Effect of Micro Lever Width on the Mechanical Sensitivity of a MEMS Capacitive Accelerometer

2019 ◽  
pp. 525-532
Author(s):  
Apoorva Dwivedi ◽  
Prateek Asthana ◽  
Gargi Khanna
Keyword(s):  
Mechanical Sensitivity ◽  
Capacitive Accelerometer

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 Development of a Self-Powered Piezo-Resistive Smart Insole Equipped with Low-Power BLE Connectivity for Remote Gait Monitoring

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4539
Author(s):  
Roberto de Fazio ◽  
Elisa Perrone ◽  
Ramiro Velázquez ◽  
Massimo De Vittorio ◽  
Paolo Visconti
Keyword(s):  
Low Power ◽  
Smart Materials ◽  
Applied Pressure ◽  
Pressure Sensors ◽  
Complete Characterization ◽  
Electric Signal ◽  
Sensing Matrix ◽  
Capacitive Accelerometer ◽  
Gait Parameters ◽  
Smart Insole

The evolution of low power electronics and the availability of new smart materials are opening new frontiers to develop wearable systems for medical applications, lifestyle monitoring, and performance detection. This paper presents the development and realization of a novel smart insole for monitoring the plantar pressure distribution and gait parameters; indeed, it includes a piezoresistive sensing matrix based on a Velostat layer for transducing applied pressure into an electric signal. At first, an accurate and complete characterization of Velostat-based pressure sensors is reported as a function of sizes, support material, and pressure trend. The realization and testing of a low-cost and reliable piezoresistive sensing matrix based on a sandwich structure are discussed. This last is interfaced with a low power conditioning and processing section based on an Arduino Lilypad board and an analog multiplexer for acquiring the pressure data. The insole includes a 3-axis capacitive accelerometer for detecting the gait parameters (swing time and stance phase time) featuring the walking. A Bluetooth Low Energy (BLE) 5.0 module is included for transmitting in real-time the acquired data toward a PC, tablet or smartphone, for displaying and processing them using a custom Processing® application. Moreover, the smart insole is equipped with a piezoelectric harvesting section for scavenging energy from walking. The onfield tests indicate that for a walking speed higher than 1 ms−1, the device’s power requirements (i.e., ) was fulfilled. However, more than 9 days of autonomy are guaranteed by the integrated 380-mAh Lipo battery in the total absence of energy contributions from the harvesting section.

Effects of dielectric charging on the output voltage of a capacitive accelerometer

2016 ◽  
Vol 26 (11) ◽  
pp. 115001 ◽  
Author(s):  
Hao Qu ◽  
Huijun Yu ◽  
Wu Zhou ◽  
Bei Peng ◽  
Peng Peng ◽  
...  
Keyword(s):  
Output Voltage ◽  
Dielectric Charging ◽  
Capacitive Accelerometer

scholarly journals Cystitis increases colorectal afferent sensitivity in the mouse

2009 ◽  
Vol 297 (6) ◽  
pp. G1250-G1258 ◽  
Author(s):  
Pablo Rodolfo Brumovsky ◽  
Bin Feng ◽  
Linjing Xu ◽  
Carly Jane McCarthy ◽  
G. F. Gebhart
Keyword(s):  
Urinary Bladder ◽  
Treated Group ◽  
Mechanical Sensitivity ◽  
Pelvic Nerve ◽  
Treatment Groups ◽  
Colon Inflammation ◽  
Afferent Fibers ◽  
Peripheral Mechanism ◽  
Inflammatory Soup

Studies in humans and rodents suggest that colon inflammation promotes urinary bladder hypersensitivity and, conversely, that cystitis contributes to colon hypersensitivity, events referred to as cross-organ sensitization. To investigate a potential peripheral mechanism, we examined whether cystitis alters the sensitivity of pelvic nerve colorectal afferents. Male C57BL/6 mice were treated with cyclophosphamide (CYP) or saline, and the mechanosensitive properties of single afferent fibers innervating the colorectum were studied with an in vitro preparation. In addition, mechanosensitive receptive endings were exposed to an inflammatory soup (IS) to study sensitization. Urinary bladder mechanosensitive afferents were also tested. We found that baseline responses of stretch-sensitive colorectal afferents did not differ between treatment groups. Whereas IS excited a proportion of colorectal afferents CYP treatment did not alter the magnitude of this response. However, the number of stretch-sensitive fibers excited by IS was increased relative to saline-treated mice. Responses to IS were not altered by CYP treatment, but the proportion of IS-responsive fibers was increased relative to saline-treated mice. In bladder, IS application increased responses of muscular afferents to stretch, although no differences were detected between saline- and CYP-treated mice. In contrast, their chemosensitivity to IS was decreased in the CYP-treated group. Histological examination revealed no changes in colorectum and modest edema and infiltration in the urinary bladder of CYP-treated mice. In conclusion, CYP treatment increased mechanical sensitivity of colorectal muscular afferents and increased the proportion of chemosensitive colorectal afferents. These data support a peripheral contribution to cross-organ sensitization of pelvic organs.

MOF as the rigid shell to improve the mechanical sensitivity of nitramine explosives

2021 ◽  
pp. 130940
Author(s):  
Shuang Wang ◽  
Li Yang ◽  
Jimin Han ◽  
Zhenzhan Yan
Keyword(s):  
Mechanical Sensitivity ◽  
Rigid Shell

Models of the mechanical sensitivity and growth of otoliths in fish

2003 ◽  
Vol 13 (4-6) ◽  
pp. 189-203
Author(s):  
Alexander V. Kondrachuk
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Oscillator Model ◽  
Distributed Model ◽  
Mechanical Sensitivity ◽  
Otolith Growth ◽  
Altered Gravity ◽  
Gel Layer ◽  
Longitudinal Size ◽  
Spatially Distributed

It has been suggested that, in the fish, the change of otolith mass during development under altered gravity conditions [1,2,3,4,5,6,24,25,36,37] and the growth of otoliths in normal conditions [22,23,26], are determined by feedback between otolith dynamics and the processes that regulate otolith growth. The hypothesis originates from an oscillator model of the otolith [30] in which otolith mass is one of the parameters. However, the validity of this hypothesis is not obvious and has not been experimentally verified. We tested this hypothesis by comparing the oscillator model with a simplified spatially distributed model of the otolith. It was shown that in the case of a spatially distributed fixation of the otolith plate (otoconial layer) to the macular surface, the mechanical sensitivity of the otolith does not depend on the total otolith mass nor on its longitudinal size. It is determined by otolith thickness, the Young's modulus and viscosity of gel layer of the growing otolith. These parameters may change in order to maintain otolith sensitivity under conditions (such as growth or altered gravity) that change the dynamics of otolith movement.

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