An SOI-MEMS tuning fork gyroscope with linearly coupled drive mechanism


Azgın K., Temiz Y., Akın T.

20th IEEE International Conference on Micro Electro Mechanical Systems (MEMS 2007), Kobe, Japan, 21 - 25 January 2007, pp.482-485 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • City: Kobe
  • Country: Japan
  • Page Numbers: pp.482-485

Abstract

This paper presents a new tuning fork gyroscope structure with a highly linear coupling mechanism that keeps the phases of the drive mode oscillating masses exactly opposite with the help of a symmetrically anchored ring-shaped spring. This structure eliminates the risk of drive mode instability due to any lower frequency structural modes and provides very linear drive mode oscillations together with very low g-sensitivity. The gyroscope is fabricated with the SOI-MUMPS process of MEMSCAP. The fabricated gyroscope has bias instability and angle random walk of 200 deg/hr and 5.47 deg/root hr, respectively, according to Allan Variance curve. The g-sensitivy and scale factor are measured as 9.3 (deg/hr)/g and 12mV/(deg/sec) with an R(2) nonlinearity of 0.05%.