. In the paper, the construction of such a sensor is presented, along with a method of signal conditioning designed to converting the peak amplitude of the sensor output pulses into frequency information. The conditioning section uses a loop that controls the magnetic field intensity through the current feeding a coil, considering as control parameter the pulses amplitude. The transducer performances were assessed in comparison with a circular encoder taken as reference. The experimental tests revealed good performances to the transducer, despite its low cost. An analysis of several external influence factors upon the transducer operation and characteristics is performed.
- Keywords:
- amorphous wire, angle transducer
- Download:
- IMEKO-TC4-2002-199.pdf
- DOI:
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