scholarly journals Circuit Design of Surface Acoustic Wave Based Micro Force Sensor

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Yuanyuan Li ◽  
Wenke Lu ◽  
Changchun Zhu ◽  
Qinghong Liu ◽  
Haoxin Zhang ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Circuit Design ◽  
Force Measurement ◽  
Pressure Sensors ◽  
Force Sensor ◽  
Piezoresistive Sensor ◽  
Detection Circuit ◽  
Micro Force Sensor ◽  
The Stability

Pressure sensors are commonly used in industrial production and mechanical system. However, resistance strain, piezoresistive sensor, and ceramic capacitive pressure sensors possess limitations, especially in micro force measurement. A surface acoustic wave (SAW) based micro force sensor is designed in this paper, which is based on the theories of wavelet transform, SAW detection, and pierce oscillator circuits. Using lithium niobate as the basal material, a mathematical model is established to analyze the frequency, and a peripheral circuit is designed to measure the micro force. The SAW based micro force sensor is tested to show the reasonable design of detection circuit and the stability of frequency and amplitude.

Finite element analysis of surface acoustic wave based on a micro force sensor

Measurement ◽  
2015 ◽  
Vol 65 ◽  
pp. 112-119 ◽  
Author(s):  
Yuanyuan Li ◽  
Wenke Lu ◽  
Changchun Zhu ◽  
Qinghong Liu ◽  
Haoxin Zhang ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Force Sensor ◽  
Element Analysis ◽  
Micro Force Sensor

scholarly journals Micro-force measurement with pre-curvature long-period fiber grating-based sensor

2020 ◽  
Vol 238 ◽  
pp. 12009
Author(s):  
Walter S. J. Ferreira ◽  
Paulo S. S. dos Santos ◽  
Paulo Caldas ◽  
Pedro A. S. Jorge ◽  
João M. S. Sakamoto
Keyword(s):  
Optical Fiber ◽  
Spectral Resolution ◽  
Force Measurement ◽  
Force Sensor ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Force Sensitivity ◽  
Period Fiber Grating ◽  
Micro Force Sensor

In this work, a long-period fiber grating (LPG) based sensor was evaluated as a sensing device for micro-force measurement, in the order of micro Newtons. It was used an LPG fabricated by arc-inducted technique in a SMF-28 standard optical fiber. The optical fiber was fixed between two clamps with a separation of 150 mm with the middle of the LPG located at the center. Characterizations were performed in terms of temperature, curvature and strain. The grating was then used as a micro-force sensor by means of both curvature and strain, induced by a hung mass in a stretched fiber. Furthermore, the evaluation of a precurvature LPG was performed to assess if an increase of sensitivity is achieved. Micro-force sensitivity achieved with the stretched LPG was 1.41 nm/mN and it was demonstrated that its sensitivity can be enhanced to 5.14 nm/mN with a pre-curvature of 2.2 m–1 applied to the LPG, achieving a spectral resolution of at least 15.6 μN.

A Low-Power Ultra-Light Small and Medium Size Acoustic Wave Touch Screen

2014 ◽  
Vol 513-517 ◽  
pp. 4072-4075 ◽  
Author(s):  
Xiong Hao ◽  
Huang Kui
Keyword(s):  
Acoustic Wave ◽  
Power Consumption ◽  
Low Power ◽  
Surface Acoustic Wave ◽  
Touch Screen ◽  
System Structure ◽  
Medium Size ◽  
Detection Circuit ◽  
High Power Consumption ◽  
Active Detection

Traditional surface acoustic wave touch screen causes high power consumption. The controller that needs to generate driving sound transducer voltage leads to large volume and high cost. It is difficult to become integration of the controller and small and medium size portable information terminal. So a low-power, ultra-light, small and medium size surface acoustic wave touch screen technology solution is proposed. On the touch screen set passive manned sensors and active detection circuit at the same time, the state transition of active detection circuit triggered by passive manned sensors, realize a touch of low power consumption, high precision requirements. In this paper the principal and system structure are discussed and the superiority is given.

Dynamic Response Analysis of Passive Wireless Surface Acoustic Wave (SAW) Strain Sensors Used for Force Measurement in Turning

2013 ◽  
Vol 7 (4) ◽  
pp. 451-460 ◽  
Author(s):  
Rory Stoney ◽  
◽  
Dermot Geraghty ◽  
Garret E. O’Donnell
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
High Performance ◽  
Force Measurement ◽  
Direct Analysis ◽  
Strain Sensors ◽  
Response Analysis ◽  
Bench Mark ◽  
Strain Sensing ◽  
Sensing Applications

Passive wireless surface acoustic wave (SAW) strain sensors offer significant advantages over alternative well known sensing technologies and can enable sensing applications robustly in very harsh environments. The passive wireless operation of SAW sensors is especially relevant given there is a drive for more robust and diverse sensing technologies in more complex and high performance applications. Wireless passive dynamic SAW strain sensing has been realised and has enabled force measurement during CNC turning. This paper demonstrates the SAW performance alongside two state of the art Kistler sensing technologies designed for this application area. Direct analysis and investigation of both static and dynamic signals is important for establishing bench-mark performancemetrics and the operational bandwidth of the SAW system.

Analysis of surface acoustic wave pressure sensors

2005 ◽  
Vol 118 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Q JIANG ◽  
X YANG ◽  
H ZHOU ◽  
J YANG
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Pressure Sensors ◽  
Wave Pressure

Surface Acoustic Wave Devices: Materials Stability in Harsh Environments

2012 ◽  
Vol 1519 ◽  
Author(s):  
Denny Richter ◽  
Michal Schulz ◽  
Sergey Sakharov ◽  
Zachary J. Davis ◽  
Holger Fritze
Keyword(s):  
High Temperature ◽  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Harsh Environments ◽  
Platinum Electrodes ◽  
Saw Devices ◽  
Passivation Layers ◽  
Acoustic Wave Devices ◽  
Gallium Content ◽  
The Stability

ABSTRACTThe availability of high-temperature stable surface acoustic wave (SAW) devices would enable realization of wireless sensors for monitoring high-temperature processes. One of the most promising substrate materials for SAW based high-temperature sensors is langasite (LGS, La3Ga5SiO14). It can be excited piezoelectrically up to its melting point at 1470 °C. However, gallium evaporation and degradation of the electrodes limit the application of LGS in SAW sensors for harsh environments to some extent.The objectives of this work include the investigation of the gallium loss in the vicinity of the langasite surface in oxidizing, reducing and vacuum conditions at temperatures up to 900 °C. The gallium content in the vicinity of the LGS surface is not decreased after annealing the samples in air, while a significant gallium loss occurs in vacuum and reducing atmospheres (0.5 % H2/Ar). The latter results in a gallium oxide deficient region of 1.5 μm below the surface after annealing for 12 hours at 900 °C. The gallium loss is virtually completely suppressed after protecting the surface with a thin alumina film.Further, thin-film electrodes based on platinum and platinum/rhodium are tested. While conventional platinum based electrodes are completely destroyed at 900 °C within hours due to agglomeration, alumina protected electrodes can be operated at least for several days at this temperature. After 400 hours at 700 °C, the alumina protected platinum electrodes show insignificant degradation. The influence of alumina passivation layers on the stability of the SAW devices is examined. Different electrode configurations are tested with respect to their long-term frequency stability at 650 °C.

scholarly journals Performance Evaluation of Capacitive Based Force Sensor for Electroencephalography Head Caps

2020 ◽  
Vol 2 ◽  
pp. 4-8
Author(s):  
Warsito I.F. ◽  
Hunold A. ◽  
Haueisen J. ◽  
Supriyanto E.
Keyword(s):  
Performance Evaluation ◽  
Force Measurement ◽  
Force Sensor ◽  
Signal Measurement ◽  
Repeatability Error ◽  
The Stability

Accurate electrode signal measurement using EEG head caps can only be achieved through sufficient contact or force. A flexible force sensor is required to obtain accurate force measurement underneath EEG head caps. In this study, we evaluate the performance of a capacitive based sensor including its accuracy, repeatability, hysteresis, and stability. The result shows that accuracy error and repeatability error were 3.03±2.8 % and 3.84±2.92 %, respectively. The stability errors were 2.37±0.15 %(10 gram), 2.54±0.00 % (50 gram), 2.37±0.15 % (100 gram), 5.07±1.16 % (150 gram), 7.27±0.39 % (200 gram). The hysteresis error of the sensor was 4.48±0.47 %. Based on the results, the capacitive based force sensor provides sufficiently low errors in accuracy, repeatability, stability, and hysteresis and is thus suitable for measuring adduction force in EEG cap applications

Sign in / Sign up

Export Citation Format

Share Document