Simultaneous measurement of refractive index and temperature based on a core-offset Mach–Zehnder interferometer combined with a fiber Bragg grating

Yao, Qiqi; Meng, Hongyun; Wang, Wei; Xue, Hongchao; Xiong, Rui; Huang, Ben; Tan, Chunhua; Huang, Xuguang

doi:10.1016/j.sna.2014.01.017

Cited by 148 publications

(42 citation statements)

References 19 publications

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“…In the past, several different fibre optic sensors have been designed to simultaneously measure pressure and RI or temperature and RI. For instance, to determine temperature and RI simultaneously several different systems such as a partially cone-shaped Fibre Bragg Grating (FBG) [7], an in-line Mach-Zehnder Interferometer (MZI) embedded in a FBG [8], a core-offset MZI combined with a FBG [9] or a Long Period Grating (LPG) based MZI [10] have been reported. Also a fibre optic sensor based on a SU-8 sensor tip [11], a dual-cavity Fabry-Perot Interferometer (FPI) [12][13] or a temperature-insensitive FPI relying on a photonic-crystal fibre [14] have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Pressure, temperature and refractive index determination of fluids using a single fibre optic point sensor

Bremer

Reinsch

Leen

et al. 2017

Sensors and Actuators A: Physical

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The accurate determination of physico-chemical fluid parameters is of major importance in many process engineering applications. Not only the monitoring of the phase distribution in piping systems but also the detection of chemical concentrations in liquids is of interest for an efficient, safe and reliable operation of laboratory as well as industry scale applications. In this paper, we present a miniature all-silica fiber optic sensor capable of measuring pressure, temperature and refractive index of a fluid at a single point simultaneously. In future, such a sensor can be utilized in applications, where these quantities and, hence, phase composition or chemical concentration have to be monitored possibly under harsh environments such as geothermal or oil drilling wells.

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Section: Introductionmentioning

confidence: 99%

Pressure, temperature and refractive index determination of fluids using a single fibre optic point sensor

Bremer

Reinsch

Leen

et al. 2017

Sensors and Actuators A: Physical

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“…Diverse MachZehnder interferometers are constructed using structures such as core offset [3,4], tapered fiber [5], and multimode microfiber [6] for simultaneous measurement of temperature and RI. Various configurations of MZI combined with fiber Bragg grating have also been explored to measure ambient This refractive index and temperature simultaneously, including peanut-shape and core-offset structure [7], and only coreoffset MZI [8]. Formation of MZI has also been illustrated using a pair of long period gratings [9] and splicing a piece of photonic crystal fiber between single mode fibers [10].…”

Section: Introductionmentioning

confidence: 99%

Bragg Grating Embedded in Mach-Zehnder Interferometer for Refractive Index and Temperature Sensing

Ahmed

Ahsani

Saad

et al. 2016

IEEE Photon. Technol. Lett.

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Abstract-Fiber Bragg grating (FBG) embedded in a microfiber Mach-Zehnder interferometer (MZI) is presented for sensing multi-parameters such as temperature and refractive index. The MZI is constructed by splicing a short length of 40 µm diameter microfiber between standard single mode fibers. A millimeter long FBG is then written in the microfiber using direct point-by-point ultrafast laser inscription method. The microfiber MZI shows moderate sensitivity to ambient refractive index and temperature changes. In contrast, the microfiber FBG is insensitive to ambient refractive index change while it exhibits typical sensitivity to temperature variation. These distinct characteristics of the FBG and MZI sensors enable simultaneous measurement of refractive index and temperature, and temperature compensation in ambient refractive index measurement.Index Terms-Miniature microfiber Mach-Zehnder interferometer, microfiber Bragg grating, ultrafast laser inscription, simultaneous temperature and refractive index measurement, temperature compensated refractive index measurement.

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“…In this paper, a HOMF-based fiber modal interferometer supporting three dominant modes is achieved with distinct chromatic dispersion of each guided mode and intermodal dispersion. Compared to conventional multimode interference structures (SMF-multimode-SMF structures, taper or lateral-offset in fiber Mach-Zehnder interferometers [23][24][25][26][27][28][29][30][31][32][33][34][35]) with a great amount of high-order optical modes, the proposed HOMF modal interferometer supports only a few steady core-guided modes which only need to be calibrated once for sensing response which is essential for practical applications. Thus the HOMF-based sensor here could be deployed for highly accurate discrimination based on the precise dispersion measurement and analysis on intermodal coupling with a novel phase demodulation scheme.…”

Section: Introductionmentioning

confidence: 99%

Dispersion effects of high-order-mode fiber on temperature and axial strain discrimination

Song

et al. 2015

Photonic Sens

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Abstract:A new approach utilizing effects of dispersion in the high-order-mode fibers (HOMFs) to effectively discriminate changes in environmental temperature and axial strain is proposed and experimentally demonstrated. Experimental characterization of a HOMF-based fiber modal interferometer with a sandwich fiber structure exhibits excellent agreements with numerical simulation results. A Fourier transform method of interferometry in the spatial frequency domain is adopted to distinguish mode coupling between different core-guided modes. Distinct phase sensitivities of multiple dispersion peaks are extracted by employing a novel phase demodulation scheme to realize dual-parameter sensing.

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Simultaneous measurement of refractive index and temperature based on a core-offset Mach–Zehnder interferometer combined with a fiber Bragg grating

Cited by 148 publications

References 19 publications

Pressure, temperature and refractive index determination of fluids using a single fibre optic point sensor

Pressure, temperature and refractive index determination of fluids using a single fibre optic point sensor

Bragg Grating Embedded in Mach-Zehnder Interferometer for Refractive Index and Temperature Sensing

Dispersion effects of high-order-mode fiber on temperature and axial strain discrimination

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