High Sensitivity Interferometric Microfiber Ammonia Sensor Based on Optical Fiber Taper

Min, 张敏 Zhang; Haiwei, 傅海威 Fu; Ji-jun, 丁继军 Ding; Hui-dong, 李辉栋 Li; Jing-le, 张静乐 Zhang; Yi, 朱艺 Zhu; Min, 邵敏 Shao

doi:10.3788/gzxb20184703.0306002

Cited by 4 publications

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“…Based on the theory of evanescent wave filed, in the first transition area the inputted light will partly leak out and excite high-order cladding modes. When transmitting in the second transition area, the cladding modes can re-couple into the fiber core [ 19 ]. Then a Mach-Zehnder interferometer (MZI) is formed in the taper area, and both the intensity and wavelength will be sensitive to the change of external RI.…”

Section: Principlesmentioning

confidence: 99%

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Intensity Demodulated Refractive Index Sensor Based on Front-Tapered Single-Mode-Multimode-Single-Mode Fiber Structure

Kang

Yang

Zhang

et al. 2018

Sensors

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A novel intensity demodulated refractive index (RI) sensor is theoretically and experimentally demonstrated based on the front-tapered single-mode-multimode-single-mode (FT-SMS) fiber structure. The front taper is fabricated in a section of multimode fiber by flame-heated drawing technique. The intensity feature in the taper area is analyzed through the beam propagation method and the comprehensive tests are then conducted in terms of RI and temperature. The experimental results show that, in FT-SMS, the relative sensitivity is −342.815 dB/RIU in the range of 1.33~1.37. The corresponding resolution reaches 2.92 × 10−5 RIU, which is more than four times higher than that in wavelength demodulation. The temperature sensitivity is 0.307 dB/°C and the measurement error from cross-sensitivity is less than 2 × 10−4. In addition, fabricated RI sensor presents high stability in terms of wavelength (±0.045 nm) and intensity (±0.386 dB) within 2 h of continuous operation.

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Section: Principlesmentioning

confidence: 99%

“…Fu reported a U-shape fiber humidity sensor with waist-diameter of 4.75 μm [ 18 ]. Zhang used a tapered polarization maintaining fiber to measure the concentration of ammonia [ 19 ]. In addition, the fiber structures with higher strain and curvature sensitivities are presented in [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%