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Title: Optically read Coriolis vibratory gyroscope based on a silicon tuning fork

Abstract

In this work, we describe the design, fabrication, and characterization of purely mechanical miniature resonating structures that exhibit gyroscopic performance comparable to that of more complex microelectromechanical systems. Compared to previous implementations of Coriolis vibratory gyroscopes, the present approach has the key advantage of using excitation and probing that do not require any on-chip electronics or electrical contacts near the resonating structure. More specifically, our design relies on differential optical readout, each channel of which is similar to the 'optical lever' readout used in atomic force microscopy. The piezoelectrically actuated stage provides highly efficient excitation of millimeter-scale tuning fork structures that were fabricated using widely available high-throughput wafer-level silicon processing. In our experiments, reproducible responses to rotational rates as low as 1.8 × 10 h–1 were demonstrated using a benchtop prototype without any additional processing of the raw signal. The noise-equivalent rate, ΩNER, derived from the Allan deviation plot, was found to be <0.5° h–1 for a time of 103 s. Despite the relatively low Q factors (<104) of the tuning fork structures operating under ambient pressure and temperature conditions, the measured performance was not limited by thermomechanical noise. In fact, the performance demonstrated in this proof-of-principle study is approximatelymore » four orders of magnitude away from the fundamental limit.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Laboratory (NREL), Golden, CO (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Wind Energy Technologies Office
OSTI Identifier:
1573199
Alternate Identifier(s):
OSTI ID: 1607153
Report Number(s):
NREL/JA-4A00-73298
Journal ID: ISSN 2055-7434
Grant/Contract Number:  
AC36-08GO28308; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Microsystems & Nanoengineering (Online)
Additional Journal Information:
Journal Name: Microsystems & Nanoengineering (Online); Journal Volume: 5; Journal Issue: 1; Journal ID: ISSN 2055-7434
Publisher:
Springer Nature
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; micro-electro-mechanical systems; Coriolis force; Coriolis vibratory gyroscope; resonator; thermal noise; optical readout

Citation Formats

Lavrik, Nickolay V., and Datskos, Panagiotis G. Optically read Coriolis vibratory gyroscope based on a silicon tuning fork. United States: N. p., 2019. Web. doi:10.1038/s41378-019-0087-9.
Lavrik, Nickolay V., & Datskos, Panagiotis G. Optically read Coriolis vibratory gyroscope based on a silicon tuning fork. United States. https://doi.org/10.1038/s41378-019-0087-9
Lavrik, Nickolay V., and Datskos, Panagiotis G. Mon . "Optically read Coriolis vibratory gyroscope based on a silicon tuning fork". United States. https://doi.org/10.1038/s41378-019-0087-9. https://www.osti.gov/servlets/purl/1573199.
@article{osti_1573199,
title = {Optically read Coriolis vibratory gyroscope based on a silicon tuning fork},
author = {Lavrik, Nickolay V. and Datskos, Panagiotis G.},
abstractNote = {In this work, we describe the design, fabrication, and characterization of purely mechanical miniature resonating structures that exhibit gyroscopic performance comparable to that of more complex microelectromechanical systems. Compared to previous implementations of Coriolis vibratory gyroscopes, the present approach has the key advantage of using excitation and probing that do not require any on-chip electronics or electrical contacts near the resonating structure. More specifically, our design relies on differential optical readout, each channel of which is similar to the 'optical lever' readout used in atomic force microscopy. The piezoelectrically actuated stage provides highly efficient excitation of millimeter-scale tuning fork structures that were fabricated using widely available high-throughput wafer-level silicon processing. In our experiments, reproducible responses to rotational rates as low as 1.8 × 103° h–1 were demonstrated using a benchtop prototype without any additional processing of the raw signal. The noise-equivalent rate, ΩNER, derived from the Allan deviation plot, was found to be <0.5° h–1 for a time of 103 s. Despite the relatively low Q factors (<104) of the tuning fork structures operating under ambient pressure and temperature conditions, the measured performance was not limited by thermomechanical noise. In fact, the performance demonstrated in this proof-of-principle study is approximately four orders of magnitude away from the fundamental limit.},
doi = {10.1038/s41378-019-0087-9},
journal = {Microsystems & Nanoengineering (Online)},
number = 1,
volume = 5,
place = {United States},
year = {Mon Oct 21 00:00:00 EDT 2019},
month = {Mon Oct 21 00:00:00 EDT 2019}
}

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