16 November 2004 High accuracy temperature and strain measurement with cm spatial resolution for distributed Brillouin-based fiber optic sensors
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Abstract
By combining a DC and a short pulse (~ 1 ns) laser as the probe beam in the pump-probe configuration of Brillouin-based fiber optic sensors, we have developed a new two-stage method to achieve both high accuracy strain/temperature measurement and spatial resolution (order of cm ). Brillouin profile of such a configuration has a two-fold structure consisting of a Lorentzian- and a Gaussian- like portions. Lorentzian-like portion, although gathering information from all over the fiber, has localized and position-dependent information that can be extracted and employed in a signal processing method for high accuracy and resolution measurements. Level of DC to pulse power affects both the position-dependent information of the Lorentzian peak and its SNR relative to Gaussian peak. An optimum level of DC to pulse power for best SNR and position detection capability is discussed.
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Shahraam Vahid Afshar, Liang Chen, Xiaoy Bao, "High accuracy temperature and strain measurement with cm spatial resolution for distributed Brillouin-based fiber optic sensors", Proc. SPIE 5579, Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers, (16 November 2004); doi: 10.1117/12.567509; https://doi.org/10.1117/12.567509
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