Optical fiber refractive index sensor based on SMF-TCF-NCF-SMF interference structure

Zheng, Yuanyuan; Yang, Xiaozhan; Feng, Wenlin; Fan, Wei

doi:10.1016/j.ijleo.2020.165900

Cited by 15 publications

(4 citation statements)

References 22 publications

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“…At this time, the energy of the light field is the same as that of the incident light field, the intensity of the light field is the largest, and the light energy is the strongest. 18 Further, the length of the NCF is analyzed. Considering the integration and portability of the sensor, the light field effects of the NCF lengths of 15, 20, and 25 mm were simulated and analyzed, as shown in Figure 2A-C, separately.…”

Section: Sensing Unit Preparationmentioning

confidence: 99%

“…First, through simulation analysis, it is found that when the MMF length is 5 mm, the light field distribution produces a self‐imaging effect (Figure 2A). At this time, the energy of the light field is the same as that of the incident light field, the intensity of the light field is the largest, and the light energy is the strongest 18 . Further, the length of the NCF is analyzed.…”

Section: Sensing Unit Preparationmentioning

confidence: 99%

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Fiber optic sensor for transformer temperature detection

Shen

Yuan

Chen

et al. 2023

Micro & Optical Tech Letters

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The safe and stable operation of the transformer is affected by the internal temperature. Therefore, it is very necessary to accurately and effectively detect the temperature of the transformer winding. To realize the effective detection of the internal temperature of the transformer, a fiber optic temperature sensor based on the structure of multimode fiber (MMF)–no core fiber (NCF)–multimode fiber (MMF) (i.e., MMF–NCF–MMF) is studied. The temperature sensitivity reaches 0.0313 nm/°C. Moreover, to enhance the accuracy of the test, the sensitive material polydimethylsiloxane (PDMS) is coated on the sensing area (the position of the NCF), and its temperature sensitivity reaches 0.123 nm/°C. By comparison, it was found that the temperature detection sensitivity increased by 3.93 times after coating PDMS. The sensor has the characteristics of simple structure, high sensitivity, and high integration, which provides research and application directions for temperature detection in the field of transformer health detection.

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Section: Sensing Unit Preparationmentioning

confidence: 99%

Section: Sensing Unit Preparationmentioning

confidence: 99%

Fiber optic sensor for transformer temperature detection

Shen

Yuan

Chen

et al. 2023

Micro & Optical Tech Letters

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show abstract

“…When ∆ n eff L = n co − n m cl , the FSR decreases with an increase in L. During temperature measurement, the position of the interference spectrum changes significantly under the action of the thermal light coefficient and thermal expansion coefficient, and it can be expressed as follows [31]:…”

Section: Sensing Principle and Simulationmentioning

confidence: 99%

Simultaneous Measurement of Curvature and Temperature Based on a Simple Cascaded Fiber Interferometer

Wang¹,

Lu²,

Liu³

2022

PIER M

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An optical fiber sensor based on thin-core fiber (TCF) and no-core fiber (NCF) interference structures is presented and experimentally demonstrated to measure the curvature and temperature. The fabrication process of the sensor is simple and convenient, and the sensing part is formed by cascading a TCF and an NCF between two single-mode fibers. The dips at resonant wavelengths are generated in the optical transmission spectrum owing to mode interference. The experimental results indicate that an optical curvature sensitivity of −5.76 nm/m −1 is achieved in the linear range of 0.9895-3.2817 m −1 and that a temperature sensitivity of 0.18 nm/ • C is obtained in the temperature range of 25-55 • C. Additionally, the cross sensitivity problem is solved using the coefficient matrix measurement method, and the cross-sensitivity is as low as 0.0312 m −1 / • C. Therefore, the sensor exhibits a highly reproducible technique and low cross sensitivity, which has a wide range of application prospects in the accurate measurement of mechanical arms and structural health monitoring.

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“…Nowadays, other optical fiber types have also been used to develop RI optical sensors such as photonic crystal fiber [11][12][13], no core fiber [14,15] and plastic optical fiber (POF) [16]. However, mechanical treatments such as etching and tapering which are commonly implemented in modifying the optical fiber structure for sensor application, may degrade the fiber's strength.…”

Section: Introductionmentioning

confidence: 99%

Unsaturated polyester resin/polymethylmethacrylate waveguide-based refractive index sensor with dual-wavelength temperature compensation

Yulianti

Marwoto

Astuti

et al. 2023

Meas. Sci. Technol.

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This paper demonstrates an optical waveguide based- refractive index (RI) sensor using temperature compensation method. The optical waveguide was formed using a polymethylmethacrylate (PMMA) sheet as the cladding material and unsaturated polyester resin (UPR) as the core material. The sensor design consists of two input waveguide branches, a sensing area and an output branch. Two light emitting diodes (LEDs) with wavelength of 530 nm and 660 nm were used as light sources. In this work, temperature compensation was done by dual-wavelength technique in which RI and temperature sensitivities were measured at two different wavelengths at 530nm and 660nm. Based on the RI and temperature sensitivities, temperature compensation was implemented. Experimental findings indicated that the average relative error of the uncompensated measurement using the light source of 530nm and 660nm were 0.4372% and 0.2749 %, respectively. Meanwhile, the average error of the temperature compensation method was 0.0344 %. Hence, the temperature compensation method provides measurement error up to 92% lower compared to the uncompensated method. As such, the proposed dual-wavelength compensation method could effectively improve the RI measurement accuracy.Keywords: Optical waveguide, polymethylmethacrylate, polyester resin, refractive index sensor, dual-wavelength, temperature compensation

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Optical fiber refractive index sensor based on SMF-TCF-NCF-SMF interference structure

Cited by 15 publications

References 22 publications

Fiber optic sensor for transformer temperature detection

Fiber optic sensor for transformer temperature detection

Simultaneous Measurement of Curvature and Temperature Based on a Simple Cascaded Fiber Interferometer

Unsaturated polyester resin/polymethylmethacrylate waveguide-based refractive index sensor with dual-wavelength temperature compensation

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