A fiber inline interferometric refractive index （RI） sensor consisting of a microchannel and a fiber taper is proposed in this letter. The microchannel is fabricated by combining femtosecond laser micromachining and...A fiber inline interferometric refractive index （RI） sensor consisting of a microchannel and a fiber taper is proposed in this letter. The microchannel is fabricated by combining femtosecond laser micromachining and arc fusion splicing. No subsequent chemical etching process is needed. Three sensors with microchannel widths of 4, 8, and 10 μm are prepared. The sensitivity in the RI range from 1.33 to 1.35 is up to -361.29 nm/RIU at the microchannel width of 8 μm. The sensitivity is -20 times greater than that of the paired taper-based MZI sensors and long period fiber grating pair MZI sensors.展开更多
A high temperature sensor based on an ultra-abrupt tapered fiber Michelson interferometer fabricated by the fusion-splicing method is proposed. The sensor consists of a single abrupt taper and the cleaved surface is u...A high temperature sensor based on an ultra-abrupt tapered fiber Michelson interferometer fabricated by the fusion-splicing method is proposed. The sensor consists of a single abrupt taper and the cleaved surface is used as the reflection mirror. The thermal characteristic is investigated at 25 to 1000 ℃. The sensitivity of the sensor is observed to vary with the temperature, that is, 25 and 78 pm/℃ at 25 300 and 300 1 000 ℃, respectively. The Michelson interferometer sensors have the advantages of simple structure, cost effectiveness, compactness, and simple fabrication process.展开更多
基金supported by the National"973"Program of China(No.2011CB013000)the NationalNatural Science Foundation of China(Nos.90923039and 51105038)
文摘A fiber inline interferometric refractive index （RI） sensor consisting of a microchannel and a fiber taper is proposed in this letter. The microchannel is fabricated by combining femtosecond laser micromachining and arc fusion splicing. No subsequent chemical etching process is needed. Three sensors with microchannel widths of 4, 8, and 10 μm are prepared. The sensitivity in the RI range from 1.33 to 1.35 is up to -361.29 nm/RIU at the microchannel width of 8 μm. The sensitivity is -20 times greater than that of the paired taper-based MZI sensors and long period fiber grating pair MZI sensors.
基金supported by the National "973" Program of China (No. 2011CB013000)the National Natural Science Foundation of China (Nos. 90923039and 51105038)
文摘A high temperature sensor based on an ultra-abrupt tapered fiber Michelson interferometer fabricated by the fusion-splicing method is proposed. The sensor consists of a single abrupt taper and the cleaved surface is used as the reflection mirror. The thermal characteristic is investigated at 25 to 1000 ℃. The sensitivity of the sensor is observed to vary with the temperature, that is, 25 and 78 pm/℃ at 25 300 and 300 1 000 ℃, respectively. The Michelson interferometer sensors have the advantages of simple structure, cost effectiveness, compactness, and simple fabrication process.
