Results 251 to 260 of about 324,422 (279)

Mechanochromic polyurethane strain sensor

Applied Physics Letters, 2014
In this Letter, we study the mechanical and optical response of a thermoplastic polyurethane blended with 0.5 wt. % of bis(benzoxazolyl)stilbene dye. The mechanochromic behavior of the material is characterized in a uniaxial stress-relaxation test by simultaneously acquiring the applied force, mechanical deformation, and fluorescence emission. To offer
F. Cellini, S. Khapli, S. D. Peterson, M. Porfiri   +3 more
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Polymer microresonator strain sensors

IEEE Photonics Technology Letters, 2005
A new class of fiber-based polymer microresonator strain sensors is analyzed and demonstrated. The flexible sensors are fabricated using a liftoff process and are based on the distortion of the microring by strain and the subsequent shift of the resonant wavelength. For the demonstration, a controlled strain was achieved by flexing the sensor.
B. Bhola, null Hyun-Chae Song, H. Tazawa, W.H. Steier   +3 more
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Bent-beam strain sensors

Journal of Microelectromechanical Systems, 1996
We examine a new class of sensitive and compact passive strain sensors that utilize a pair of narrow bent beams with an apex at their mid-points. The narrow beams amplify and transform deformations caused by residual stress into opposing displacements of the apices, where vernier scales are positioned to quantify the deformation.
Y.B. Gianchandani, K. Najafi
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Organic semiconductor strain sensors

63rd Device Research Conference Digest, 2005. DRC '05., 2005
In this paper, the authors report the first strain sensors using an organic semiconductor as the active element. The authors have used a doped organic semiconductor as the active element for low Young's modulus strain sensors. The sensor cross-section is shown.
null Soyoun Jung, T. Jackson
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Magnetostrictive Dynamic Strain Sensor

SAE Technical Paper Series, 2001
<div class="htmlview paragraph">The Magnetostrictive Dynamic Strain Sensor is a permanent-magnet constant-flux excitation sensor and thus requires no other electrical excitation or power source. It does not require any signal conditioning. Since it is a constant-flux dynamic sensor, it does not generate any offset voltage and it does not exhibit ...
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Polycrystalline silicon strain sensors

Sensors and Actuators, 1985
Abstract A new theoretical model for piezoresistance in both n- and p-type polycrystalline silicon is described. This model considers piezoresistance in both the grains and in the Schottky-type barrier regions around the grain boundaries. Transport across the grain boundary is assumed to be dominated by thermionic emission. The effect of strain is to
French, P J, Evans, A G R
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Nonplanar silicon strain sensors

IEEE Technical Digest on Solid-State Sensor and Actuator Workshop, 2003
Variations of conventional thin-membrane strain sensors are described which use a series of anisotropic etches ...
R.W. Bower, R.R. Spencer, D.D. Lee
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Strain gauge vibration sensor

The Journal of the Acoustical Society of America, 2002
A drive line vibration sensor includes a housing having a strain gage attached to the drive line component, and an actuator disposed within the housing. In operation, the actuator exerts a force upon the strain gage proportional to acceleration experienced by the actuator.
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Interferometric fiber strain sensor

2012 IEEE 3rd International Conference on Photonics, 2012
This paper proposed a strain sensing system using two-stage optical low coherence Mach-Zehnder interferometry. A 1.3-μm wavelength distributed feedback laser for an optical ruler assisted stepper motor was implemented to achieve 19.3-nm resolved characterization. The interferogram calibrated by the stepper motor combined with optical ruler on a 3-meter
Shih-Hsiang Hsu, Chih-Yuan Tsou, Jung-Chen Hsu   +2 more
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Sensors take the strain

Nature Photonics, 2007
A growing number of enterprises around the world are now commercializing fibre Bragg grating sensors for sensing everything from temperature and pressure to vibration and strain. Duncan Graham-Rowe reports.
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