Simultaneous Temperature and Strain Measurement by Raman and Brillouin Scattering (CAT#: STEM-ST-0100-YJL)

Introduction

Brillouin scattering has been widely investigated as a basis for fiber distributed temperature and strain measurements. Measurement of a single parameter (Brillouin frequency or power), however, is unable to discriminate the two measurands, temperature and strain. The Brillouin optical time-domain reflectometry technique was thus developed, in which both a Brillouin frequency shift and a change in power are used to produce temperature and strain changes simultaneously along a length of fiber.

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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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