期刊
IEEE SENSORS JOURNAL
卷 21, 期 1, 页码 360-365出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2020.3013983
关键词
Distributed pressure sensor; fiber sensor; OFDR; microstructure fiber
资金
- Financiadora de Estudos e Projetos (FINEP) [01.12.0393.00]
- Fundo Mackenzie de Pesquisa
A distributed pressure sensor using an embedded-core fiber and autocorrelation analysis with an OFDR is described in this paper. The fiber exhibited a birefringence sensitivity to pressure of 3.8x10(-7) bar(-1), which is 21% higher than that of commercial photonic crystal fibers.
In this paper, we describe a distributed pressure sensor using a simplified and high sensitivemicrostructured optical fiber - the embedded-core fiber - and autocorrelation analysis of the data obtained from an optical frequency domain reflectometer (OFDR). The special fiber consists of a microcapillary, which has a germanium-doped core placed within the capillary wall. When this structure is subjected to pressure variations, an asymmetric stress distribution is induced within the fiber, entailing birefringence variations. Here, we show that the use of a commercial OFDR with submillimeter resolutiontogether with an autocorrelationdata analysis routine in the spectral domain allows mapping the fiber birefringence and performing distributed pressure sensing. In the experiments, the fiber passed through two pressure chambers, which allowed for pressure to be locally and independently applied. No cross-sensitivity between the pressure points was observed. The embedded- core fiber exhibited a birefringence sensitivity to pressure of 3.8x10(-7) bar(-1), which is 21% higher than thatmeasured in commercial photonic crystal fibers using the same setup.
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