Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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A Temperature Difference-to-Frequency Converter Using Resistance Temperature Detectors.

측온저항체온도센서를 이용한 온도차-주파수변환기

  • Chung, W.S. (Dept. of Semiconductor Eng., Chongju University.) ;
  • Kim, H.B. (Dept. of Semiconductor Eng., Chongju University.) ;
  • Lee, J.S. (Dept. of Electronics Eng., Chongju University.) ;
  • Lee, K.M. (Dept. of Electronics Eng., Chongju University.) ;
  • Kim, H.S. (Dept. of Electronics Eng., Chongju University.) ;
  • Shin, H.J. (Dept. of Electronics Eng., Chongju University.)
  • 정원섭 (청주대학교 반도체공학과) ;
  • 김홍배 (청주대학교 반도체공학과) ;
  • 이주신 (청주대학교 전자공학과) ;
  • 이근만 (청주대학교 전자공학과) ;
  • 김희석 (청주대학교 전자공학과) ;
  • 신희종 (청주대학교 전자공학과)
  • Published : 1987.07.03
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Abstract

A novel temperature difference-to-frequency converter using two resistance temperature detectors (RTDs) has been developed. The resistance difference of two RTDs is converted into its equivalent inductance to form the resonant circuit of the Colpitts oscillator. The conversion sensitivity of $16\;Hz/^{\circ}C$ and the residual nonlinearity less than 2.15% over the temperature difference range from $35^{\circ}C$ to $155^{\circ}C$ are obtained by the prototype converter. The frequency drift of oscillator itself is ${\pm}0.5\;Hz$. Thus, the minimum detectable temperature difference is estimated to be ${\pm}0.013^{\circ}C$. The proposed converter, except for two RTDs, can be fabricated in monolithic IC form.

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