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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2010-02-15
Evaluation of a Ni-Zn Ferrite for Use in Temperature Sensors
By
Vera Lucia Othero de Brito,

    Dr. Vera Lucia Othero de Brito

    Divisão de Física Aplicada

    Institute for Advanced Studies --- Applied Physics Division

    Brazil

    Homepage

Luiz Fernando Alves De Almeida,

    Dr. Luiz Fernando Alves De Almeida

    Universidade do Vale do Paraiba

    Brazil

    Homepage

Anderson Kenji Hirata,

    Dr. Anderson Kenji Hirata

    Institute for Advanced Studies --- Applied Physics Division

    Brazil

    Homepage

Antonio Carlos da Cunha Migliano

    Dr. Antonio Carlos da Cunha Migliano

    Institute for Advanced Studies --- Applied Physics Division

    Brazil

    Homepage

Progress In Electromagnetics Research Letters, Vol. 13, 103-112, 2010
doi:10.2528/PIERL09120708 | Google Scholar

Abstract
This work investigates the variation of the real part of the complex magnetic permeability of a Ni-Zn ferrite for application to temperature sensors. Ferrite samples were fabricated by means of the conventional ceramic method. Zinc, nickel and iron oxides were used as raw materials. The samples were sintered at 1200, 1300, and 1400oC. The complex magnetic permeability of the samples was measured at temperatures ranging from -40oC to +50oC. The complex magnetic permeability of the samples was analyzed in the 100 kHz--100 MHz frequency range, and the temperature sensitivity of the magnetic permeability (μr'/T) was analyzed at 100 kHz. The magnetic permeability variation of the ferrite permits to use it as a temperature transducer with a maximum temperature sensitivity of about -119oC-1. The highest magnitudes of temperature sensitivity occurred between +30oC and +50oC. Therefore, the ferrite could be sensitive enough to allow temperature measurements at the human body temperature level. The results indicate that the temperature range of maximum temperature sensitivity of the ferrite may be adjusted by means of appropriate selection of the fabrication parameters.
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Citation
Vera Lucia Othero de Brito, Luiz Fernando Alves De Almeida, Anderson Kenji Hirata, and Antonio Carlos da Cunha Migliano, "Evaluation of a Ni-Zn Ferrite for Use in Temperature Sensors," Progress In Electromagnetics Research Letters, Vol. 13, 103-112, 2010.
doi:10.2528/PIERL09120708
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