Geometry dependence of temperature coefficient of resonant frequency in highly sensitive resonant thermal sensors

Research output: Contribution to journalArticle

Abstract

In this paper, the geometry dependence of the temperature coefficient of resonant frequency (TCRF) is investigated and compared with a theoretical thermal stress change using Si mechanical microresonators. The used resonators have Y, T, I (conventional double-supported type) and arrow shapes, and in each shape the resonant frequency change of the resonator is measured in relation to changes in the amount of heat input to the resonator. The change trend in the experimental resonant frequency and the theoretical thermal stress in changing the temperature are consist. The TCRF in each resonator is Y: %653, T: %162, I: %417, and the arrow is 174 ppm/K. These absolute values are much higher than those of conventional cantilevered Si resonators (%34.9 ppm/K). In addition, the frequency fluctuations based on Allan deviation are experimentally evaluated considering the theoretical thermal fluctuation noise. It is considered that use of this technique to improve the TCRF of resonators by changing the geometry has the possibility of creating a sensor with highly sensitive thermal detection.

Original languageEnglish
Article number087201
JournalJapanese journal of applied physics
Volume56
Issue number8
DOIs
Publication statusPublished - 2017 Aug

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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