Journal ArticleDOI
Fiber-optic extrinsic Fabry–Perot interferometer sensors with three-wavelength digital phase demodulation
Markus Schmidt,Norbert Fürstenau +1 more
TLDR
A three-wavelength-based passive quadrature digital phase-demodulation scheme has been developed for readout of fiber-optic extrinsic Fabry-Perot interferometer vibration, acoustic, and strain sensors, resulting in significant improvement of the linearity of the sensor characteristics.Abstract:
A three-wavelength-based passive quadrature digital phase-demodulation scheme has been developed for readout of fiber-optic extrinsic Fabry–Perot interferometer vibration, acoustic, and strain sensors. This scheme uses a superluminescent diode light source with interference filters in front of the photodiodes and real-time arctan calculation. Quasi-static strain and dynamic vibration sensing with up to an 80-kHz sampling rate is demonstrated. Periodic nonlinearities owing to dephasing with increasing fringe number are corrected for with a suitable algorithm, resulting in significant improvement of the linearity of the sensor characteristics.read more
Citations
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Journal ArticleDOI
Chronology of Fabry-Perot interferometer fiber-optic sensors and their applications: a review.
TL;DR: A wide variety of FPI sensors are reviewed in terms of fabrication methods, principle of operation and their sensing applications in a study on interferometric optical fiber sensors.
Journal ArticleDOI
Fiber Fabry-Perot Sensors For Detection Of Partial Discharges in Power Transformers
TL;DR: Test results indicate that these fiber optic acoustic sensors are capable of faithfully detecting acoustic signals propagating inside transformer oil with high sensitivity and wide bandwidth.
Journal ArticleDOI
Miniature fiber-optic pressure sensor with a polymer diaphragm
Edvard Cibula,Denis Donlagic +1 more
TL;DR: The fabrication technique presented facilitates production of simple and low-cost disposable pressure sensors by use of materials with that ensure the required biocompatibility.
Journal ArticleDOI
Fiber Bragg grating strain sensor demodulation with quadrature sampling of a Mach–Zehnder interferometer
TL;DR: A simple and highly sensitive phase-demodulation technique is proposed and its use for a fiber Bragg grating strain sensor is experimentally demonstrated, and strain sensing at as much as a 30-kHz sampling rate was obtained.
Journal ArticleDOI
A Miniature Fiber-Optic Refractive-Index Sensor Based on Laser-Machined Fabry–Perot Interferometer Tip
TL;DR: In this article, a fiber-optic Fabry-Perot (F-P) refractive index (RI) sensor machined by 157 nm laser is proposed, which consists of a micro air F-P cavity near the tip of a single-mode fiber with a micro channel on the fiber tip used as both inlet and outlet.
References
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Journal ArticleDOI
Quadrature phase-shifted, extrinsic Fabry-Perot optical fiber sensors
TL;DR: It is demonstrated the operation of a quadrature phase-shifted extrinsic Fabry-Perot fiber-optic sensor for the detection of the amplitude and the relative polarity of dynamically varying strain.
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Extrinsic Fabry-Perot interferometer vibration and acoustic sensor systems for airport ground traffic monitoring
TL;DR: In this paper, the authors describe new fibre optic vibrational and acoustic sensor systems developed for airport ground traffic monitoring, and the theoretical background of the extrinsic Fabry-Perot interferometer (EFPI) sensors is derived, and results of laboratory experiments as well as initial field tests in an experimental surface movement guidance and control system (ESMGCS) at Braunschweig airport are reported.
Journal ArticleDOI
Passive signal processing for a miniature Fabry-Perot interferometric sensor with a multimode laser-diode source.
A. Ezbiri,Ralph P. Tatam +1 more
TL;DR: A passive signal-processing technique for addressing a miniature low-finesse fiber Fabry–Perot interferometric sensor with a multimode laser diode with quantitative discussion of miscalibration and systematic errors is presented.
Journal ArticleDOI
Linearised polarimetric optical fibre sensor using a 'heterodyne-type' signal recovery scheme
TL;DR: A 'heterodyne-type' detection scheme for use with single-mode-fibre polarimetric sensors is described which overcomes the problems of 'fringe' ambiguity and small-signal fading normally associated with polarIMetric sensors.
Journal ArticleDOI
Dynamic pressure sensing with a fiber-optic polarimetric pressure transducer with two-wavelength passive quadrature readout
TL;DR: Results of initial experiments with 60-ms pressure relaxation-time constants with the fringe-counting technique demonstrate the performance that was predicted theoretically, and the measured pressure sensitivity exhibits excellent agreement with the previous research of Bock and Urbanczyk.