Refractive index and temperature optical fiber sensor based on thin core S-taper and spherical structure

Yang, Fan; Cao, Ye; Li, Meiqi; Ju, Hui; Li, Lijun

doi:10.1007/s11801-022-1153-3

Optoelectron. Lett.

2022

DOI: 10.1007/s11801-022-1153-3

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Refractive index and temperature optical fiber sensor based on thin core S-taper and spherical structure

Fan Yang

Ye Cao

Meiqi Li

et al.

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Cited by 3 publications

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“…So far, RI resolutions of mFBG, LPG and microfibers Sagnac loop sensors usually can get 10 −2 −10 −3 , 10 −3 −10 −4 and 10 −5 −10 −6 , respectively. Meanwhile, the RI resolution of other optical fiber sensors (such as special fiber structure [14], taper fiber structure [15], and FBG [16] and other structures [17,18]) are always lower than 10 −5 . The main reason of microfiber Sagnac loop sensor presents more higher RI resolution than others is due to higher order cladding modes can be excited by the microfibers with micrometer diameter.…”

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confidence: 99%

High stability microfiber Sagnac loop liquid refractive index sensor with FBG mode selecting

Li¹,

Jia²,

Xu³

et al. 2022

J. Inst.

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As a high-resolution sensor, it is very important to improve the spectral stability of microfiber Sagnac loop interferometer. A fiber Bragg grating (FBG) mode selecting method is proposed and demonstrated. The method can filter out some cladding modes by FBG in the Sagnac loop and make working modes energy more concentrated, which shows that the interference spectrum becomes more uniform. At the same time, the sensitivity and linearity of the sensor can be improved slightly by this method. In our experiment, the resolution of sensor can get 1.41 × 10-5 ∼ 7.49 × 10-6 in the liquid refractive index range of 1.3330∼1.38481. Moreover, this method can effectively improve the spectral stability of the interferometer, which shows that the dip wavelength absolute error of time fluctuation is improved from ±0.358 nm to 0.021 nm and from ±0.116 nm to 0.000 nm at 1536.6 nm and 1559.9 nm initial dip wavelength, respectively. This method also has advantages of compact structure, good mechanical properties, and easy preparation. On this basis, the FBG also can be replaced by various modes filters to develop more multifunctional high stability interferometers according to the detection needs.

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confidence: 99%

High stability microfiber Sagnac loop liquid refractive index sensor with FBG mode selecting

Li¹,

Jia²,

Xu³

et al. 2022

J. Inst.

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A biological fluid fiber Sagnac sensor based on SPF-PCF-SPF structure

Guo

Wang

et al. 2023

Optoelectron. Lett.

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Optical Vernier sensor based on a cascaded tapered thin-core microfiber for highly sensitive refractive index sensing

chen¹,

Luo²,

Wu³

et al. 2022

Appl. Opt.

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This study proposes a refractive index (RI) sensor using a cascaded tapered thin-core microfiber (TTCMF) based on the Vernier effect. The thin-core fiber was made into a TTCMF by arc discharging and flame heating and then sandwiched between two single-mode fibers (SMFs). The two structures with the same SMF–TTCMF–SMF but slightly different free spectral ranges (FSRs) were cascaded to generate the Vernier effect. The FSR varied with the taper parameters of TTCMF. The RI sensitivities of a single TTCMF sensor, series SMF–TTCMF–SMF sensor, and parallel SMF–TTCMF–SMF sensor were compared and analyzed. Using the Vernier effect in the RI measurement range from 1.3313 to 1.3392, a very high RI sensitivity of − 15 , 053.411 n m / R I U was obtained using the series SMF–TTCMF–SMF structure, and − 16 , 723.243 n m / R I U using the parallel structure, which were basically consistent with the simulation results. Compared with the RI sensitivity of the single TTCMF sensor, the RI sensitivities of series and parallel sensors were increased by 4.65 times and 5.16 times, respectively. In addition, in the temperature range from 35°C to 65°C, temperature sensitivities of − 0.196 n m / ∘ C and − 0.0489 n m / ∘ C were obtained using series and parallel structures, respectively; the corresponding temperature cross errors were 1.302 × 10 − 5 R I U / ∘ C and 2.92 × 10 − 6 R I U / ∘ C , respectively. Based on the advantages of high RI sensitivity, simple structure, low-temperature cross sensitivity, and convenient fabrication, the proposed sensors have great potential in biosensing fields.

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Refractive index and temperature optical fiber sensor based on thin core S-taper and spherical structure

Cited by 3 publications

References 16 publications

High stability microfiber Sagnac loop liquid refractive index sensor with FBG mode selecting

High stability microfiber Sagnac loop liquid refractive index sensor with FBG mode selecting

A biological fluid fiber Sagnac sensor based on SPF-PCF-SPF structure

Optical Vernier sensor based on a cascaded tapered thin-core microfiber for highly sensitive refractive index sensing

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