Abstract
This paper reviews distributed discrimination of strain and temperature by use of an optical fiber based on fiber optic nerve systems. The preliminary method based on multiple resonance peaks of the Brillouin gain spectrum in a specially-designed fiber is firstly introduced. The complete discrimination of strain and temperature based on the Brillouin dynamic grating in a polarization maintaining fiber is extensively presented. The basic principle and two experimental schemes of distributed discrimination based on fiber optic nerve systems are demonstrated. The performance of the high discriminative accuracy (0.1 °C–0.3°C and 5 μɛ–12μɛ) and high spatial resolution (∼10 cm) with the effective measurement points of about 50 for a standard system configuration or about 1000 for a modified one will be highly expected in real industry applications.
Highlights
The fiber optic nerve system of the Brillouin optical correlation-domain analysis (BOCDA) [1,2,3] or reflectometry (BOCDR) [4,5,6] takes use of the correlation-domain continuous-wave technique, which is more advantageous than the Brillouin optical time-domain analysis (BOTDA) [7, 8] and reflectometry (BOTDR) [9, 10]
We demonstrate the research trends of distributed discrimination of strain and temperature by use of an optical fiber based on fiber optic nerve systems
A Panda-type polarization-maintaining fiber (PMF), which has been widely used for optical fiber communications [23] or fiber-optic sensors [24], is composed of two B2O3-doped-silica stress-applying parts that are inserted in a pure-silica cladding and symmetrically placed beside a GeO2-doped-silica core [see Figs. 5(a) and 5(b)]
Summary
The fiber optic nerve system of the Brillouin optical correlation-domain analysis (BOCDA) [1,2,3] or reflectometry (BOCDR) [4,5,6] takes use of the correlation-domain continuous-wave technique, which is more advantageous than the Brillouin optical time-domain analysis (BOTDA) [7, 8] and reflectometry (BOTDR) [9, 10]. Fiber optic nerve systems (BOCDA and BOCDR) have been theoretically investigated and experimentally realized to provide outstanding performances in diagnosis of fully-distributed strain or temperature disturbances with an extremely-high spatial resolution of from centimeters [1, 2, 4, 5] to several millimeters [3, 6] along the whole fiber under test (FUT). Kazuo HOTATE et al.: Distributed Discrimination of Strain and Temperature Based on Brillouin Dynamic Grating in an Optical Fiber 333 development of distributed discrimination of strain and temperature is reviewed
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