title: Slope-assisted fast distributed sensing in optical fibers with arbitrary Brillouin profile.
abstract: We present a novel method, based on stimulated Brillouin scattering (SBS), for the simultaneous distributed measurement of fast strain variations along the entire length of the sensing fiber. A specially synthesized and adaptable probe wave is used to place the Brillouin interaction always on the slope of the local Brillouin gain spectrum, allowing a single pump pulse to sample fast strain variations along the full length of a fiber with an arbitrary distribution of the Brillouin frequency shift. In this early demonstration of the method, strain vibrations of a few hundred Hz are demonstrated, simultaneously measured on two different sections of an 85 m long fiber, having different static Brillouin shifts and with a spatial resolution of 1.5 m.
authors: The Faculty of Engineering, Tel-Aviv University, Tel-Aviv 69978, Israel. yairpeled@gmail.com
authors: Yair
authors: Y
authors: Peled
authors: Avi
authors: A
authors: Motil
authors: Lior
authors: L
authors: Yaron
authors: Moshe
authors: M
authors: Tur