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A new structure composed of silica optical fiber for hyperthermia is proposed and fabricated. Laser ablation and temperature monitoring are simultaneously performed using a wavelength division multiplexing technique with a single optical fiber. The fabricated device shows a very fine temperature resolution of 0.06 °C. Laser light of 1.48 μm wavelength with only 24.3 mW shows a sufficient temperature...
A simple analytical calculation method providing convenient design criteria for the realization of high sensitivity temperature sensor is presented. Such an approach is applicable to any type of multimode interference (MMI) structure with different core/cladding compositions. A low-complexity optical-fiber temperature sensor, based on MMI using epoxy resin as a solid cladding material, is evaluated...
We fabricated a humidity sensor by connecting single-mode-multimode-single-mode fibers and coating the sensing part with sol-gel derived porous silica, achieving a high sensitivity (0.748 nm/% at 0.4% relative humidity) and quick response.
A reflection-type refractive index sensor with an edge-rounded end face of a multimode fiber is proposed and fabricated. The fabricated sensor with the designed structure shows a two-mode interference spectrum. The measured and calculated free spectral ranges in the spectra agree well with each other. The fabricated sensor coated with titanium shows sensitivity as high as 311 nm/RIU even with a sensor...
We investigated a novel reflection technique for a reflection-type fiber-optic multimode interference structure. Rounding the fiber end-face increased the reflected light intensity by more than 10 dB, with no reflection coating. We demonstrated the use of our multimode interference structure as a temperature sensor by immersing the sensing region in temperature-controlled silicone oil. The resulting...
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