Ultrasensitive fiber-optic temperature sensor based on cascaded Sagnac interferometers with a nematic liquid crystal film

Fan, Xiaoya; Chen, Hailiang; Zheng, Yu; Liu, Yundong; Chen, Qiang; Zhang, Yingyue; Ma, Mengdong; Li, Shuguang; Shum, Perry Ping

doi:10.1016/j.optlastec.2022.108169

Cited by 32 publications

(5 citation statements)

References 15 publications

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“…where the sensitivity S W is the ratio of ∆λ dip which represents the movement of the valleys in the interference spectrum and ∆E represents the change in external physical quantities. The resolution is also an important metric to judge the performance of a sensor, which can be expressed as [37]…”

Section: Resultsmentioning

confidence: 99%

Paralleled Sagnac interferometer and Mach–Zehnder interferometer for enhanced measurements sensitivity based on Vernier effect

Shi,

Chen,

et al. 2024

J. Phys. D: Appl. Phys.

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In this paper, Vernier effect (VE) was experimentally excited through paralleling Sagnac interferometer (SI) and Mach-Zehnder interferometer (MZI). SI was fabricated by a 38 cm long panda-shaped polarization maintaining fiber (PMF) in the Sagnac loop, while MZI was made through pulling single mode fiber (SMF) into a tapered type fiber. The strain and temperature sensitivities of the paralleled SI and MZI were 51.97 pm/με and 2.94 nm/℃ respectively, which were increased approximately 3 times than an individual SI whose measurement sensitivities of strain and temperature were 18.24 pm/με and 0.98 nm/℃ correspondingly. The theoretical analysis of the single interference and paralleled interferences were verified by the experimental results. The proposed sensor shows simple in fabrication, high sensitivity, and good hysteresis, is a strong competitor in monitoring the strain and temperature.

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Section: Resultsmentioning

confidence: 99%

Paralleled Sagnac interferometer and Mach–Zehnder interferometer for enhanced measurements sensitivity based on Vernier effect

Shi,

Chen,

et al. 2024

J. Phys. D: Appl. Phys.

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“…However, there was only one central peak here, proving that interference between the cladding and the core mode predominates. The spatial spectrum's dominant frequency peak corresponds to the transmission spectrum's FSR [24].…”

Section: Measurement Of Glucose Concentration Based On a Single Mzimentioning

confidence: 99%

Ultra-sensitive fiber optic sensor for glucose concentration measurement based on Vernier effect in cascaded Mach–Zehnder interferometers

Zhang,

Chen,

Fan

et al. 2024

J. Phys. D: Appl. Phys.

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In this paper, a fiber optic glucose concentration sensor based on cascaded Mach-Zehnder interferometers (CMZIs) was proposed and experimentally verified. Two single-mode fibers (SMFs) with slightly different tapering lengths and as well free spectral ranges (FSRs) were obtained through the melt-drawn cones technique and then were cascaded together to achieve the vernier effect (VE). Experimental results showed that the measurement sensitivity of glucose concentration based on a single tapered SMF was 0.0494 nm/(mmol/L). Furthermore, the measurement sensitivity based on the cascaded tapered SMFs was enhanced by 4.86 times to an ultra-high level of 0.2402 nm/(mmol/L). The resolution reached 0.083 mmol/L. The refractive index sensitivity reached 9066 nm/RIU. The resolution reached 2.21×10-6 RIU. In addition, the proposed glucose concentration sensor based on CMZIs shows good hysteresis. In conclusion, the designed sensor, showing the merits of easy to fabricate, high sensitivity, and high detection resolution, could be used to monitor the tiny variation in glucose concentration.

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“…Sensitivity, as an important parameter for evaluating optical fiber sensors, is expressed by wavelengthinterrogation method in SI in equation (6) [29]:…”

Section: Sensing Principle Of Simentioning

confidence: 99%

A sensitive methane gas sensor based on sagnac interferometer with a cryptophane-A film-coated birefringent photonic crystal fiber : design and FEM simulation

Li,

Chen,

et al. 2024

Phys. Scr.

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As being sensitive to methane gas, cryptophane-A is widely used in fiber optic methane gas sensors. In order to further improve the sensitivity, a Sagnac interference (SI) was constructed with a cryptophane-A film coated birefringent photonic crystal fiber (PCF) to realize the methane gas sensing. Cryptophane-A film absorbs the methane gas and as a result its refractive index decreases linearly with the increasing of methane gas concentration. Simulation results utilizing the finite element method demonstrate that sensitivity reaches 124.4 nm/% when the methane concentration ranges from 0% to 3.5%. The high sensitivity performance ensures a candidate of the designed sensor in early warning of methane gas leakage.

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Ultrasensitive fiber-optic temperature sensor based on cascaded Sagnac interferometers with a nematic liquid crystal film

Cited by 32 publications

References 15 publications

Paralleled Sagnac interferometer and Mach–Zehnder interferometer for enhanced measurements sensitivity based on Vernier effect

Paralleled Sagnac interferometer and Mach–Zehnder interferometer for enhanced measurements sensitivity based on Vernier effect

Ultra-sensitive fiber optic sensor for glucose concentration measurement based on Vernier effect in cascaded Mach–Zehnder interferometers

A sensitive methane gas sensor based on sagnac interferometer with a cryptophane-A film-coated birefringent photonic crystal fiber : design and FEM simulation

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