Resumo

VELASQUEZ, A. A; BAENA RODRIGUEZ, Juliana  e  GUTIERREZ LOAIZA, Yhefferson Fernando. Design and Construction of an Embedded Digital Teslameter for the Magnetic Characterization of Materials. ing.cienc. [online]. 2015, vol.11, n.21, pp.99-113. ISSN 1794-9165.  https://doi.org/10.17230/ingciencia.11.21.5.

We present the design, construction and validation of an embedded digital teslameter, intended for use in experiments of magnetic materials characterization by inductive and static methods. The teslameter consists of a planar type Hall effect transducer THS119, with differential output and adjustable measuring range, an INA129P instrumentation amplifier with adjustable gain, a microcontroller PIC16F873A with ADC converter of 10-bits for digital processing, data storage and data transfer to the computer via serial port; and a liquid crystal display to visualize the measurements. The system is adaptable to magnetic field transducers with single or differential output and with different measuring ranges; is sensitive to changes in the intensity and the polarity of the applied magnetic field and has an effective sensitivity of 5.0 mV/mT and uncertainty of 0.5−3T for the THS119 Hall effect transducer. The prototype teslameter was compared with a commercial teslameter PHYWE 13610.90.

Palavras-chave : teslameter; Hall effect transducer; embedded system.

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