Dynamic Strain Measurement in Optical Fibers by Stimulated Brillouin Scattering (CAT#: STEM-ST-0098-YJL)

Introduction

Fiber optic sensors based on stimulated Brillouin scattering (SBS) have gained much attention in recent years owing to their unparalleled ability to continuously evaluate a measurand of interest, such as strain or temperature, along an optical fiber. The possibility to extending the use of distributed optical fiber sensors to dynamic measurements would be of special interest in some application fields, such as measurement of vibrations in civil or aeronautic structures. A few studies have been made on SBS-based fiber optics sensors capable of real-time structural monitoring applications that require a sensor response in the range of seconds or less.

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Principle Applications Procedure Materials Notes Related Products

Principle

From a quantum point of view, Brillouin scattering is an interaction of light photons with acoustic or vibrational quanta (phonons), with magnetic spin waves (magnons), or with other low frequency quasiparticles interacting with light. The interaction consists of an inelastic scattering process in which a phonon or magnon is either created (Stokes process) or annihilated (anti-Stokes process). The energy of the scattered light is slightly changed, that is decreased for a Stokes process and increased for an anti-Stokes process. This shift, known as the Brillouin shift, is equal to the energy of the interacting phonon and magnon and thus Brillouin scattering can be used to measure phonon and magnon energies.

Applications

Brillouin scattering is used to determine acoustic velocities and elastic properties of a number of crystalline solids, glasses, and liquids.

Procedure

1. Sample preparation
2. Measurement by scattering detection instrument
3. Data analysis

Materials

Brillouin scattering measurement system (Brillouin spectrometer)

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