Research on in-line MZI optical fiber salinity sensor based on few-mode fiber with core-offset structure

Zhang, Weihua; Wu, Meng-Ru; Jing, Lei; Tong, Zhengrong; Dong, Miaoyun; Tian, Xue; Yan, Gangxiao

doi:10.1016/j.measurement.2022.111857

Cited by 25 publications

(3 citation statements)

References 16 publications

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“…When the next fusion point is reached, they are coupled into the fiber core of SMF2 at the output end, thus constituting MZI. The sensing mechanism diagram is shown in Figure 3a, and the total light intensity transmitted to the output SMF end can be expressed as follows [29]:…”

Section: Principle Of Mzimentioning

confidence: 99%

Dual-Parameter Sensor for Temperature and Strain Measurement Based on Antiresonance Effect and Few-Mode Fiber

et al. 2023

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A simple and novel hybrid interferometer based on the antiresonance (AR) effect and Mach–Zehnder interference (MZI), which enables simultaneous measurement of temperature and strain, is proposed and investigated. The sensor is made by cascading a 30 cm section of a few-mode fiber (FMF) and a 3.376 mm hollow-core fiber (HCF) through a single-mode fiber (SMF). The FMF and SMF are fused without misalignment to excite two stable modes, thereby forming a Mach–Zehnder interferometer. Concurrently, the introduction of HCF can effectively excite the AR effect, which is manifested in the transmission spectrum as two different dips at the same time caused by the difference in the two physical mechanisms, showing diverse responses to both external temperature and strain. This difference can be used to construct a cross-coefficient matrix to implement the simultaneous measurement of temperature and strain. The experimental results demonstrate that the AR effect and MZI correspond to strain sensitivities of –0.87 and –2.29 pm/µε, respectively, and temperature sensitivities of 15.68 and –13.93 pm/°C, respectively. Furthermore, the sensor is also tested for repeatability, and the results show that it has good repeatability and great potential in sensing applications.

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Section: Principle Of Mzimentioning

confidence: 99%

Dual-Parameter Sensor for Temperature and Strain Measurement Based on Antiresonance Effect and Few-Mode Fiber

et al. 2023

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“…Through advanced optical fiber processing equipment and fabrication techniques, more and more special fiber structures are coming onto the stage of fiber sensing, such as tapered optical fiber (TOF) structure [ 17 ], D-shaped structure [ 24 ], U-shaped structure [ 25 ], S-shaped structure [ 26 ], fiber grating structure [ 27 ], heterocore structure [ 28 ], core-offset structure [ 29 , 30 ], and microsphere structure [ 31 ]. These special fiber structures can effectively excite the enhanced evanescent field and expose it to and interact with the surrounding medium, thus promoting the interaction between light and sensing materials and achieving higher sensing sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Advances in Tapered Optical Fiber Sensor Structures: From Conventional to Novel and Emerging

et al. 2023

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Optical fiber sensors based on tapered optical fiber (TOF) structure have attracted a considerable amount of attention from researchers due to the advantages of simple fabrication, high stability, and diverse structures, and have great potential for applications in many fields such as physics, chemistry, and biology. Compared with conventional optical fibers, TOF with their unique structural characteristics significantly improves the sensitivity and response speed of fiber-optic sensors and broadens the application range. This review presents an overview of the latest research status and characteristics of fiber-optic sensors and TOF sensors. Then, the working principle of TOF sensors, fabrication schemes of TOF structures, novel TOF structures in recent years, and the growing emerging application areas are described. Finally, the development trends and challenges of TOF sensors are prospected. The objective of this review is to convey novel perspectives and strategies for the performance optimization and design of TOF sensors based on fiber-optic sensing technologies.

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“…In order to increase the sensitivity of optical fiber sensors, various configurations of optical fiber sensors with offset core structures have been proposed [15,16]. The structure is spliced by the offset axis of the fiber core and the cladding, causing interference between the cladding mode and the core mode.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Measurement of Microdisplacement and Temperature Based on Balloon-Shaped Structure

Zhang,

Liu,

Huang

et al. 2023

Sensors

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An optical fiber sensor for the simultaneous measurement of microdisplacement and temperature based on balloon-shaped single-mode fibers cascaded with a fiber Bragg grating with two core-offset joints is proposed. The interference between the core mode and cladding mode is caused by the stimulation of the cladding mode by the core-offset joints’ structure. The cladding of the core has a distinct refractive index, which causes optical path differences and interference. The balloon-shaped structure realizes mode selection by bending. As the displacement increases, the radius of the balloon-shaped interferometer changes, resulting in a change in the interference fringes of the interferometer, while the Bragg wavelength of the fiber grating remains unchanged. Temperature changes will cause the interference fringes of the interferometer and the Bragg wavelength of the fiber grating to shift. The proposed optical fiber sensor allows for the simultaneous measurement of microdisplacement and temperature. The results of the experiment indicate that the sensitivity of the interferometer to microdisplacement is 0.306 nm/µm in the sensing range of 0 to 200 μm and that the temperature sensitivity is 0.165 nm/°C, respectively. The proposed curvature sensor has the advantages of a compact structure, extensive spectrum of dynamic measurement, high sensitivity, and simple preparation, and has a wide range of potential applications in the fields of structural safety monitoring, aviation industry, and resource exploration.

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Research on in-line MZI optical fiber salinity sensor based on few-mode fiber with core-offset structure

Cited by 25 publications

References 16 publications

Dual-Parameter Sensor for Temperature and Strain Measurement Based on Antiresonance Effect and Few-Mode Fiber

Dual-Parameter Sensor for Temperature and Strain Measurement Based on Antiresonance Effect and Few-Mode Fiber

Advances in Tapered Optical Fiber Sensor Structures: From Conventional to Novel and Emerging

Simultaneous Measurement of Microdisplacement and Temperature Based on Balloon-Shaped Structure

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