A Humidity Sensor Based on a Whispering-Gallery-Mode Resonator With an L-shaped Open Microcavity

Wang, D. N.; Yan, Jing; Ge, Yunpeng; Guo, Yun; Xu, Bingjie

doi:10.1109/jlt.2021.3138737

Cited by 8 publications

(3 citation statements)

References 28 publications

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“…Moreover, the in-fiber resonator can work as a convenient sensing probe due to its reflection mode operation. Heretofore, it has been used in the sensing of temperature [ 50 , 53 ], humidity [ 84 ], hydrostatic pressure [ 78 ], refractive index [ 39 ], chemical vapor [ 81 ], biomolecule identity [ 28 , 85 ], etc. The sensing functions are realized by monitoring the change of WGM resonance.…”

Section: Discussionmentioning

confidence: 99%

“…As such, it is critical to design optical fibers with optimized microstructures and optical microsystems for high-efficiency coupling [ 86 – 90 ]. In addition, the multi-resonator based in-fiber resonator is a promising platform to study certain optical phenomena with profound physical significance [ 84 , 91 ], such as mode splitting [ 68 ], Vernier effect [ 92 ] and parity-time (PT) symmetry [ 93 ]. Specifically, mode splitting has been observed and utilized for displacement and temperature sensing with improved Q factor [ 40 , 94 ].…”

Section: Discussionmentioning

confidence: 99%

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Recent progress of in-fiber WGM microsphere resonator

Yang

Zhang

2023

Front. Optoelectron.

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In-fiber whispering gallery mode (WGM) microsphere resonators have received remarkable attention due to the superiorities of compact structure, high stability and self-alignment. As an in-fiber structure, WGM microsphere resonators have been demonstrated in various applications, such as sensors, filters and lasers, which have significant impacts on modern optics. Herein, we review recent progress of in-fiber WGM microsphere resonators, which involve fibers of diverse structures and microspheres of different materials. First, a brief introduction is given to in-fiber WGM microsphere resonators, from structures to applications. Then, we focus on recent progresses in this field, including in-fiber couplers based on conventional fibers, capillaries and micro-structure hollow fibers, and passive/active microspheres. Finally, future developments of the in-fiber WGM microsphere resonators are envisioned. Graphical Abstract

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Recent progress of in-fiber WGM microsphere resonator

Yang

Zhang

2023

Front. Optoelectron.

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“…The FPI is developed by using femtosecond (fs) laser to print a polymer microcantilever at the end of a single-mode fiber [9]. The complex sensing structure and post-coating process usually make the above sensing methods suffer from high cost, small yield and poor repeatability in batch production, which are not favorable for industrial production and commercial applications [12,13].…”

Section: Introductionmentioning

confidence: 99%

Humidity Sensing Using a Multimode Fiber Ring Laser with Thermal Compensation

Ma,

Ji,

Zhao

et al. 2024

Photonics

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We propose a multimode fiber laser sensor utilizing PI-SMF (polyimide-coated single mode fiber) for low-error relative humidity (RH) measurement, which is temperature compensated based on FBG. The PI-SMF in the laser cavity is used as a sensing element, and its length varies with humidity and temperature by volume-variation induced strain, which leads to frequency shift of the longitudinal mode beat frequency signal (BFS). When the 2000 MHz BFS is selected as the sensing signal, a RH sensitivity of −2.68 kHz/%RH and a temperature sensitivity of −14.05 kHz/°C are achieved. The peak shift of the FBG-based laser emission spectrum is only sensitive to temperature rather than RH with a temperature sensitivity of 9.95 pm/°C, which is used as the temperature compensation for RH measurements. By monitoring the response of the BFS and the laser wavelength, the cross-sensitivity effect of RH and temperature is overcome, and low-error RH measurement in the temperature range of 20 to 65 °C is realized with errors within ±0.67 %RH (25 to 85 %RH). The scheme does not require the design and production of complex structures and hygroscopic material coating processes, owning the advantages of simple structure, easy operation and high accuracy, and is expected to be practically applied in food safety and environmental monitoring.

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