Distributed discrimination of strain and temperature based on Brillouin dynamic grating in an optical fiber

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 ℃-0.3 ℃ and 5 -12 ) 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.

A Brief Review of Specialty Optical Fibers for Brillouin-Scattering-Based Distributed Sensors

“…Additional papers on tailoring the acoustic mode distribution can be found in Refs. [44,61,87,[140][141][142]. Finally, Lu et al [143] used three acoustic modes in LEAF and the relative intensity of two resulting beat signals in the several hundred MHz range for discriminative sensing.…”