Comparative study between LPFG- and FBG-based bending sensors

Taghipour, Ata; Rostami, Ali; Bahrami, Manouchehr; Baghban, Hamed; Dolatyari, Mahboubeh

doi:10.1016/j.optcom.2013.09.020

Cited by 33 publications

(27 citation statements)

References 23 publications

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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].…”

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confidence: 99%

“…For example, those based on Bragg gratings exhibit low sensitivity for small angles, typically require additional reference sensors, and are not capable of distinguishing the orientation of the bending [1][2][3][4][5]. On the other hand, the performance of LPG-based bending sensors can be compromised by surrounding or packaging materials as LPGs are sensitive to the medium that envelops the optical fiber [6][7][8][9][10][11][12]. The disadvantage of some interferometric bending sensors is their complexity as they require several components that must be precisely aligned [16].…”

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confidence: 99%

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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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Photonic crystal fiber interferometric vector bending sensor

2015

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“…Moreover, LPFG-based bending sensors on the standard SMF-28 optical fiber have maximum bending sensitivity of 8.78 nm/m À 1 with the curvature range of 0-5 m À 1 in the theoretical simulation results [19]. Allsop modified using an 800-nm femtosecond laser in the standard singlemode fiber (SMF-28).…”

Section: Introductionmentioning

confidence: 92%

Femtosecond laser fabrication of long period fiber gratings by a transversal-scanning inscription method and the research of its orientational bending characteristics

Dong

Sun

et al. 2015

Optics & Laser Technology

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“…Various applications of these gratings have been reported in the literature, including sensing of physical parameters [1][2][3][4][5], adulteration detection [6][7][8][9][10] and detection of harmful radiation [11]. Recently the sensors based on the long-period gratings have been used for studying E. Coli bacteria [12] and human serum [13].…”

Section: Introductionmentioning

confidence: 99%

Detection of fungi using a long-period fibre grating

Gambhir¹,

Gupta²,

John³

et al. 2017

Ukr. J. Phys. Opt.

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Abstract:We present the first-time application of long-period fibre gratings written with a copper-vapour laser for detection of fungi in plants. The long-period gratings are used for identification of Trichoderma fungi species. A significance of our work lies in the facts that these bioagents protect plant roots against pathogens that can cause serious fungal diseases, resulting in great crop yield losses and, moreover, these can cause a lethal effect on human beings. We study such Trichoderma species as T. Harzianum, T. Viride and T. Longibacterium. They reveal characteristic attenuation peaks respectively at the resonance wavelengths 1524, 1520 and 1522 nm. The corresponding transmission dips change from 63.75 dB for the case of water to 54.85, 57.34 and 59.76 dB for the cases of water solutions of T. Harzianum, T. Viride and T. Longibacterium, respectively.

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Comparative study between LPFG- and FBG-based bending sensors

Cited by 33 publications

References 23 publications

Photonic crystal fiber interferometric vector bending sensor

Photonic crystal fiber interferometric vector bending sensor

Femtosecond laser fabrication of long period fiber gratings by a transversal-scanning inscription method and the research of its orientational bending characteristics

Detection of fungi using a long-period fibre grating

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