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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 19 of 19 for “"extrinsic fabry-perot interferometer"”.
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Extrinsic Fabry-Perot interferometer for surface acoustic wave measurement
A surface acoustic wave sensor based on an extrinsic Fabry-Perot interferometer is described. A single-mode fiber, used as the input/output fiber, and a multimode fiber, used mainly as a reflector, form an air-gap that acts as a low-finesse Fabry-Perot cavity. The Fresnel reference reflection from …
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Extrinsic Fabry-Perot Interferometer System Using Wavelength Modulated Source
… thesis proposes a new measurement system for the extrinsic Fabry-Perot interferometer (EFPI) sensor. Using a wavelength modulated source and a novel extended-gap EFPI, some of the limitations of interferometric signal demodulation are overcome. By scanning the output wavelength of a …
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High-finesse/small gap extrinsic Fabry-Perot interferometer and applications
Conventional fiber-optic interferometers suffer from limitations that prevent real-time, absolute sensing of weak perturbations. A new sensing system that overcomes the above drawbacks by using a broadband light source, high-finesse/small-gap extrinsic Fabry-Perot cavity, and a novel demodulation …
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Corrosion detection using metal coatings on fiber optic sensors
… as candidates for corrosion detection: the extrinsic Fabry-Perot interferometer (EFPI), the absolute extrinsic Fabry-Perot interferometer (AEFPI), and the long period grating (LPG) fiber optic sensor. The corrosion monitoring technique used with the EFPI and AEFPI sensors exploits the …
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A dual wavelength fiber optic strain sensing system
The extrinsic Fabry-Perot interferometer (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 …
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Optical sensing as a means of monitoring health of multicomputer networks
… thesis investigates the implementation of the extrinsic Fabry-Perot interferometer into an optical hybrid communications/sensing network. A testbed of personal computers, acting as nodes of a multicomputer, are used to monitor the integrity of the network to a high degree of accuracy. When a …
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Epoxy matrix composite strain sensing and cure monitoring
An adaptation of 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 …
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The split-cavity cross-coupled extrinsic fiber interferometer
… sensor configurations in use today, the Fabry-Perot interferometer has been shown to have a high sensitivity. The extrinsic Fabry-Perot sensor (EFPI) is a very good candidate for smart structure applications. In this thesis, a new configuration of the extrinsic Fabry-Perot interferometer …
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Controlled Fabrication System of Fabry-Perot Optical Fiber Sensors
… different categories of these sensors is the Extrinsic Fabry-Perot interferometer (EFPI) sensor which is inherently simple and requires only modest amount of interface electronics. These advantages make it suitable for many practical applications. Investigating a cost-effective, reliable and …
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Material process monitoring with optical fiber sensors
… of a Fresnel reflectometer with those of the extrinsic Fabry-Perot interferometer. For monitoring cure, a broadband source is used so the output intensity of the sensor is amplitude-modulated as the refractive index of the composite is increased during the polymerization process. Post-cure, a …
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NOVEL SENSOR PLATFORMS BASED ON FABRY-PEROT RESONATORS FOR APPLICATIONS IN ENVIRONMENTAL GEOPHYSICS
<p>"Fabry-Perot resonator sensors have been widely used for various physical and chemical measurements owing to their unique advantages over traditional sensors such as high measurement resolution, mechanically robust, and distributed sensing capabilities. This dissertation focuses on the …
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A fiber optic interferometer for measuring sub-micrometer displacements of ciliary bundles
… range and measure their displacement. An extrinsic Fabry-Perot interferometer (EFPI) was developed to measure the response of a ciliary bundle that is subjected to a force applied by a glass whisker. 'Imitation bundles', similar in stiffness to living ciliary bundles, were made to test the …
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Fiber Optic Sensors for On-Line, Real Time Power Transformer Health Monitoring
… monitoring. The first work is an optical fiber extrinsic Fabry-Perot interferometric sensor for PD detection. By filling SF6 into the sensor air cavity of the extrinsic Fabry-Perot interferometer sensor, the last potential obstacle that prevents this kind of sensors from being installed inside …
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Optical Fiber Fabry-Perot Interferometer based Sensor Instrumentation System for Low Magnetic Field Measurement
… changes in the sensor gage using a modified extrinsic Fabry-Perot Interferometer configuration. Because of the magnetostrictive reflector the gap length depends on the magnetic fields applied to the sensor. Since the diameter of the magnetostrictive sensor gage is 125 micrometer which is the …
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Experimental Measurements of Vestibular Hair Bundle Stiffness in the Red Ear Slider Turtle Utricle
… to produce a force on the tip of the bundle, an extrinsic Fabry-Perot interferometer (EFPI) to measure the displacement of the pipette, and a photoelectronic motion transducer (PMT) to measure the displacement of the bundle. Using the measured values of whisker stiffness, whisker displacement, …
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The Implementation of a Photoelectronic Motion Transducer for Measuring the Sub-Micrometer Displacements of Vestibular Bundles
… the base of the whisker moves is measured by an extrinsic Fabry-Perot interferometer (EFPI). The magnitude of this movement is compared with the amount the bundle is deflected, detected by a photoelectronic motion transducer (PMT). Knowing these displacements and the stiffness of the glass …
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Cross sensitivity analysis of optical fibre-based sensing for high pressure, high temperature measurement in oil and gas applications.
… and analysed the spectral characterization of a Fabry-Perot interferometer (FPI) sensor and the interaction with physical parameters. Preliminary results of this configuration are used to eliminate the issue of temperature-pressure cross-sensitivity and effectively improve the resolution of the …
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Optical Path Length Multiplexing of Optical Fiber Sensors
… interferometry techniques to multiplex extrinsic Fabry-Perot interferometers and optical path length two-mode sensors. Additionally, OPLM techniques can be used to design an optical fiber sensor to detect pressure/force/acceleration and temperature simultaneously at a single point. While …
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Real-Time Signal Processing and Hardware Development for a Wavelength Modulated Optical Fiber Sensor System
… for the system model of the wavelength modulated extrinsic Fabry-Perot interferometric (EFPI) optical fiber sensor, and then design and build all the hardware and software necessary to implement a stand-a