Resonant Accelerometer based on Double-Ended Tuning Fork and a Force Amplification Mechanism

Proceedings

Rocha, Luis Alexandre¹  Moreira, Eurico Esteves²  Kuhlmann, Burkhard³  Gaspar, João⁴ 

[1] Author to whom correspondence should be addressed.;CMEMS-UM, University of Minho, 4800-058 Guimarães, Portugal;MeN, International and Iberian Nanotechnology Laboratory (INL), 4717-330 Braga, Portugal;Robert Bosch GmbH, 72762 Reutlingen, Germany

关键词: MEMS;    frequency modulated;    accelerometer;    DETF;   

DOI  :  10.3390/proceedings2131030

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

Resonant accelerometers are an alternative to amplitude modulated devices due to their higher integration capabilities, since they are encapsulated in vacuum and are stable at low pressures. Vacuum is required for some sensors (i.e., gyroscopes) but amplitude modulated accelerometers tend to be unstable under such conditions and therefore cannot be integrated in the same package. Herewith, a device composed by double-ended tuning fork resonators (DETF) and a force amplification mechanism for sensitivity enhancement is presented. Characterization of the fabricated devices was performed, and the design was successfully validated. A sensitivity close to 80 Hz/g was experimentally measured and the DETF characterization for different driving (AC) and bias voltages (DC) is also presented.

【 授权许可】

CC BY