Modified fringe-counting technique applied to a dual-cavity fiber Fabry-Pérot vibrometer

Pullteap, Saroj

doi:10.1117/1.2802094

Cited by 16 publications

(11 citation statements)

References 15 publications

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“…Pullteap et al [25] presented a modified fringe-counting technique applied to a dual-cavity fiber Fabry-Pérot vibration meter. The scheme of the structure is shown in Figure 13, where continuous series of interference signals can be processed for fringe-counting.…”

Section: Extrinsic Fiber Fabry Pérot Interferometer Vibrationsmentioning

confidence: 99%

Vibration Detection Using Optical Fiber Sensors

2010

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Condition monitoring of heavy electromechanical equipment is commonly accomplished in the industry using vibration analysis. Several techniques, mainly based on capacitive and piezoelectric accelerometers, have been applied for predictive maintenance. However, the negative influence of the electromagnetic interference (EMI) can be a real problem when electrical signals are used to detect and transmit physical parameters in noisy environments such as electric power generator plants with high levels of EMI. Optical fiber sensors are increasingly used because of the nonelectrical nature of signals. In this paper, the most frequently used vibration optical fiber sensors will be reviewed, classifying them by the sensing techniques and measurement principles. The main techniques, intensity modulation, fiber bragg gratings and Fabry-Pérot Interferometry, will be reviewed here.

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Section: Extrinsic Fiber Fabry Pérot Interferometer Vibrationsmentioning

confidence: 99%

Vibration Detection Using Optical Fiber Sensors

2010

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“…Meniscus Displacement Measurement : The root mean square (rms) displacement of the water surface was measured using an optically generated dual‐cavity Fabry–Pérot interferometer with the modified fringe‐counting technique 49. In principle, any change in the optical path length of the cavity iss reflected in a phase change of the laser beam.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of I‐131 labelled 4‐iodophenylacetic acid

Szűcs

Sathekge

Marjanovic-Painter

et al. 2010

Labelled Comp Radiopharmac

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Phenylacetate has been reported to have a potent anti-proliferative and anti-differentiating effect in haematological malignancies and in solid tumours at non-toxic concentrations. This study is a preliminary investigation into the potential of 4-iodophenylacetic acid radiolabelled by 131 I as a radiopharmaceutical equivalent. The radiolabelling by isotope exchange gave a radiochemical yield of 5376%, and a radiochemical purity of 97.871.2% as qualified by HPLC. The product contained 4% ester by-product and is suitable for studies in animals.

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“…The applicable frequencies range from several megahertz (corresponding to the coherence length of the light source) to several gigahertz (corresponding to the upper limit of the measurable frequency of a standard ESA). This method is free from errors caused by power fluctuations, leading to higher stability than that of the well-known powerdomain fringe-counting techniques using a narrowband light source and an optical power meter (or an oscilloscope) [51]- [53]. Fig.…”

Section: A Mach-zehnder Interferometrymentioning

confidence: 99%

Fiber-Optic Interferometry Using Narrowband Light Source and Electrical Spectrum Analyzer: Influence on Brillouin Measurement

Mizuno

Hayashi

2014

J. Lightwave Technol.

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We observe an interference pattern using a simple fiber-optic interferometer consisting of an electrical spectrum analyzer and a narrowband light source, which is commonly employed for observing the Brillouin gain spectrum. This interference pattern expands well beyond the frequency range corresponding to the Brillouin frequency shift in silica fibers (ß11 GHz at 1.55 μm). Using both silica single-mode and polymer optical sensing fibers, we then experimentally prove that the distinctive noise in a selfheterodyne-based Brillouin measurement with an unoptimized polarization state originates from the interference between the reference light and the Fresnel-reflected light. This noise can be almost completely suppressed by employing a delay line that is longer than the coherence length of the light source and by artificially applying a high loss near the open end of the sensing fiber. Index Terms-Brillouinscattering, fiber-optic interferometry, nonlinear optics, polymer optical fiber. I. INTRODUCTION S UBSTANTIAL efforts have been directed toward the study of Brillouin scattering in optical fibers [1] in the last 40 years, and a number of related applications have been developed, including lasing [1], microwave signal processing [2], core alignment [3], optical memory [4], slow light generation [5], and distributed strain and temperature sensing [6]-[10]. To improve the performance of these applications, Brillouin scattering properties have been investigated not only in standard silica glass fibers [11], [12] but also in various specialty fibers, such as tellurite fibers [13], [14], bismuth-oxide fibers [14], chalcogenide fibers [15], photonic crystal fibers [16], and fibers doped with rare-earth ions (erbium, thulium, etc.) [17], [18]. Each fiber type has its own distinctive features; for instance, the Brillouin scattering power in tellurite and chalcogenide fibers is far higher than that in other fibers, whereas the Brillouin scattering power in erbium-doped fibers at 1.55 μm can be tuned by controlling the 980-nm pump power. However, all of these glass fibers are fragile and require careful handling; in sensing Manuscript

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Modified fringe-counting technique applied to a dual-cavity fiber Fabry-Pérot vibrometer

Cited by 16 publications

References 15 publications

Vibration Detection Using Optical Fiber Sensors

Vibration Detection Using Optical Fiber Sensors

Synthesis of I‐131 labelled 4‐iodophenylacetic acid

Fiber-Optic Interferometry Using Narrowband Light Source and Electrical Spectrum Analyzer: Influence on Brillouin Measurement

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