Highly Sensitive Tapered Fiber Mach–Zehnder Interferometer for Liquid Level Sensing

Hsu, Jui‐Ming; Lee, Cheng‐Ling; Chang, Hun-Pin; Shih, Wen Cheng; Li, Chai-Ming

doi:10.1109/lpt.2013.2265738

Cited by 35 publications

(8 citation statements)

References 15 publications

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“…Single parameter measurement was pioneered in [31,32], where the RI and strain were quantified. The following works also achieved curvature [33], lateral stress [34], liquid level [35], and enhanced sensitivity for RI [36] measurements. The aforementioned measurements all employed the widely used peak wavelength shift method, which could be not practical when there is only small difference between the two spectra.…”

Section: Short Tapermentioning

confidence: 99%

Recent Developments in Micro-Structured Fiber Optic Sensors

Chen

et al. 2017

Fibers

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Recent developments in fiber-optic sensing have involved booming research in the design and manufacturing of novel micro-structured optical fiber devices. From the conventional tapered fiber architectures to the novel micro-machined devices by advanced laser systems, thousands of micro-structured fiber-optic sensors have been proposed and fabricated for applications in measuring temperature, strain, refractive index (RI), electric current, displacement, bending, acceleration, force, rotation, acoustic, and magnetic field. The renowned and unparalleled merits of sensors-based micro-machined optical fibers including small footprint, light weight, immunity to electromagnetic interferences, durability to harsh environment, capability of remote control, and flexibility of directly embedding into the structured system have placed them in highly demand for practical use in diverse industries. With the rapid advancement in micro-technology, micro-structured fiber sensors have benefitted from the trends of possessing high performance, versatilities and spatial miniaturization. Here, we comprehensively review the recent progress in the micro-structured fiber-optic sensors with a variety of architectures regarding their fabrications, waveguide properties and sensing applications.

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Section: Short Tapermentioning

confidence: 99%

Recent Developments in Micro-Structured Fiber Optic Sensors

Chen

et al. 2017

Fibers

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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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“…For example, optical interference signals do not travel in free space and are not affected by the weather and electromagnetic waves. In the literature, the development of all-fiber interferometers with different configurations has yielded considerable results, such as fiber-optic Michelson interferometers (FMI) [1,2,3,4], fiber-optic Mach–Zehnder interferometers (FMZI) [5,6,7,8], fiber-optic Fabry–Perot interferometers (FFPI) [9,10,11,12,13,14,15,16,17], and fiber-optic Fizeau interferometers (FFI) [18,19]. Typical FI based sensing systems and application examples have been categorized into 13 types, according to the measured parameters, i.e., temperature [20,21], mechanical vibration [22,23], acoustic wave [22,24], ultrasound [25,26], voltage [27,28], magnetic field [29,30], pressure [20,31], strain [21,32], flow velocity [33,34], humidity [35,36], gas [37,38], liquid level [39,40], and the refractive index (RI) [41,42].…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of a Novel Measuring Scheme for Fiber Interferometer Based Sensors

Lee

You

2019

Sensors

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This paper presents a novel measuring scheme for fiber interferometer (FI) based sensors. With the advantages of being small sizes, having high sensitivity, a simple structure, good durability, being easy to integrate fiber optic communication and having immunity to electromagnetic interference (EMI), FI based sensing devices are suitable for monitoring remote system states or variations in physical parameters. However, the sensing mechanism for the interference spectrum shift of FI based sensors requires expensive equipment, such as a broadband light source (BLS) and an optical spectrum analyzer (OSA). This has strongly handicapped their wide application in practice. To solve this problem, we have, for the first time, proposed a smart measuring scheme, in which a commercial laser diode (LD) and a photodetector (PD) are used to detect the equivalent changes of optical power corresponding to the variation in measuring parameters, and a signal processing system is used to analyze the optical power changes and to determine the spectrum shifts. To demonstrate the proposed scheme, a sensing device on polymer microcavity fiber Fizeau interferometer (PMCFFI) is taken as an example for constructing a measuring system capable of long-distance monitoring of the temperature and relative humidity. In this paper, theoretical analysis and fundamental tests have been carried out. Typical results are presented to verify the feasibility and effectiveness of the proposed measuring scheme, smartly converting the interference spectrum shifts of an FI sensing device into the corresponding variations of voltage signals. With many attractive features, e.g., simplicity, low cost, and reliable remote-monitoring, the proposed scheme is very suitable for practical applications.

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Highly Sensitive Tapered Fiber Mach–Zehnder Interferometer for Liquid Level Sensing

Cited by 35 publications

References 15 publications

Recent Developments in Micro-Structured Fiber Optic Sensors

Recent Developments in Micro-Structured Fiber Optic Sensors

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

Design and Implementation of a Novel Measuring Scheme for Fiber Interferometer Based Sensors

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