Strain sensitivity of thin-film InSb transistor

1973 ◽  
Vol 61 (1) ◽  
pp. 129-130 ◽  
Author(s):  
F.C. Luo ◽  
M. Epstein
Keyword(s):  
Thin Film ◽  
Strain Sensitivity

Embedded Piezoresistive Thin Films for Monitoring GFRP Composites

2010 ◽  
Author(s):  
Bryan R. Loyola ◽  
Valeria La Saponara ◽  
Kenneth J. Loh
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Damage Detection ◽  
Glass Fiber ◽  
Electrical Impedance Spectroscopy ◽  
Detection Sensitivity ◽  
Strain Sensitivity ◽  
Structural Components ◽  
Fiber Reinforced ◽  
Embedded Sensing

The trend towards higher reliance on fiber-reinforced composites for structural components has led to the need to rethink current nondestructive evaluation (NDE) strategies. In principle, embeddable sensor schemes are desired for green-light/red-light structural health monitoring systems that do not negatively affect the properties and performance of the host structure. However, there are still numerous challenges that need to be overcome before these embedded sensing technologies can be realized for real-world structural systems. For example, some of these issues and challenges include the damage detection sensitivity/threshold, reliability of the system, transportability of the system to multiple configurations and different types of structural components, and signal processing/interpretation. The objective of this study is to develop a novel, embedded sensing system that can accurately quantify damage to composites without interfering with structural performance and functionality. In particular, this study will utilize multi-walled carbon nanotube (MWNT)-polyelectrolyte (PE) thin films deposited on a glass fiber substrate for in situ composite structural monitoring. A layer-by-layer (LbL) film fabrication methodology is employed for depositing piezoresistive nanocomposites directly onto glass fiber fabrics, and the resulting film exhibits excellent strain sensing performance, homogeneity, and exhibits no phase segregation. Specifically, the LbL fabrication process will employ polycationic poly(vinyl alcohol) (PVA) and polyanionic poly(sodium 4-styrene sulfonate) (PSS) doped with MWNTs for fabricating the electrically-conductive and piezoresistive thin films. Upon film deposition, the glass fiber substrates are infused with an epoxy matrix via wet-layup to fabricate self-sensing glass fiber-reinforced polymer (GFRP) composite specimens for testing. A frequency-domain approach, based on electrical impedance spectroscopy, is used to characterize the electromechanical response of the GFRP-MWNT-based thin film samples when subjected to complex uni-axial tensile load patterns. A resistor connected to a parallel resistor-capacitor circuit model is proposed for fitting experimental impedance spectroscopic measurements. It has been found that the series resistor models the bulk thin film piezoresistive performance accurately. In addition, these impedance measurements shed light on the glass fiber-thin film interaction electromechanical behavior. Bi-functional strain sensitivity is observed for all GFRP specimens, and the transition point of bilinear strain sensitivity is utilized as a possible metric for GFRP damage detection.

scholarly journals Analysis of Bulk and Thin Film Model Samples Intended for Investigating the Strain Sensitivity of Niobium-Tin

2011 ◽  
Vol 21 (3) ◽  
pp. 2550-2553 ◽  
Author(s):  
M. G. T. Mentink ◽  
A. Anders ◽  
M. M. J. Dhalle ◽  
D. R. Dietderich ◽  
A. Godeke ◽  
...  
Keyword(s):  
Thin Film ◽  
Strain Sensitivity ◽  
Film Model ◽  
Thin Film Model

Origin of mechanical strain sensitivity of pentacene thin-film transistors

2013 ◽  
Vol 14 (5) ◽  
pp. 1323-1329 ◽  
Author(s):  
V. Scenev ◽  
P. Cosseddu ◽  
A. Bonfiglio ◽  
I. Salzmann ◽  
N. Severin ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
Mechanical Strain ◽  
Strain Sensitivity

Origin of the Strain Sensitivity for an Organic Heptazole Thin-Film and Its Strain Gauge Application

2018 ◽  
Vol 72 (8) ◽  
pp. 911-914
Author(s):  
Heesun Bae ◽  
Pyo Jin Jeon ◽  
Ji Hoon Park ◽  
Kimoon Lee
Keyword(s):  
Thin Film ◽  
Strain Gauge ◽  
Strain Sensitivity

scholarly journals Design and Analysis of a Turning Dynamometer Embedded in Thin-Film Sensor

Micromachines ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 210 ◽  
Author(s):  
Yuntao Zhang ◽  
Wenge Wu ◽  
Yanwen Han ◽  
Haijun Wen ◽  
Yunping Cheng ◽  
...  
Keyword(s):  
Thin Film ◽  
Sensitivity Coefficient ◽  
Bending Test ◽  
Strain Effect ◽  
Strain Sensitivity ◽  
Measurement Sensitivity ◽  
Element Analysis ◽  
Film Sensor ◽  
K Value ◽  
Mechanism Model

This paper proposes a high-strain sensitivity turning dynamometer that combines several thin-film resistor grids into three Wheatstone full-bridge circuits that can measure triaxial cutting forces. This dynamometer can replace different cutter heads using flange connections. In order to improve the strain effect of the dynamometer, the strain film sensor is fixed on the regular octagonal connection plates on both ends of the elastomer by vacuum brazing, and the stepped groove structure is also designed inside the elastomer. The dynamometer model is simplified as a four-segment cantilever beam which has different sections. The measurement mechanism model of the dynamometer system is established by the transformation relationship between deflection and strain, under external force. The standard turning tool of 20 mm square is used as a reference. The influence of the structural dimensions of the dynamometer on its strain sensitivity coefficient K is studied. The applicability of the theoretical model of dynamometer strain is verified by finite element analysis. Finally, the dynamometer with the largest K value is subjected to the bending test and compared with a standard turning tool. The experimental results show that the measurement sensitivity of the dynamometer is 2.32 times greater than that of the standard turning tool. The results also show that this dynamometer can effectively avoid the influence of the pasting process on strain transmission, thus indicating its great potential for measuring cutting force in the future.

scholarly journals Strain sensitivity and durability in p-type and n-type organic thin-film transistors with printed silver electrodes

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Kenjiro Fukuda ◽  
Kenta Hikichi ◽  
Tomohito Sekine ◽  
Yasunori Takeda ◽  
Tsukuru Minamiki ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
Organic Thin Film Transistors ◽  
Strain Sensitivity ◽  
Organic Thin Film ◽  
Silver Electrodes ◽  
P Type

Clean Electron Microscope Substrate Films Used for Micrometeorite Collection and Study

1967 ◽  
Vol 25 ◽  
pp. 366-367
Author(s):  
D. M. Davies ◽  
R. Kemner ◽  
E. F. Fullam
Keyword(s):  
Thin Film ◽  
Electron Microscope ◽  
High Altitude ◽  
Amyl Acetate ◽  
Temperature Variations ◽  
Film Forming ◽  
Film Specimen ◽  
Particulate Contaminants

All serious electron microscopists at one time or another have been concerned with the cleanliness and freedom from artifacts of thin film specimen support substrates. This is particularly important where there are relatively few particles of a sample to be found for study, as in the case of micrometeorite collections. For the deposition of such celestial garbage through the use of balloons, rockets, and aircraft, the thin film substrates must have not only all the attributes necessary for use in the electron microscope, but also be able to withstand rather wide temperature variations at high altitude, vibration and shock inherent in the collection vehicle's operation and occasionally an unscheduled violent landing.Nitrocellulose has been selected as a film forming material that meets these requirements yet lends itself to a relatively simple clean-up procedure to remove particulate contaminants. A 1% nitrocellulose solution is prepared by dissolving “Parlodion” in redistilled amyl acetate from which all moisture has been removed.

Microtomy of spherical Al2O3 powders

1983 ◽  
Vol 41 ◽  
pp. 74-75
Author(s):  
E.J. Jenkins ◽  
D.S. Tucker ◽  
J.J. Hren
Keyword(s):  
Thin Film ◽  
Size Range ◽  
Particle Aggregation ◽  
Ion Milling ◽  
Thin Sections ◽  
Α Phase ◽  
Convenient Means ◽  
Van Der Waals Attraction ◽  
Negative Feature ◽  
Film Substrate

The size range of mineral and ceramic particles of one to a few microns is awkward to prepare for examination by TEM. Electrons can be transmitted through smaller particles directly and larger particles can be thinned by crushing and dispersion onto a substrate or by embedding in a film followed by ion milling. Attempts at dispersion onto a thin film substrate often result in particle aggregation by van der Waals attraction. In the present work we studied 1-10 μm diameter Al2O3 spheres which were transformed from the amprphous state to the stable α phase.After the appropriate heat treatment, the spherical powders were embedded in as high a density as practicable in a hard EPON, and then microtomed into thin sections. There are several advantages to this method. Obviously, this is a rapid and convenient means to study the microstructure of serial slices. EDS, ELS, and diffraction studies are also considerably more informative. Furthermore, confidence in sampling reliability is considerably enhanced. The major negative feature is some distortion of the microstructure inherent to the microtoming operation; however, this appears to have been surprisingly small. The details of the method and some typical results follow.

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