A dual-axis single-proof-mass angular accelerometer for a vestibular prosthesis

2016 ◽  
Author(s):  
Yaesuk Jeong ◽  
Hakan Toreyin ◽  
Anosh Daruwalla ◽  
Pamela Bhatti ◽  
Farrokh Ayazi
Keyword(s):  
Proof Mass ◽  
Vestibular Prosthesis ◽  
Angular Accelerometer

A two degrees of freedom comb capacitive-type accelerometer with low cross-axis sensitivity

2019 ◽  
Vol 13 (3) ◽  
pp. 5334-5346
Author(s):  
M. N. Nguyen ◽  
L. Q. Nguyen ◽  
H. M. Chu ◽  
H. N. Vu
Keyword(s):  
Degrees Of Freedom ◽  
Proof Mass ◽  
Vibration Modes ◽  
Electrode Structure ◽  
Element Analysis ◽  
Mechanical Coupling ◽  
Fully Differential ◽  
Mode Effects ◽  
The Finite Element Analysis ◽  
Cross Axis

In this paper, we report on a SOI-based comb capacitive-type accelerometer that senses acceleration in two lateral directions. The structure of the accelerometer was designed using a proof mass connected by four folded-beam springs, which are compliant to inertial displacement causing by attached acceleration in the two lateral directions. At the same time, the folded-beam springs enabled to suppress cross-talk causing by mechanical coupling from parasitic vibration modes. The differential capacitor sense structure was employed to eliminate common mode effects. The design of gap between comb fingers was also analyzed to find an optimally sensing comb electrode structure. The design of the accelerometer was carried out using the finite element analysis. The fabrication of the device was based on SOI-micromachining. The characteristics of the accelerometer have been investigated by a fully differential capacitive bridge interface using a sub-fF switched-capacitor integrator circuit. The sensitivities of the accelerometer in the two lateral directions were determined to be 6 and 5.5 fF/g, respectively. The cross-axis sensitivities of the accelerometer were less than 5%, which shows that the accelerometer can be used for measuring precisely acceleration in the two lateral directions. The accelerometer operates linearly in the range of investigated acceleration from 0 to 4g. The proposed accelerometer is expected for low-g applications.

scholarly journals Design and optimization of differential capacitive micro accelerometer for vibration measurement

2021 ◽  
Vol 30 (1) ◽  
pp. 19-27
Author(s):  
Kumar Gomathi ◽  
Arunachalam Balaji ◽  
Thangaraj Mrunalini
Keyword(s):  
Software Design ◽  
Proof Mass ◽  
Vibration Measurement ◽  
Design Parameters ◽  
Mechanical Sensitivity ◽  
Design And Optimization ◽  
Capacitive Accelerometer ◽  
Cross Axis ◽  
Micro Accelerometer

Abstract This paper deals with the design and optimization of a differential capacitive micro accelerometer for better displacement since other types of micro accelerometer lags in sensitivity and linearity. To overcome this problem, a capacitive area-changed technique is adopted to improve the sensitivity even in a wide acceleration range (0–100 g). The linearity is improved by designing a U-folded suspension. The movable mass of the accelerometer is designed with many fingers connected in parallel and suspended over the stationary electrodes. This arrangement gives the differential comb-type capacitive accelerometer. The area changed capacitive accelerometer is designed using Intellisuite 8.6 Software. Design parameters such as spring width and radius, length, and width of the proof mass are optimized using Minitab 17 software. Mechanical sensitivity of 0.3506 μm/g and Electrical sensitivity of 4.706 μF/g are achieved. The highest displacement of 7.899 μm is obtained with a cross-axis sensitivity of 0.47%.

scholarly journals A Low-g MEMS Accelerometer with High Sensitivity, Low Nonlinearity and Large Dynamic Range Based on Mode-Localization of 3-DoF Weakly Coupled Resonators

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 310
Author(s):  
Muhammad Mubasher Saleem ◽  
Shayaan Saghir ◽  
Syed Ali Raza Bukhari ◽  
Amir Hamza ◽  
Rana Iqtidar Shakoor ◽  
...  
Keyword(s):  
Microelectromechanical Systems ◽  
Dynamic Range ◽  
Proof Mass ◽  
Amplitude Ratio ◽  
Silicon On Insulator ◽  
Coupled Resonators ◽  
Mode Localization ◽  
Mems Accelerometer ◽  
Weakly Coupled ◽  
Input Acceleration

This paper presents a new design of microelectromechanical systems (MEMS) based low-g accelerometer utilizing mode-localization effect in the three degree-of-freedom (3-DoF) weakly coupled MEMS resonators. Two sets of the 3-DoF mechanically coupled resonators are used on either side of the single proof mass and difference in the amplitude ratio of two resonator sets is considered as an output metric for the input acceleration measurement. The proof mass is electrostatically coupled to the perturbation resonators and for the sensitivity and input dynamic range tuning of MEMS accelerometer, electrostatic electrodes are used with each resonator in two sets of 3-DoF coupled resonators. The MEMS accelerometer is designed considering the foundry process constraints of silicon-on-insulator multi-user MEMS processes (SOIMUMPs). The performance of the MEMS accelerometer is analyzed through finite-element-method (FEM) based simulations. The sensitivity of the MEMS accelerometer in terms of amplitude ratio difference is obtained as 10.61/g for an input acceleration range of ±2 g with thermomechanical noise based resolution of 0.22 and nonlinearity less than 0.5%.

Quadratic tuning of proof-mass actuators

1992 ◽  
Vol 6 (5) ◽  
pp. 447-459
Author(s):  
David C. Zimmerman ◽  
Ali Maddahian
Keyword(s):  
Proof Mass

A Novel Wireless Thermal Convection Type Angular Accelerometer Integrated with an Active RFID-Tag

2013 ◽  
Vol 284-287 ◽  
pp. 2005-2008 ◽  
Author(s):  
Jium Ming Lin ◽  
Kuo Hsiung Cho ◽  
Cheng Hung Lin ◽  
Hung Han Lu
Keyword(s):  
Thermal Convection ◽  
Response Times ◽  
Flexible Substrate ◽  
Wireless Sensor ◽  
Rfid Tag ◽  
Active Rfid ◽  
Angular Accelerometer ◽  
Innovative Idea ◽  
Carbon Dioxide Co2 ◽  
Oxidation Effect

Five novel ideas are proposed in this paper to integrate an active RFID tag with thermal convection angular accelerometer on a flexible substrate, thus the device is a wireless sensor. The first innovative idea is that this device is without any movable parts, so it is very reliable. The second new idea is that it is made on a flexible substrate, such as plastic or polyimide, thus it can save more power. The third new idea is that the xenon gas is applied in the chamber to conduct the heat instead of the traditional Carbon dioxide. CO2 can produce oxidation effect to the heater and thermal sensors, while the xenon not. The fourth new idea is to apply a hemi-spherical chamber; it is more streamline in nature with less drag effect to ease the fluid flow and yield quicker response. The fifth new idea and the most powerful one is that the angular accelerometer is integrated with an active RFID tag on the same flexible substrate, thus the device becomes a more useful wireless sensor. Note the linearity, sensitivity, and response times of step-input angular accelerations are better for the hemi-spherical chamber filled with Xe gas. The sensitivity is 71.4°C/(rad/s2) and the response time is 60μs.

scholarly journals Development of a Multichannel Vestibular Prosthesis Prototype by Modification of a Commercially Available Cochlear Implant

2013 ◽  
Vol 21 (5) ◽  
pp. 830-839 ◽  
Author(s):  
Nicolas S. Valentin ◽  
Kristin N. Hageman ◽  
Chenkai Dai ◽  
Charles C. Della Santina ◽  
Gene Y. Fridman
Keyword(s):  
Cochlear Implant ◽  
Vestibular Prosthesis

scholarly journals High Sensitivity Torsion Balance Tests for LISA Proof Mass Modeling

2006 ◽  
Author(s):  
S. Schlamminger ◽  
C. A. Hagedorn ◽  
M. G. Famulare ◽  
S. E. Pollack ◽  
J. H. Gundlach
Keyword(s):  
Proof Mass ◽  
High Sensitivity ◽  
Torsion Balance ◽  
Balance Tests
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