Optical inclinometer based on a tilted fiber Bragg grating with a fused taper

Guo, Chenxi; Chen, Debao; Shen, Changyu; Lu, Yanfang; Liu, Huanan

doi:10.1016/j.yofte.2015.04.004

Cited by 27 publications

(4 citation statements)

References 17 publications

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“…Moreover, technical literature both in structural [19][20][21][22] and in geotechnical fields [23,24] involves monitoring systems based on fibre Bragg grating (FBG) sensing technique: with this technique, only small portions of the optical cable constitute the sensors. In this way, the main limitation of the traditional instruments, that provide local information not representative of the entire element to be monitored, is not overcome.…”

Section: Introductionmentioning

confidence: 99%

An innovative geotechnical and structural monitoring system based on the use of NSHT

Coscetta

Damiano

D'Ettore

et al. 2022

Smart Mater. Struct.

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The development of innovative EWS, SHM and SHMR Systems is essential to prevent the occurrence of potentially dangerous events on engineering works, buildings and in the natural environment. Their effectiveness can be improved by using new generation sensors able to realize widespread, low-cost monitoring at increasing spatial and temporal resolution. The main aim of the research is, therefore, to develop a versatile strain transducer capable of monitoring elements of different nature such as slopes, buildings and linear infrastructures performing distributed real-time measurements. The paper introduces a New Smart Hybrid Transducer (NSHT), a strain transducer belonging to the Distributed Optical Fiber Sensors (DOFS) family, appositely designed to overcome the drawbacks of traditional solutions. An experimental laboratory setup was arranged to test its reliability and a comparison between measurements retrieved by the NSHT and traditional devices were done. The results showed that the NSHT is able to perform strain monitoring with spatial resolution as high as 5cm and accuracy comparable to that of the traditional devices. Finally, an ISGMS (Integrated Structural and Geotechnical Monitoring System) architecture based on its use is proposed for the Petacciato site, where a deep-seated landslide affects the historical town and some infrastructures. To realize a single communication line in such a complex monitoring system, where multiple elements have to be monitored, a specific tool was also designed and tested, that allows the exact spatial identification of the various elements under observation. Although on-site validation is needed, these early results are encouraging and demonstrate that the NSHT is a low-cost transducer with great potential and that, looking forward, it can be used to increase the effectiveness of the existing EW, SHM and SHMR Systems. The development of systems involving NSHT also follows the new approach to innovation policy contributing to different points of the 2030 Agenda.

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Section: Introductionmentioning

confidence: 99%

An innovative geotechnical and structural monitoring system based on the use of NSHT

Coscetta

Damiano

D'Ettore

et al. 2022

Smart Mater. Struct.

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“…Therefore, they perform well under small inclination change conditions. Typically, optical fiber inclinometers consist of a fiber Bragg grating (FBG) [ 12 ], tilted fiber grating (TFG) [ 14 ] and long period fiber grating (LPFG) [ 15 ], etc. Besides, dislocation optical fibers [ 16 ] and multi-core optical fibers [ 17 ] are also used to manufacture inclinometers.…”

Section: Introductionmentioning

confidence: 99%

A Temperature Independent Inclinometer Based on a Tapered Fiber Bragg Grating in a Fiber Ring Laser

Lin

Zhou

Shao

et al. 2021

Sensors

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We demonstrate a new concept for an all-fiber inclinometer based on a tapered fiber Bragg grating (tFBG) in a fiber ring laser (FRL) with the capability of measuring the tilt angle and temperature simultaneously. The sensor performance is analyzed theoretically and investigated experimentally. The dependence of tilt angle on the spectral response in variable temperature conditions was measured. Two inclinometers with different lengths have been fabricated and characterized in FRL. The sensitivity is 0.583 dB/° and 0.849 dB/°, respectively, in the range of 0° to 90°. Thanks to the FRL system, narrow 3-dB bandwidth (<0.1 nm) and high optical signal-to-noise ratio (~60 dB) are achieved. The tFBG in the FRL system can be used for working as a temperature insensitive inclinometer. The results suggested that the proposed inclinometer has the advantages of compact size and convenient manufacture, enhancing its potential for application prospect.

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“…Both tilted fiber Bragg grating (TFBG) and long period fiber grating (LPFG) are typical structures to couple core modes to the cladding modes, which can be applied as inclinometers. [10][11][12] However, the sensing characteristics based on the transmission spectrum limit their application where a single-ended probe would be preferable (in vivo applications, for instances). 13 As another type of fiber-optic device, in-fiber interferometers with separate interference arms are also sensitive to tilt.…”

Section: Introductionmentioning

confidence: 99%

Orientation-dependent Fiber-optic Inclinometer Based on Core-offset Michelson Interferometer

Wang

Zheng

ZHANG

2021

Preprint

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An in-fiber Michelson interferometer (MI) inclinometer, which consists of misalignment-spliced fiber with end coating, is proposed and experimentally demonstrated. The incident light divided at the misalignment-spliced joint is reflected at the end coating, and then re-coupled into the core of the fiber. Due to the phase difference between the core mode and the cladding mode, a typical Michelson interference is obtained. The fiber near the misalignment-spliced joint is inserted in two capillary quartz tubes. The inclination of the capillary quartz tube leads to a significant deformation and curvature of the misalignment-spliced joint, which causes the wavelength and amplitude of the MI spectrum to change. The experimental results indicate a good response within the angle range of 0º to 50º. Both the wavelength modulation and intensity modulation are realized, with sensitivities of 0.55 nm/deg and 0.17 dB/deg, respectively. Moreover, the sensor shows a strong orientation dependence due to the asymmetric structure in the misalignment-spliced joint.

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Optical inclinometer based on a tilted fiber Bragg grating with a fused taper

Cited by 27 publications

References 17 publications

An innovative geotechnical and structural monitoring system based on the use of NSHT

An innovative geotechnical and structural monitoring system based on the use of NSHT

A Temperature Independent Inclinometer Based on a Tapered Fiber Bragg Grating in a Fiber Ring Laser

Orientation-dependent Fiber-optic Inclinometer Based on Core-offset Michelson Interferometer

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