Temperature insensitive salinity sensor with U-shaped structure based on few-mode fiber

Zhang, Weihua; Wu, Meng-Ru; Wang, Xue; Tong, Zhengrong; Dong, Miaoyun; Yan, Gangxiao

doi:10.1016/j.yofte.2022.103218

Cited by 7 publications

(3 citation statements)

References 20 publications

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“…Additionally, using a spectrum interrogator to demodulate the intensity is also another effective approach. U-shaped tapered fiber 0.115 0.068 [31] U-shaped few-mode fiber ~ 0.185 [32] SPR-MZI 0.317 0.429 [33] Semi-Open Cavity 1.280 0.309 [34] balloon shaped SMF 0.735 0.168 This work tPMF-Sagnac loop 0.616 0.356…”

Section: Resultsmentioning

confidence: 93%

Dual-Parameter Fiber Sensors for Salinity and Temperature Measurement Based on a Tapered PMF Incorporated With an FBG in Sagnac Loop

Liu,

Lin,

Zhao

et al. 2024

IEEE Photonics J.

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A flexible and stable optical fiber sensor based on the Sagnac loop is proposed and experimentally demonstrated for the measurement of salinity and temperature, simultaneously. The sensing unit consists of a tapered polarization maintaining fiber (tPMF) and a fiber Bragg grating (FBG) connected in series in the Sagnac loop. The temperature response comes from the high birefringence of PMF inside Sagnac loop, and the salinity response is enabled by the high-order modes excited in the tapered area of PMF. Besides, the FBG is for temperature compensation. We have succeeded in implementing dual-parameter measurements with the sensitivities of 0.356 nm/‰ for salinity and 0.616 nm/°C for temperature, respectively. The designed sensor has the potential for long-term monitoring of real ocean states.

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Section: Resultsmentioning

confidence: 93%

Dual-Parameter Fiber Sensors for Salinity and Temperature Measurement Based on a Tapered PMF Incorporated With an FBG in Sagnac Loop

Liu,

Lin,

Zhao

et al. 2024

IEEE Photonics J.

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“…When the refractive index of the external environment changes, ∆n t eff changes, resulting in a change in ∆ϕ i , which further creates a shift in the interference spectrum. The wavelength shift in the interference spectrum (λ dip ) with the change in the external refractive index (n s ) can be expressed as follows [27]:…”

Section: Preparation and Working Principlementioning

confidence: 99%

Tapered Fiber Bioprobe Based on U-Shaped Fiber Transmission for Immunoassay

Chen,

Xiao,

et al. 2023

Biosensors

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In this paper, a tapered fiber bioprobe based on Mach–Zehnder interference (MZI) is proposed. To retain the highly sensitive straight-tapered fiber MZI sensing structure, we designed a U-shaped transmission fiber structure for the collection of optical sensing signals to achieve a miniature-insert-probe design. The spectrum responses from the conventional straight-tapered fiber MZI sensor and our proposed sensor were compared and analyzed, and experimental results showed that our proposed sensor not only has the same sensing capability as the straight-tapered fiber sensor, but also has the advantages of being flexible, convenient, and less liquid-consuming, which are attributed to the inserted probe design. The tapered fiber bioprobe obtained a sensitivity of 1611.27 nm/RIU in the refractive index detection range of 1.3326–1.3414. Finally, immunoassays for different concentrations of human immunoglobulin G were achieved with the tapered fiber bioprobe through surface functionalization, and the detection limit was 45 ng/mL. Our tapered fiber bioprobe has the insert-probe advantages of simpleness, convenience, and fast operation. Simultaneously, it is low-cost, highly sensitive, and has a low detection limit, which means it has potential applications in immunoassays and early medical diagnosis.

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“…The earth's surface has approximately 75% of ocean and seawater. Water salinity is not only important in the study of the circulation of the ocean, and marine fishery [1] [2], but it is also one of the most essential and critical physical parameters of the ocean [3]. Both, theoretical calculation and practical measurement of the salinity of seawater are very critical for the marine environment [3], [4], ecological pollution control, agriculture field, human health, crops and industry [5].…”

Section: Introductionmentioning

confidence: 99%

Optofluidic sensor for measuring water salinity

Shafaay

Ghanim

Kreta

et al. 2023

Optical Sensors 2023

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Water salinity analysis is critical for water quality monitoring and evaluation in order to guarantee water safety. Unregulated salinity may be harmful to human health, crops, industry, and the ecosystem. The salinity levels in water sources are constantly changing as a result of natural and anthropogenic ecological change. Exceeding specific salt levels might endanger human health, particularly through drinkable water. In this work, we present a simulation of an optofluidic sensor to measure the water's salinity. We built a design to measure the change in the refractive index in a microfluidic channel based on the dielectric grating. The generated design was modelled to alleviate the manufacturing process of the microfluidic sensor of the saline water. The design was optimized for the range of measurements of the refractive index of saline water by the selection of the material of the sensor.

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Temperature insensitive salinity sensor with U-shaped structure based on few-mode fiber

Cited by 7 publications

References 20 publications

Dual-Parameter Fiber Sensors for Salinity and Temperature Measurement Based on a Tapered PMF Incorporated With an FBG in Sagnac Loop

Dual-Parameter Fiber Sensors for Salinity and Temperature Measurement Based on a Tapered PMF Incorporated With an FBG in Sagnac Loop

Tapered Fiber Bioprobe Based on U-Shaped Fiber Transmission for Immunoassay

Optofluidic sensor for measuring water salinity

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