A new methane sensor based on compound film-coated photonic crystal fiber and Sagnac interferometer with higher sensitivity

Wang, Haoran; Wen, Zhang; Chen, Cancan; Tang, Shoufeng; Liu, Hai

doi:10.1016/j.rinp.2019.102817

Cited by 17 publications

(8 citation statements)

References 20 publications

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“…The reason for the above phenomenon was that the cladding hole had a great binding effect on the core energy and prevented the coupling between the core mode and the metal film. 1.99 nm/% 0 % -3.5% SPR [30] 4.03 nm/% 0 % -3.5% LPFG [19] 2.5 nm/% 0 % -3.5% Intermodal interference [21] 0.514 nm/% 0 % -3.5% Sagnac interference [32] 36.64 nm/% 0 % -3.5% SPR (this work) 9.88 nm/% 0 % -3.5%…”

Section: Resultsmentioning

confidence: 62%

“…In reference [19], gas sensing using grating had the characteristics of fast response, but its sensitivity was not high. In reference [21,32] The advantages of interferometric optical fiber methane sensor are accurate measurement and high sensitivity. Its disadvantage is that it is greatly affected by temperature, humidity and air pressure and cannot meet the requirements of distributed sensing.…”

Section: Resultsmentioning

confidence: 99%

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Highly sensitive methane gas sensor based on Au/UVCFS films coated D-shaped photonic crystal fiber

Chen

et al. 2023

Phys. Scr.

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In recent years, the proportion of methane explosion accidents in coal mine production accidents is increasing. The important measure to avoid methane explosion accident is to do well in methane leakage detection. It is difficult for methane gas to pass into the SPR based PCF methane gas sensor. In order to address this issue, a D-shaped PCF methane gas sensor based on surface plasmon resonance was proposed and investigated based on the finite element method in this paper. A side polished air hole in the D-shaped PCF was utilized as the substrates for depositing gold film and methane gas sensitive film. The sensing area is in direct contact with the outside world. Simulation results showed that the methane gas measurement sensitivity reached 9.88 nm/% at the methane concentration of 0-3.5%. The designed sensor is expected to be a candidate for methane gas leakage detection.

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Section: Resultsmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 99%

Highly sensitive methane gas sensor based on Au/UVCFS films coated D-shaped photonic crystal fiber

Chen

et al. 2023

Phys. Scr.

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“…In [11] the sensor is based on the MZI principle, which has the disadvantage of low sensitivity. In [31] the sensor based on the principle of SI, has higher sensitivity compared to previously reported fiber sensors filled with cryptophane-A. However, its disadvantage lies in the fact that abrasion can reduce the strength of the fiber.…”

Section: Resultsmentioning

confidence: 93%

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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“…Fiber gratings are not the optimal choice due to their high production cost, complicated production process, and insufficient sensitivity, which makes it difficult to monitor changes in the number of parameters. Many researchers chose to use SI in the measurement of multiple parameters [28][29][30][31]. In the Sagnac loop, a fixed-length polarization maintaining fiber (PMF) with a fixed birefringence coefficient is sandwiched between two SMFs.…”

Section: Introductionmentioning

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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A new methane sensor based on compound film-coated photonic crystal fiber and Sagnac interferometer with higher sensitivity

Cited by 17 publications

References 20 publications

Highly sensitive methane gas sensor based on Au/UVCFS films coated D-shaped photonic crystal fiber

Highly sensitive methane gas sensor based on Au/UVCFS films coated D-shaped photonic crystal fiber

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

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

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