An optical fiber curvature sensor based on photonic crystal fiber modal interferometer

Gong, Huaping; Song, Haifeng; Li, Xiaorui; Wang, Jianfeng; Dong, Xinyong

doi:10.1016/j.sna.2013.02.022

Cited by 71 publications

(27 citation statements)

References 15 publications

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“…Most of them are focused on the surrounding refractive index (SRI), strain, or temperature sensing. Few of them are focused on bending sensing , and in the fabrication of these curvature sensors, offset‐splicing or tapered method was usually used , which would make the sensors breakable. So these sensors are not very suitable for practicality.…”

Section: Introductionmentioning

confidence: 99%

Index‐insensitive curvature sensor based on holey fiber modal interferometer

Guan

2014

Micro & Optical Tech Letters

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An optical fiber curvature sensor based on holey fiber (HF) modal interferometer is demonstrated experimentally. The sensor is fabricated by a length of 2.4 cm HF which is spliced between two single mode fibers. Different resonant peaks have different curvature characteristics, and the sensitivity of 1.815 nm m−1 is achieved in the range of 0–0.905 m−1 for the peak around 1504 nm. The sensor is insensitive to the surrounding refractive index, so it is more suitable for index‐insensitive wavelength‐dependent curvature measurement. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1709–1711, 2014

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Section: Introductionmentioning

confidence: 99%

Index‐insensitive curvature sensor based on holey fiber modal interferometer

Guan

2014

Micro & Optical Tech Letters

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“…To achieve such features, the optical fiber sensor community has proposed a number of sensing architectures. Most of them are based on Bragg gratings [1][2][3][4][5], long-period gratings (LPGs) [6][7][8][9][10][11][12], interferometers [13][14][15][16][17][18][19], or on intensity measurements involving optical fibers [20][21][22][23].…”

mentioning

confidence: 99%

“…Bending sensors based on specialty optical fibers, such as multicore fibers (MCFs) [1,18] or photonic crystal fibers (PCFs) [14,15,17], partially overcome the aforementioned disadvantages. However, the bending sensitivities of MCF sensors [18] are low for small angles, while the fabrication of some PCF bending sensors involves a manual process that typically leads to low reproducibility [14,17].…”

mentioning

confidence: 99%

Photonic crystal fiber interferometric vector bending sensor

2015

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A compact and highly sensitive interferometric bending sensor (inclinometer) capable of distinguishing the bending or inclination orientation is demonstrated. The device operates in reflection mode and consists of a short segment of photonic crystal fiber (PCF) inserted in conventional single-mode optical fiber (SMF). A microscopic collapsed zone in the PCF-SMF junction allows the excitation and recombination of core modes, hence, to build a mode interferometer. Bending on the device induces asymmetric refractive index changes in the PCF core as well as losses. As a result, the effective indices and intensities of the interfering modes are altered, which makes the interference pattern shift and shrink. The asymmetric index changes in the PCF make our device capable of distinguishing the bending orientation. The sensitivity of our sensor is up to 1225 pm/degree and it can be used to monitor small bending angles (±2°). We believe that the attributes of our sensor make it appealing in a number of applications.

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“…It is worth noting that our sensor has the capability of distinguishing the bending orientation and operates in a small angle region. We believe that such features have not been observed in other fibre optic bending sensors reported until now [10][11][12][13][14][15].…”

Section: Resultsmentioning

confidence: 71%

Supersensitive sensors based on multicore optical fibres

et al. 2016

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In this work, we demonstrate the use of particularly characterised multicore optical fibres (MCFs) to devise compact, compellingly simple, ultrasensitive interferometric sensors which are capable of sensing single or multiple physical parameters. Generally, our devices operate in reflection mode and consist of a few centimetres of MCF fusion spliced to standard single-mode optical fibre (SMF). The tools and instrumentation needed to fabricate our devices are a conventional fibre cleaver and a fusion splicing machine. We demonstrate a highly-sensitive bending sensor (inclinometer) with a MCF with three strongly coupled cores which is capable of distinguishing multiple bending or inclination orientations, and also a force sensor based on MCF with seven coupled cores. In both cases the devices are interrogated with a low-power LED and a miniature spectrum analyser. Bending or force on the MCF induces drastic changes of the supermodes, their excitation, and consequently, on the reflected spectrum (interference pattern).

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An optical fiber curvature sensor based on photonic crystal fiber modal interferometer

Cited by 71 publications

References 15 publications

Index‐insensitive curvature sensor based on holey fiber modal interferometer

Index‐insensitive curvature sensor based on holey fiber modal interferometer

Photonic crystal fiber interferometric vector bending sensor

Supersensitive sensors based on multicore optical fibres

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