Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 48 for “"strain sensor"”.
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Longitudinal misalignment based strain sensor
A practical fiber optic strain sensor has been developed to measure strains in the range of 0.0 to 2.0 percent strain with a resolution ranging between 10 and 100 microstrain depending on sensor design choices. This intensity based sensor measures strain by monitoring strain induced longitudinal …
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Strain sensor using fiber bragg grating interrogation
… aims to focus on analyzing a novel design of strain sensor using Fiber Bragg Grating (FBG) interrogation. Studies on fiber optic sensors reported have mainly focused on FBG wavelength-based monitoring method by using optical spectrum analyzers (OSA). Although FBG has better strain sensitivity …
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Manufacturing Strain Sensor Via Printed Electronics Onto 3D Printed Substrates
… with 3D printing technology and fabricate a strain gauge sensor. We use various additive manufacturing (AM) techniques including 3D fused filament fabrication (FFF) printing, extrusion printing, and inkjet printing. We used silver nanoparticle ink and studied different conditions to maximize …
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Strain sensor array using printed single crystalline silicon on plastic substrate
… concentration, introduces a newly developed strain gauge using single crystalline silicon on plastic substrate, and describes the Colpitts oscillator that has the potential of wireless data transmission between sensor and data acquisition unit. In general, a metal strain gauge has high …
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Structural Monitoring With Fiber Bragg Grating Strain Sensor Array and Optical Frequency Domain Reflectometry
… of a three-element, 15.3 cm fiber Bragg grating strain sensor array with C-OFDR interrogation technique are demonstrated. The FBGA/C-OFDR was initially simulated using in-house software that incorporates transfer matrices. Compared to the previous techniques used, the transfer matrix method …
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Mechanical and optical behavior of a novel optical fiber crack sensor and an interferometric strain sensor
… of measurements from an optical fiber sensor requires a full understanding of its mechanical response to external action and the corresponding change in optical output. To quantify the mechanical behavior it is necessary to know the mechanical properties of the fiber coatings. A new …
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Enhancement of strain sensor sensitivity by combination of polarization maintaining fiber and single mode fiber in sagnac loop
… sensing. techniques provide a unique set. of sensors which are small, easy to fabricate, lightweight, immune to electromagnetic interference (EMI), high sensitivity, large scale multiplexing, and in most cases inexpensive to manufacture. These advantages are the motivation behind continued …
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Design, fabrication and testing of a fiber optic stress/strain sensor for soft stretchable materials using polarization imaging technique
… modified and used for noninvasive sensing of strain and stress in soft stretchable materials, such as latex and human tissues. Previously this sensing method was developed with free space bulk optics. In this study, a fiber optic based system is developed to investigate the potential …
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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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Dual-Use Strain Sensors for Acoustic Emission and Quasi-Static Bending Measurements
The application of piezoelectric sensors such as the ultrasonic transducer has significantly enhanced the fields of nondestructive evaluation (NDE). Their application of piezoelectric materials allows for the sensing of low energy, high frequency acoustic emission (AE) events such as fatigue …
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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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DEVELOPMENT OF A NANOCOMPOSITE SENSOR AND ELECTRONIC SYSTEM FOR MONITORING OF LOCOMOTION OF A SOFT EARTHWORM ROBOT
… types of biomimetic soft robots, no integratedsensor system is available to provide feedback locomotion. Here, a stretchable nanocomposite strain sensor with integrated wireless electronics to provide a feedbackloop locomotion of a soft robotic earthworm is presented. The ultrathin and soft …
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Concentric-core optical fiber sensors
… describes the implementation of a mechanical strain sensor which uses concentric core optical fiber waveguide as the sensing element. When this particular type of fiber is strained, a transfer of optical power occurs between propagating modes in the two concentric cylindrical cores of the …
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The Fabrication of Integrated Strain Sensors for “Smart” Implants using a Direct Write Additive Manufacturing Approach
… this PhD research is to fabricate an integrated strain gauge that is able to monitor implant strain for diagnosis of the bone healing process. The research work presents a method of fabricating electrical resistance strain gauge sensors using rapid and mask-less process by experimental …
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Microfabrication of conductive polymer nanocomposite for sensor applications
… as a functional element for various physical sensor applications. Microstructures of nanocomposite were realized through novel microcontact printing and laser ablation assisted micropatterning processes. Prototype devices including large-strain strain sensor and highly-sensitive pressure …
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High Fidelity Localization of Energy Autonomous mmIDS for Future Cyber-physical Systems
… a chipless cross-polarized reflectarray wireless strain sensor presenting the first every off-axis structural health monitoring fully-passive sensor for local strain monitoring for both adhered or embedded form-factors. Along with the design and characterization of the wireless strain sensor, a …
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Multi-axial strain monitoring of fibre reinforced thermosetting plastics using embedded highly birefringent optical fibre Bragg sensors
… conventional isotropic construction materials. Strain monitoring of an in-service structure should greatly enhance the insight and confidence in the (long-term) behaviour of high performance composite structures. Structural health monitoring necessitates the possibility of measuring multi-axials …
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Fibre bragg gratings for microwave photonics and sensing
… of fibre Bragg grating based magnetic-field sensors. Some theoretical background about fibre Bragg gratings, photosensitivity, fibre Bragg grating sensors and filters are presented. Fibre Bragg grating sensors in other industrial applications are highlighted. Some sensing principles are also …
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Remote epitaxy of III-N membranes on amorphous boron nitride
… GaN film. Surface acoustic wave (SAW) strain sensor fabricated by free-standing ultrathin single crystalline GaN film shows good performances. Process to solve GaN device heat dissipation is presented. Relaxed InGaN film grown on aBN monolayer provides a new research direction for GaN …
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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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