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Showing 1 to 20 of 46 for “"Strain Sensing"”.
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High temperature fiber optic strain sensing
Two high temperature fiber optic based strain sensors have been developed for use in a coal combustor environment. An intensity based sensor uses losses created by longitudinal misalignment as a sensing mechanism and has a maximum operating temperature of 700°C. An interferometric based sensor …
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A dual wavelength fiber optic strain sensing system
… (EFPI) has been extensively used as a strain sensor in various applications. However, like other interferometric sensors, the EFPI suffers from ambiguity in detecting directional changes of the applied perturbation, when the operating point is at a maxima or a minima on the transfer …
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Epoxy matrix composite strain sensing and cure monitoring
… an extrinsic Fabry-Perot interferometer (EFPI) strain sensor is described, which permits the state of cure of an epoxy matrix to be monitored, when the sensor is embedded in a polymeric matrix composite. By using a glass rod with a retroreflecting end for the target fiber in the EFPI sensor, the …
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An Evaluation of Optical Fiber Strain Sensing for Engineering Applications
… gratings. These fibers were bonded with AE-10 strain gage adhesive. The results indicate that lower strain amplitudes do not produce cause for concern, but that larger strain amplitudes (on the order of 3500 μ) may cause some sensors to become unreliable. The strain response of acrylate coated …
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Development to a Flexible Surface Acoustic Wave Sensor for Strain Sensing
… real-time monitoring of dynamic states including strains. SAW sensors are generally fabricated with a rigid piezoceramic substrate, incapable of adapting to highly curved surfaces or flexible objects. The ongoing demands of sensor adaptability with flexible substrates, which is also capable of …
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Characterizing Engineered Skeletal Muscle Rings as Actuators Using Strain Sensing Methods
… skeletal muscle rings. The instrument uses strain gauges to transduce a muscle ring contraction and has a verified resolution of 5 μN and 1.4 μm over the ranges of 5 μN and 1400 μm respectively. Experiments were carried out with four muscle ring specimens at six different structural …
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Quasi-Distributed Intrinsic Fabry-Perot Interferometric Fiber Sensor for Temperature and Strain Sensing
… and low-cost quasi-distributed temperature and strain sensors that can reliably work under harsh environment or in extended structures. There are two main drives for distributed fiber sensor research. The first is to lower cost-per-sensor so that the fiber sensors may become price-competitive …
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Temperature and strain sensing using rare earth fluorescence and Bragg gratings in optical fibres
… describes the study of the temperature and strain effects on rare earth fluorescence and Bragg gratings in optical fibres. The development and performance of simultaneous temperature and strain measurement systems utilising a combined technique of the fluorescence intensity ratio and the …
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Development of Multifunctional Polymer Nanocomposites with Hybrid Structures for Fabrication of Stretchable Strain Sensing and Wearable Electronic Devices
… devices are stretchable and skin-mountable strain sensors for human motion detections, sport activities monitoring, soft robotics, and entertainment technology. Several requirements such as high stretchability, flexibility, a wide working strain ranges, durability, fast response, easy signal …
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UV-Induced Intrinsic Fabry-Perot Interferometric Fiber Sensors and Their Multiplexing for Quasi-Distributed Temperature and Strain Sensing
Distributed temperature and strain sensing is demanded for a wide range of applications including real-time monitoring of industrial processes, health monitoring of civil infrastructures, etc. Optical fiber distributed sensors have attracted tremendous research interests in the past decade to meet …
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Distributed fibre sensing using microwave heterodyne detection of spontaneous Brillouin backscatter
… for many years in optical fibre temperature and strain sensing applications, due to the dependence of both the power and the frequency shift of the scattered radiation on these two quantities. Simultaneous temperature and strain sensing is possible if both the power and frequency shift are …
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Embedded Wireless Sensor Network for Aircraft/Automobile Tire Structural Health Monitoring
… few years. Within this area, the monitoring of strain on tires using wireless devices and networks is gaining prominence because these techniques do not require any wired connections. Various tire manufacturers are looking into SHM of automobile tires due to the Transportation Recall …
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Printed stretchable strain sensors for plant growth monitoring
… intervention has been challenging. Wearable strain sensors have made a great impact in various areas including human motion detection, health monitoring, soft robotics, and electronic skin, but have rarely been applied to plant biology research. The few reported wearable strain sensors for …
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Development of Flexible Pressure and Strain Sensors for Electronic Skin Applications
… Development of flexible pressure and strain sensing devices with human-like sensory capabilities has thus been the focus of many studies. Some novel challenging issues brought forth in this area are fabrication of flexible pressure sensors with tunable parameters and high sensitivity, …
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Topology Optimization of Multifunctional Nanocomposite Structures
… on stiffness, electrical conductivity, and strain-sensing performance. Stiffness is maximized by placing high concentrations of CNT in locations that either maximize the bending rigidity or minimize stress concentrations. Electrical conductivity is maximized by the formation of highly …
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A New Adaptive Array of Vibration Sensors
The sensing technique described in this dissertation produces modal coordinates for monitoring and active control of structural vibration. The sensor array is constructed from strain-sensing segments. The segment outputs are transformed into modal coordinates by a sensor gain matrix. An adaptive …
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Towards Structural Health Monitoring of Gossamer Structures Using Conductive Polymer Nanocomposite Sensors
… polymer nanocomposite materials for large strain sensing and develop a structural health monitoring algorithm for gossamer structures by using nanocomposites as strain sensors. Any health monitoring system works on the principle of sensing the response (strain, acceleration etc.) of the …
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Novel Uses of Distributed Optical Fiber Sensing for Geo-Mechanical Monitoring
… due to high costs. Distributed Optical Fiber Sensing (DOFS) is a powerful technology with advantages like long sensor length, real-time measurement capabilities, ease of installation, low cost, and distributed measurement. However, its application in rock mass monitoring is limited, especially …
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Mechanochromism and Strain-Induced Crystallization in Thiol-yne-derived Stereoelastomers
<p>Most elastomers undergo strain-induced crystallization (SIC) under tension; as individual chains are held rigidly in a fixed position by an applied strain, their alignment along the strain field results in a shift from strain-hardening (SH) to SIC, a sub-type of SH. A similar degree of …
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