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Showing 1 to 20 of 66 for “"Fabry-Perot interferometer"”.
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Extrinsic Fabry-Perot interferometer for surface acoustic wave measurement
… 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 the …
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Extrinsic Fabry-Perot Interferometer System Using Wavelength Modulated Source
… 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 multilongitudinal mode …
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Construction of a fast-scanning far-infrared Fabry-Perot interferometer.
Thesis: M.S., Massachusetts Institute of Technology, Department of Nuclear Engineering, 1973
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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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Imaging of volcanic trace gases by Fabry-Perot interferometer correlation spectroscopy
… this thesis, a novel imaging approach based on Fabry-Perot interferometer correlation spectroscopy (FPI CS) is presented. The technique exploits the periodic transmission profile of a Fabry-Perot interferometer (FPI) and its correlation to the (approximately periodically varying) target trace gas …
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Optical gas sensors based on correlation spectroscopy using a Fabry-Perot interferometer
… sensors based on correlation spectroscopy with a Fabry-Perot interferometer (FPI). In this technique the spectral FPI transmission fringe pattern is matched with ro-vibrational absorption lines. To produce the cross correlation principle the FPI fringe pattern must be shifted along the frequency …
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Imaging of bromine oxide and formaldehyde using Fabry-Perot interferometer correlation spectroscopy
… (HCHO) and bromine oxide (BrO) based on Fabry-Perot interferometer correlation spectroscopy in the UV wavelength range is presented. The technique makes use of the periodic transmission spectrum of a Fabry-Perot-Interferometer and its correlation with the approximately periodic narrowband …
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Spatial Modulation of Light Using Surface Waves in a Fabry-Perot Interferometer
Made available in DSpace on 2014-12-08T22:24:49Z (GMT). No. of bitstreams: 1 7020983.pdf: 2239558 bytes, checksum: 16ecbdc1c8e9805737c0059beb7da0fb (MD5) Previous issue date: 1970
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Application of a Fabry-Perot interferometer for measuring machining forces in turning operations
The FP interferometer was found to be feasible for detecting changes in machining forces. The fiber optic sensor was able to detect increases in strain corresponding to force increases detected by a dynamometer. The FP interferometer system must progress in several ways. A better data acquisition …
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Using a bistatic Fabry-Perot interferometer system to improve the estimation of thermospheric winds
… method for synchronously using two ground-based Fabry-Perot interferometers (FPI) to estimate thermospheric winds. When a single FPI is used, assumptions must be made to obtain meaningful wind data, but there are inherent limitations to the usefulness of the data caused by the use of these …
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Midlatitude thermospheric wind and temperature: networked Fabry-Perot interferometer observations and radiative transfer modeling
… thermosphere, primarily using networks of Fabry-Perot interferometers (FPIs). First, we describe an algorithm which estimates thermospheric line-of-sight wind and temperature from raw FPI data. This new algorithm has the advantage over previous work in that it provides accurate temperature …
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Optical Fiber Fabry-Perot Interferometer based Sensor Instrumentation System for Low Magnetic Field Measurement
… 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 same as …
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Three-dimensional wind measurements and modeling using a bi-static Fabry-Perot interferometer system in Brazil
… by 232.28 km and each is equipped with a Fabry-Perot interferometer (FPI) to measure neutral wind velocities and neutral temperatures using observations of the 630.0-nm emission caused by the dissociative recombination of O2+. The FPI systems can operate in two different modes: cardinal …
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Low coherence fibre optic Fabry-Perot sensors suitable for multiplexed strain measurement
… of the potential of low finesse in-fibre Fabry-Perot interferometer sensors for the measurement of strain. There are a number of areas of modern engineering applications where there is a need for an alternative to conventional resistive strain gauges; particularly where a number of such …
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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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Interferometric optical fibre sensor for highway pavements and civil structures
… is based on an extended (long) fibre optic Fabry-Perot interferometer. The Fabry-Perot arrangement was chosen for its simplicity, sensitivity, low cost and ease of installation.
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Corrosion detection using metal coatings on fiber optic sensors
… 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 ability of a …
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Reference interferometry techniques for nanodetection and biosensing
… Experiments performed with a Mach-Zehnder interferometer in parallel with an ultrahigh-Q microresonator for nanodetection of a record polystyrene particle size down to 12.5 nm radius are described. The first interferometry technique employed in this work sees the implementation of a …
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Optinių dangų fazinių charakteristikų matavimas rezonansų skenavimo interferometru /
… window and silver mirror as second mirror in the Fabry-Perot interferometer. Measured spectres matches the modelled ones. Spectre obtained using metal mirror has much higher interference modulation and narrower peaks. The group delay calculated from the captured spectres has extremely bad signal …
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Monolithic In-Plane Tunable Optical Filter
… By placing one mirror of a waveguide-based Fabry-Perot interferometer on an electrostatically-actuated beam, a tunable filter is constructed. This is the first demonstration of a waveguide-coupled MEMS tunable optical filter in any material system. Filters with a tuning range of 40 nm from a …
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