Abstract
We develop a novel discriminative sensing technique of strain and temperature using Brillouin scattering and fluorescence in an erbium-doped fiber (EDF). First, we show that the fluorescence intensity ratio (FIR), the ratio of the fluorescence intensities at two different wavelengths (1530 nm and 1565 nm in this experiment), is linearly dependent on temperature (with a coefficient of 5.6 × 10⁻⁴ /°C) but almost independent of strain. Then, by combined use of the FIR and the Brillouin frequency shift in an EDF, we experimentally demonstrate discriminative measurements of strain and temperature with four different sets of strain and temperature changes.
Highlights
As a promising technology for structural health monitoring, fiber-optic distributed strain and temperature sensing based on Brillouin scattering has been extensively studied for several decades [1,2,3,4,5], and various measurement techniques in time- [1,2], frequency- [3], and correlation-domains [4,5] have been developed
We show in a proof-of-concept demonstration that a discriminative strain and temperature measurement can be performed using the Brillouin frequency shift (BFS) and the fluorescence intensity ratio (FIR) in an erbium-doped fiber (EDF)
We carried out a proof-of-concept demonstration of a discriminative strain/temperature measurement by simultaneous use of the FIR and Brillouin gain spectrum (BGS) in an erbiumdoped fiber (EDF) for the first time to the best of our knowledge
Summary
As a promising technology for structural health monitoring, fiber-optic distributed strain and temperature sensing based on Brillouin scattering has been extensively studied for several decades [1,2,3,4,5], and various measurement techniques in time- [1,2], frequency- [3], and correlation-domains [4,5] have been developed. Some research groups [6,7] have tried to utilize multiple acoustic resonance peaks at different orders of Brillouin gain spectrum (BGS) in a single specially-designed optical fiber, but the discrimination accuracy was not sufficient because all the acoustic resonance frequencies show similar behaviors in their dependences on strain and temperature Another method is to make use of the peak amplitude (or bandwidth) and BFS in the BGS simultaneously [8,9], but the discrimination accuracy was not sufficient either because of the low signal-to-noise ratio in the distributed measurement of the peak amplitude (or bandwidth). In combination with the previously reported results on the BFS dependences on strain and temperature in EDFs [12], we experimentally demonstrate a discriminative measurement of strain and temperature in four cases, where estimated values agree well with actual values
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