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We demonstrate a novel polyvinyl chloride (PVC) diaphragm-based fiber-tip Fabry-Perot interferometer for gas pressure measurements with ultra-high sensitivity. The PVC diaphragm has been coated to the end facet of a well-cut standard single-mode fiber by use of a plastic welder. Ultrahigh pressure sensitivity of ∼66.07 nm/MPa at 1565 nm and a low temperature cross-sensitivity of —5.5 KPa/°C have been...
A new method to modify excessively titled fiber gratings (Ex-TFGs) with 20 nm gold nanoparticles (GNPs) through 3-mercapt-otrimethoxysilane(MPTMS) was proposed. By monitoring the wavelength shift of Ex-TFGs for every modified step and using the scanning electron microscope (SEM), it proves that GN Ps are firmly combined on the surface of Ex-TFGs. Finally, by using different concentration of NaCl solutions...
Comparing with uncoated LPFGs, ZnO coated LPFG shows obvious improvement of RI sensitivity between the RI range of 1.4 and 1.62. The proposed structure exhibits a very high sensitivity of 5175 nm/RIU in the RI range from 1.444 to 1.448, and the sensitivity could be further improved by optimizing the thickness of the ZnO thin film.
We demonstrated a high-robustness Fabry-Perot interferometer strain sensor based on an in-fiber elliptical bubble that was created by splicing together two sections of standard single mode fibers. Such a FPI could be used to develop a high-robustness strain sensor with a low cross-sensitivity between temperature and tensile stain. The sensitivity of this strain sensor was ∼2.4 pm/με, and exhibited...
Gas pressure sensor based on an antiresonant reflecting guidance mechanism in a hollow-core fiber (HCF) with an open microchannel is experimentally demonstrated. The microchannel is created on the ring cladding of the HCF by femtosecond laser to provide an air-core pressure equivalent to the external pressure. The HCF cladding functions as an antiresonant reflecting waveguide, which induces sharp...
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