A High-Temperature Humidity Sensor Based on a Singlemode-Side Polished Multimode-Singlemode Fiber Structure

Wang, Xianfan; Tian, Ke; Yuan, Libo; Lewis, Elfed; Farrell, Gerald; Wang, Pengfei

doi:10.1109/jlt.2018.2815955

Cited by 29 publications

(17 citation statements)

References 30 publications

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“…A tapered SMS fiber structure can also be used for strain [196] and acoustic sensing [197]. The MMF section can also possess an elliptical cross section [198], a bent shape [199] or be side polished [200] etc.…”

Section: A a Tapered Sms Fiber Structurementioning

confidence: 99%

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

Liu

et al. 2021

IEEE Sensors J.

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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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Section: A a Tapered Sms Fiber Structurementioning

confidence: 99%

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

Liu

et al. 2021

IEEE Sensors J.

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“…Recent interest in the study of optical fiber structures with insertions of special fibers is due to the possibility of exciting cladding modes and using them in fiber-optic sensors [ 1 , 2 , 3 ]. Such structures can be highly sensitive to environmental parameters such as temperature [ 4 ], humidity [ 5 ], liquid level [ 6 , 7 ], etc. Some systems with fiber insertions are capable of gas sensing [ 8 ] and chemical sensing [ 9 ]; for example, they can determine the concentration of ethyl alcohol [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Control of Excitation of Cladding Modes by Tapering an Insertion of Special Fiber

Bakurov

Иванов

2021

Sensors

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A method for controlling the excitation of cladding modes by tapering special fiber insertions made of SM450 and coreless fibers is proposed. The coupling coefficients between the core mode and the cladding modes of the tapered fiber insertion are calculated. For the calculation, changes in the effective refractive indices and phases of the fiber core and in the cladding modes upon tapering are found. The field distribution of the core mode of the standard fiber transmitted through fiber insertion is obtained. The transmission characteristics of insertions of SM450 and coreless fibers during tapering are simulated and compared with the experiment. The possibility of controlling the transmission and excitation of various cladding modes is confirmed experimentally.

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“…Among these optical fiber sensors, optical fiber MZI sensor has unique advantages such as high sensitivity, ease of fabrication, and all-fiber structure [16]. Therefore, optical fiber MZI sensors are used in a variety of applications, not only for temperature measurement [17,18], but also measurements of RI, liquid level, strain, curvature, humidity and other parameters [19][20][21][22][23][24]. Optical fiber sensors have obvious advantages such as simple fabrication, label-free sensing [25,26].…”

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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A High-Temperature Humidity Sensor Based on a Singlemode-Side Polished Multimode-Singlemode Fiber Structure

Cited by 29 publications

References 30 publications

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

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

Control of Excitation of Cladding Modes by Tapering an Insertion of Special Fiber

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

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