Ultra-sensitive seawater temperature sensor using an FBG-cascaded microfiber MZI operating at dispersion turning point

Xia, Feng; Zhao, Yong; Zheng, Hong-kun; Li, Li-ke; Tong, Rui-jie

doi:10.1016/j.optlastec.2020.106458

Cited by 35 publications

(5 citation statements)

References 16 publications

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“…The fast response, high reliability and small size are also the factors that have contributed to its popularity. Tapered fiber grating is formed by engraving a uniform FBG or long-period fiber grating (LPFG) on a taper fiber, that has unique spectral and dispersion characteristics [ 83 ]. The grating is cost-effective, and a single grating can achieve multiparameter measurements with higher accuracy and simplified sensor construction.…”

Section: Theoretical Mechanism For Sensingmentioning

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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Section: Theoretical Mechanism For Sensingmentioning

confidence: 99%

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

et al. 2023

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“…The sensitivity of this sensor can reach 10.389 nm/°C from 10 to 59.4 °C. In the same year, they tuned the cascaded structure to work at the dispersion turning point and very high temperature sensitivity of 38 nm/°C was reached within the temperature range of 2.28 °C to 38.38 °C ( Figure 1 f) [ 63 ].…”

Section: Ofss For Single-parameter Sensing and Measurement In Tspmentioning

confidence: 99%

“…( e ) The sensing probe with cascaded MZI and FBG [ 62 ]. ( f ) Schematic of temperature measurement system [ 63 ].…”

Section: Ofss For Single-parameter Sensing and Measurement In Tspmentioning

confidence: 99%

Review of Optical Fiber Sensors for Temperature, Salinity, and Pressure Sensing and Measurement in Seawater

Liang

Wang

Zhang

et al. 2022

Sensors

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Temperature, salinity, and pressure (TSP) are essential parameters for the ocean. Optical fiber sensors (OFSs) have rapidly come into focus as an ocean detection technology in recent years due to their advantages of electromagnetic interference, light weight, low cost, and no waterproof requirement. In this paper, the most recently developed TSP sensors for single parameter and multi-parameter TSP sensing and measurement based on different OFSs are reviewed. In addition, from the practical point of view, encapsulation methods that protect fibers and maintain the normal operation of OFSs in seawater, and the response time of the OFS, are addressed. Finally, we discuss the prospects and challenges of OFSs used in marine environments and provide some clues for future work.

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“…Recently, several approaches for fiber sensors have been proposed to enable multiparameter sensing [34]. Such as spatial division multiplexing (SDM) [35], temporal division multiplexing (TDM) [36], and spatial frequency division multiplexing (SFDM) [37].…”

Section: Introductionmentioning

confidence: 99%

Wide-range pH sensor based on a cascaded MZI up-down tapered hetero-core structure

Hussein Mahmood,

Kadhim Al-Hayali,

Al-Janabi

2024

Appl. Opt.

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In this paper, we describe the first demonstration of an optical fiber sensor based on two cascaded architectures of the Mach–Zehnder interferometer (MZI) with an up-down-tapered (UDT) hetero-core fiber structure for simultaneous pH measurement at two different spatial locations. The two fiber structures, namely structures I and II, were fabricated by sandwiching a 45 mm and 60 mm long piece of no-core fiber (NCF) between two single-mode fibers (SMFs), respectively. By inserting a down-taper between two adjacent up-tapers in the NCF section using the over-fusion splicing technique, the UDT hetero-core fiber structure was achieved. The down-taper works as an optical attenuator, while the two up-tapers each function as a fiber splitter/combiner. By cascading the two sensor structures I and II, two distinct interference dips were obtained, resulting in dual sensing points (so-called sensing points I and II). According to experimental results, it was shown that the proposed sensing points I and II are pH-sensitive, and exhibit sensitivities of 1.0428 nm/pH and −1.7857nm/pH for simultaneous measurement for each point as the pH ranged from 8 to 14 and from 1 to 7 pH, respectively. The obtained results show that the proposed dual point pH sensor has the potential to be used for the simultaneous detection of pH parameters in any environment and at various places.

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Ultra-sensitive seawater temperature sensor using an FBG-cascaded microfiber MZI operating at dispersion turning point

Cited by 35 publications

References 16 publications

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

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

Review of Optical Fiber Sensors for Temperature, Salinity, and Pressure Sensing and Measurement in Seawater

Wide-range pH sensor based on a cascaded MZI up-down tapered hetero-core structure

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