Strain sensor based on gourd-shaped single-mode-multimode-single-mode hybrid optical fibre structure

Tian, Ke; Farrell, Gerald; Wang, Xianfan; Yang, Wenlei; Xin, Yifan; Liang, Haidong; Lewis, Elfed; Wang, Pengfei

doi:10.1364/oe.25.018885

Cited by 60 publications

(24 citation statements)

References 25 publications

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“…In addition, SMS fibre structures have also been successfully developed as optical fibre sensors for a wide variety of measurements, e.g. temperature [6], strain [7], curvature [8], humidity [9], refractive index (RI) [10] and magnetic fields [11,12]. SMS fibre structures can be easily adapted for a wide range of different applications due to the versatility of their fabrication and the fact that all versions (variants) rely on a common underlying operation principle i.e.…”

Section: Introductionmentioning

confidence: 99%

High sensitivity temperature sensor based on singlemode-no-core-singlemode fibre structure and alcohol

Tian

Farrell²,

Wang

et al. 2018

Sensors and Actuators A: Physical

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A high sensitivity temperature sensor based on a singlemode-no-core-singlemode (SNCS) fibre structure and surrounded with alcohol within a silica capillary is described. In this investigation, no-core fibre (NCF) is used as the multimode waveguide and alcohol is chosen as the temperature sensitive medium. By packaging the alcohol solution with a short length of NCF enclosed within a silica capillary, the surrounding temperature can be detected by monitoring the variations of transmission loss at a specific wavelength. The theoretical analysis predicts this temperature sensor can provide high sensitivity, and the experimental results support this. The maximum temperature sensitivity of the sample is 0.49 dB/°C with a potential temperature resolution of 0.02°C at the operating wavelength of 1545.9 nm. In addition, the repeatability and response time of the sensor of this investigation are investigated experimentally.

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Section: Introductionmentioning

confidence: 99%

High sensitivity temperature sensor based on singlemode-no-core-singlemode fibre structure and alcohol

Tian

Farrell²,

Wang

et al. 2018

Sensors and Actuators A: Physical

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“…Due to cross sensitivity, most fiber optic MZI sensors are using to measure a single physical parameter, which cannot satisfy the requirement of simultaneously measurements of multiple parameters. Recently, many fiber-optic processing techniques have been combined with fiber-optic sensor, including tapering [27], etching [28], twisting [29], side-polishing [30] etc. The fiber-optic side polishing technique has been proved to be effectively improving sensing performance [30][31].…”

Section: Introductionmentioning

confidence: 99%

Investigation of a Side-Polished Fiber MZI and Its Sensing Performance

Zhang

Liu

et al. 2020

IEEE Sensors J.

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Abstract-A novel all-fiber Mach-Zehnder interferometer (MZI), which consists of lateral core fusion splicing of a short section of side-polished single mode fiber (SMF) between two SMFs was proposed and demonstrated. A simple fiber side-polished platform was built to control the side polished depth through a microscope. The sensitivity of the fiber MZI structure to the surrounding refractive index (RI) can be greatly improved with the increase of the side-polished depth, but has no effect on the temperature sensitivity. The sensor with a polished depth of 44.2 μm measured RI sensitivity up to -118.0 nm/RIU (RI unit) in the RI range from 1.333 to 1.387, which agrees well with simulation results by using the beam propagation method (BPM). In addition, the fiber MZI structure also can achieve simultaneous measurement of both RI and temperature. These results show its potential for use in-line fiber type sensing application.Index Terms-Fiber-optic, side-polished, Mach-Zehnder interferometer, refractive index (RI) Ping Zhang received the B.S. degree from Hefei Normal University in 2018. He is currently pursuing the M.S. degree in optical engineering with Nanchang Hangkong University. His current research interests include optical fiber sensing theory and technology.

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“…The SMS fibre structure is a very common fibre heterostructure which relies on MMI as its underling operating principle, and SMS fibre structures have been widely applied in telecommunications [13,14]. In the optical fibre sensing field, SMS fibre structures have also proven to be capable of performing measurements of a wide range of parameters, including temperature [15,16], humidity [17], displacement [18,19], curvature [20], strain [21,22], magnetic field [23] and RI [24][25][26] etc. A disadvantage of a simple SMS structure is that the cladding layer prevents direct access to the evanescent field by the external environment, thus traditional SMS fibre structures have not been used to directly measure external RI variations.…”

Section: Introductionmentioning

confidence: 99%

Temperature-insensitive refractometer based on an RI-modulated singlemode-multimode-singlemode fibre structure

et al. 2019

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A temperature-insensitive refractometer based on a refractive index (RI)modulated singlemode-multimode-singlemode (RMSMS) fibre structure is proposed and experimentally demonstrated. In this investigation, a combination of no-core fibre (NCF) and multimode fibre (MMF) regions provides an RI modulation region due to the difference in RI between the NCF and the MMF. In effect, by periodically embedding the NCF within the MMF section of a singlemode-multimode-singlemode (SMS) fibre structure, a long-period grating (LPG) can be effectively introduced in the MMF section, and the excited cladding modes are therefore able to sense surrounding RI variation. The modulation parameters are determined from the numerical simulations, and the experimental results show the maximum RI sensitivity of the fabricated sample is as high as 206.96 nm/RIU. In addition, the proposed RMSMS fibre structure is proven to be unaffected by external temperature variation (in the wavelength domain), which is a very attractive feature in practical sensing applications.

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Strain sensor based on gourd-shaped single-mode-multimode-single-mode hybrid optical fibre structure

Cited by 60 publications

References 25 publications

High sensitivity temperature sensor based on singlemode-no-core-singlemode fibre structure and alcohol

High sensitivity temperature sensor based on singlemode-no-core-singlemode fibre structure and alcohol

Investigation of a Side-Polished Fiber MZI and Its Sensing Performance

Temperature-insensitive refractometer based on an RI-modulated singlemode-multimode-singlemode fibre structure

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