A liquid rate gyroscope using electro-conjugate fluid

Kenjiro Takemura, Shinichi Yokota, Mamoru Suzuki, Kazuya Edamura, Hideo Kumagai, Tsunehiko Imamura

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


We propose a novel liquid rate gyroscope using an electro-conjugate fluid (ECF). The electro-conjugate fluid is a dielectric fluid that works as a smart fluid, generating a powerful jet flow (ECF jet) when subjected to a high DC voltage. In this study, we introduce this functional fluid into gyroscopes. Although the sensing principle for angular rate is based on that of a conventional gas rate sensor, the proposed gyroscope has a much higher sensitivity because the density of the liquid is generally higher than that of a gas. In addition, the gyroscope is small in size because the ECF jet is generated only with a pair of tiny electrodes. In other words, the pumping part of the proposed gyroscope does not need mechanical moving parts, resulting in an ECF gyroscope more suitable for micro-applications than a gas rate sensor, which requires a pumping mechanism inside. We fabricated a prototype of the liquid rate gyroscope (40 mm × 60 mm × t7 mm) and confirmed its characteristics by experiments. The experimental results confirm the effectiveness of the proposed liquid rate gyroscope. The prototype has a scale factor of -29 mV/(°/s) with an applied voltage of 4.5 kV, which is 2.2 times more sensitive than the conventional gas rate gyroscope.

Original languageEnglish
Pages (from-to)173-179
Number of pages7
JournalSensors and Actuators, A: Physical
Issue number2
Publication statusPublished - 2009 Feb 16


  • Electro-conjugate fluid
  • Functional fluid
  • Gyroscope
  • Sensor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering


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