Simultaneous Measurement of Strain and Temperature by Using a Micro-Tapered Fiber Grating

Yoon, Minseok; Park, Sangoh; Han, Young‐Geun

doi:10.1109/jlt.2011.2170552

Cited by 88 publications

(12 citation statements)

References 19 publications

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“…Simultaneous measurement of strain and temperature was demonstrated using a periodically micro-tapered fibre grating (period of 1.3 mm and the diameter of the tapered region was 76 mm), where the resonance wavelength was blue-shifted and the transmission decreased with increasing strain, while the opposite was observed for increasing temperature. Consequently, it was possible to discriminate the influences of strain and temperature with the sensitives of –0.55 nm/με and 49.6 pm/°C by measuring the resonant wavelength and the transmission with the sensitives of −0.32 dB/ με and −0.01 dB/°C [153].…”

Section: Applications Of Tapered Optical Fibre Sensorsmentioning

confidence: 99%

Tapered Optical Fibre Sensors: Current Trends and Future Perspectives

Korposh

James

Lee

et al. 2019

Sensors

158

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The development of reliable, affordable and efficient sensors is a key step in providing tools for efficient monitoring of critical environmental parameters. This review focuses on the use of tapered optical fibres as an environmental sensing platform. Tapered fibres allow access to the evanescent wave of the propagating mode, which can be exploited to facilitate chemical sensing by spectroscopic evaluation of the medium surrounding the optical fibre, by measurement of the refractive index of the medium, or by coupling to other waveguides formed of chemically sensitive materials. In addition, the reduced diameter of the tapered section of the optical fibre can offer benefits when measuring physical parameters such as strain and temperature. A review of the basic sensing platforms implemented using tapered optical fibres and their application for development of fibre-optic physical, chemical and bio-sensors is presented.

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Section: Applications Of Tapered Optical Fibre Sensorsmentioning

confidence: 99%

Tapered Optical Fibre Sensors: Current Trends and Future Perspectives

Korposh

James

Lee

et al. 2019

Sensors

158

View full text Add to dashboard Cite

show abstract

“…Then, due to the micro-tapering of the cladding, the evanescent portion of the electromagnetic field is spreading out to interact with the environment close to the surface of the fiber, enhancing the sensitivity. Finally, at the end of each expanded core region, the fiber returns to its original MFD, exciting the high-order cladding modes LP0m, as is observed in [60], [65]. These modes have axial symmetry, and therefore, the coupling of the fundamental core mode and the cladding modes in this symmetrical LPFG allows to create a wavelength selective fiber [66].…”

Section: Lpfg Fabrication and Operation Principlementioning

confidence: 99%

Switchable Ytterbium Fiber Laser Based on a Symmetrical Long-Period Fiber Grating

et al. 2021

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In this study, a switchable ytterbium-doped fiber laser based on symmetrical long-period fiber grating (LPFG) is presented. The LPFG is used as a wavelength-selective filter (WSF). Utilizing this WSF, the laser can emit one, two, or multiple stable output beams by adjusting the temperature on the LPFG from 20 °C to 600 °C. In addition, switching is also possible by adjusting the curvature of the LPFG from 0.399 to 0.709 m -1 . The symmetrical LPFG was fabricated by combining the cladding shaping with the thermal core expansion techniques by using a CO2-laser LZM-100 glass-processing system. The experimental results show a side-mode suppression ratio (SMSR) of 49 dB and a linewidth of 0.06 nm, within the range from 1038 to 1080 nm. In conclusion, the main achievement of this switchable laser is the high SMSR and stable output for high values of temperature, using a repeatable, simple, easy construction, and cost-effective laser tuning technique.

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“…Equation ( 6) means that when an axial strain is applied, the increased ∆S TCF will lead a tiny decrease in d. According to the principle of evanescent wave field, this reduced diameter of taper must bring a continuous loss of light energy. Therefore, in addition to the wavelength drift caused by photo-elastic effect [36], the intensity of fringes of t-TCF structure will be also changed significantly, which provides the possibility of intensity demodulation for axial strain sensing. Moreover, when ∆L S is a small value, k can be regarded as a constant and the intensity variation may be linearly decreased with the added axial strain.…”

Section: Principles and Simulationsmentioning

confidence: 99%

Ultra-Sensitive Intensity Modulated Strain Sensor by Tapered Thin-Core Fiber Based Modal Interferometer

et al. 2021

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In this paper, to enhance practicality, a novel tapered thin-core fiber (t-TCF) based modal interferometer is proposed and demonstrated experimentally. The light field distribution of t-TCF structure is investigated by a beam propagation method, and the quantitative relationship is gained between light intensity loss and waist diameter. Under ~30 μm waist diameter, multiple t-TCF based sensor heads are fabricated by arc-discharged splicing and taper techniques, and comprehensive tests are performed with respects to axial strain and temperature. The experimental results show that, with near-zero wavelength shift, obvious intensity strain response is exhibited and negative-proportional to the reduced length of TCF. Thus, the maximum sensitivity reaches 0.119 dB/με when the TCF length is equal to 15 mm, and a sub-micro-strain detection resolution (about 0.084 με) is obtained. Besides, owing to the flat red-shifted temperature response, the calculated cross-sensitivity of our sensor is compressed within 0.32 με/°C, which is promising for high precision strain related engineering applications.

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Simultaneous Measurement of Strain and Temperature by Using a Micro-Tapered Fiber Grating

Cited by 88 publications

References 19 publications

Tapered Optical Fibre Sensors: Current Trends and Future Perspectives

Tapered Optical Fibre Sensors: Current Trends and Future Perspectives

Switchable Ytterbium Fiber Laser Based on a Symmetrical Long-Period Fiber Grating

Ultra-Sensitive Intensity Modulated Strain Sensor by Tapered Thin-Core Fiber Based Modal Interferometer

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