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Accession Number:
AD1099297
Title:
Quantitative Amplitude Measuring Phi-OTDR Using Multiple Uncorrelated Rayleigh Backscattering Realizations
Corporate Author:
NAVAL RESEARCH LAB WASHINGTON DC WASHINGTON United States
Report Date:
2019-11-14
Abstract:
We propose and demonstrate a technique to perform quantitative strain sensing using the amplitude of the Rayleigh backscattered light in a modified phi-OTDR system. While standard amplitude measuring phi-OTDR sensors can identify the presence of strain, they cannot perform quantitative measurements because the amplitude of the Rayleigh backscattered light exhibits a non-linear and unpredictable strain response. Here, we demonstrate a technique to computationally recover a linear strain response from a set of uncorrelated Rayleigh backscattering measurements. Using a combination of frequency and polarization multiplexing, we constructed a phi-OTDR system capable of recording 18 uncorrelated Rayleigh backscattering measurements in parallel. By combining information from these 18 measurements, the sensor achieves a linear strain response with total harmonic distortion below -35 dB. The sensor is immune to signal fading, has a minimum detectable strain of 5 p epsilonroot Hz and a bandwidth of 500 kHz.
Descriptive Note:
Journal Article - Open Access
Supplementary Note:
Optics Express , 27, 24, 01 Jan 0001, 01 Jan 0001,
Pages:
0009
Distribution Statement:
Approved For Public Release;
File Size:
2.11MB
