Optical Fiber Inclinometer Based on a Fiber Taper Cascading a Peanut-Shape Structure

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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“…1°. A sensitivity of −4.49 nm/° was achieved using an abrupt taper cascaded with a waist enlarged taper [145].…”

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 proposed inclinometer based on tFBG in a FRL system was compared with other inclinometers like those described in references [ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 ]. The inclination angle range is shown in Table 1 .…”

Section: Discussionmentioning

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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“…In optical communication, they can be used as passive notch filters [ 3 , 4 ], acousto-optic tunable filters [ 5 ], super-continuum light generation [ 6 ], tunable fiber lasers [ 7 ], to name a few. In sensing, they can be used to probe a myriad of measurands: physical (strain [ 8 , 9 , 10 ], stress [ 11 , 12 ], force [ 13 ], pressure [ 14 ], angle [ 15 , 16 ] and temperature [ 17 , 18 , 19 ]), chemical [ 20 , 21 ], bio [ 22 ], etc. Those FTs may be fabricated by different processes, most frequent, stretching a heated length of commercial single-mode fiber is the preferable one because of the cost and simplicity of fabrication.…”

Section: Introductionmentioning

confidence: 99%

Coaxial Mach–Zehnder Digital Strain Sensor Made from a Tapered Depressed Cladding Fiber

Celaschi

Grégoire

Messaddeq

et al. 2022

Sensors

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An in-line digital optical sensor was proposed. It was built from a tapered depressed-cladding single-mode fiber and modeled as a coaxial Mach–Zehnder interferometer. The principle of operation of the optical digital sensor is based on the computation of the number of optical power transfer turning points (PTTP) from the transmission data of the component. Biconic tapers with high values of PTTP, high spectral resolution, high extinction ratio, and low insertion loss were modeled, fabricated, and characterized. As a proof of concept, an in-line digital strain sensor was fabricated and characterized. It presents a free spectral range of 1.3 nm, and produced 96 PTTP, at λ0 = 1.55 μm, under stretch of ΔL = 707 µm, therefore producing a digital resolution of 7.4 µm/PTTP. The sensor also produced a quasi-symmetric response to stretch and compression.

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Optical Fiber Inclinometer Based on a Fiber Taper Cascading a Peanut-Shape Structure

Cited by 21 publications

References 12 publications

Tapered Optical Fibre Sensors: Current Trends and Future Perspectives

Tapered Optical Fibre Sensors: Current Trends and Future Perspectives

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

Coaxial Mach–Zehnder Digital Strain Sensor Made from a Tapered Depressed Cladding Fiber

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