Simultaneous measurement of refractive index and temperature based on half-tapered SMS fiber structure with fringe-visibility difference demodulation method

Hou, Liangtao; Zhang, Xudong; Yang, Jiuru; Kang, Jing; Ran, Lingling

doi:10.1016/j.optcom.2018.10.025

Cited by 38 publications

(10 citation statements)

References 24 publications

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“…Comparatively, in the range of 0-1100 µε, the intensity of Dip-1 merely has a fluctuation of ±0.63 dB, which is resulted from the power drift of light source in general [34]. Consequently, with the OSA resolution of 0.01 dB, the detecting resolution of strain is 1.62 µε.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Composite Modal Interferometer for Simultaneous Triple-Parameter Measurement Based on Cascaded No-Cladding Fiber and Thin-Core Fiber Structure

et al. 2020

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In this paper, an in-fiber composite modal interferometer (CMI) is proposed and experimentally demonstrated based on cascaded no-cladding fiber (NCF) and thin-core fiber (TCF) structure, which respectively corresponds to multimode interferometer (MMI) and Mach-Zehnder interferometer (MZI). The self-image effect of MMI is deeply analyzed and the interference fringes distribution of CMI is accurately designed by the selective the length of NCF and TCF. The comprehensive tests are then conducted and the experimental results show that interference fringes present similar temperature response but the apparent differences in strain and refractive index (RI) tests owing to the asymmetrical structure. MMI has a near-zero intensity sensitivity of strain and red-shifts with the increased RI. But MZI has the sensitivity of-19.3nm/RIU and a 4.94 dB increment in the range of 300-1100 με. Thus high-discrimination simultaneous triple-parameter measurement is achieved by means of joint wavelength and intensity demodulation. The proposed CMI has the merits of high sensitivity, low cost and ease of fabrication, and is very promising and potential for the engineering monitoring and sensing applications.

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Section: Experiments and Resultsmentioning

confidence: 99%

Composite Modal Interferometer for Simultaneous Triple-Parameter Measurement Based on Cascaded No-Cladding Fiber and Thin-Core Fiber Structure

et al. 2020

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“…Then, these modes cause mode-mode interference and leaked light recoupled back into the fiber resulting in specific pattern spectrum for sensing application. The axial propagation constant difference between m and n order core modes can be expressed as [ 46 ]

where

is the core radius of the taper waist, n core is the core effective refractive index of the waist, k is the wave number, µ m and µ n are normalized transverse propagation constants given by µ x = (2 x − 1/2) π /2. Constructive interference occurs when

where L is the length of waist, N is an integer, and the resonant wavelength can be derived from (1) and (2):

…”

Section: Methodsmentioning

confidence: 99%

A Taper-in-Taper Structured Interferometric Optical Fiber Sensor for Cu2+ ion Detection

Gong

Lei

Wang

et al. 2022

Sensors

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Copper ion is closely associated with the ecosystem and human health, and even a little excessive dose in drinking water may result in a range of health problems. However, it remains challenging to produce a highly sensitive, reliable, cost-effective and electromagnetic-interference interference-immune device to detect Cu2+ ion in drinking water. In this paper, a taper-in-taper fiber sensor was fabricated with high sensitivity by mode-mode interference and deposited polyelectrolyte layers for Cu2+ detection. We propose a new structure which forms a secondary taper in the middle of the single-mode fiber through two-arc discharge. Experimental results show that the newly developed fiber sensor possesses a sensitivity of 2741 nm/RIU in refractive index (RI), exhibits 3.7 times sensitivity enhancement when compared with traditional tapered fiber sensors. To apply this sensor in copper ions detection, the results present that when the concentration of Cu2+ is 0–0.1 mM, the sensitivity could reach 78.03 nm/mM. The taper-in-taper fiber sensor exhibits high sensitivity with good stability and mechanical strength which has great potential to be applied in the detection of low Cu2+ ions in some specific environments such as drinking water.

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“…8(n)) [171], waist-enlarged SMS fiber structures (Fig. 8(o-p)) [172][173], a spiral microstructure SMS [174], in-line tapers [175][176][177] and a side-polished fiber [178].…”

Section: E Combinations Of Sms Fiber Structuresmentioning

confidence: 99%

Singlemode-Multimode-Singlemode Fiber Structures for Sensing Applications—A Review

Liu

et al. 2021

IEEE Sensors J.

114

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A singlemode-multimode-singlemode (SMS) fiber structure consists of a short section of multimode fiber fusionspliced between two SMS fibers. The mechanism underpinning the operation of an SMS fiber structure is multimode interference and associated self-imaging. SMS structures can be used in a variety of optical fiber systems but are most commonly used as sensors for a variety of parameters, ranging from macro-world measurands such as temperature, strain, vibration, flow rate, RI and humidity to the micro-world with measurands such as proteins, pathogens, DNA, and specific molecules. While traditional SMS structures employ a short section of standard multimode fiber, a large number of structures have been investigated and demonstrated over the last decade involving the replacement of the multimode fiber section with alternatives such as a hollow core fiber or a tapered fiber. The objective of replacing the multimode fiber has most often been to allow sensing of different measurands or to improve sensitivity. In this paper, several different categories of SMS fiber structures, including traditional SMS, modified SMS and tapered SMS fiber structures are discussed with some theoretical underpinning and reviews of a wide variety of sensing examples and recent advances. The paper then summarizes and compares the performances of a variety of sensors which have been published under a number of headings. The paper concludes by considering the challenges faced by SMS based sensing schemes in terms of their deployment in real world applications and discusses possible future developments of SMS fiber sensors.

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Simultaneous measurement of refractive index and temperature based on half-tapered SMS fiber structure with fringe-visibility difference demodulation method

Cited by 38 publications

References 24 publications

Composite Modal Interferometer for Simultaneous Triple-Parameter Measurement Based on Cascaded No-Cladding Fiber and Thin-Core Fiber Structure

Composite Modal Interferometer for Simultaneous Triple-Parameter Measurement Based on Cascaded No-Cladding Fiber and Thin-Core Fiber Structure

A Taper-in-Taper Structured Interferometric Optical Fiber Sensor for Cu2+ ion Detection

Singlemode-Multimode-Singlemode Fiber Structures for Sensing Applications—A Review

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