Unlock Exclusive Discounts & Flash Sales! Click Here to Join the Deals on Every Wednesday!

Tensile and Compressive Strain Measurement with the Distributed Brillouin Scattering Sensor (CAT#: STEM-ST-0090-YJL)

Introduction

The potential for a monitoring system to reduce operational maintenance costs by identifying problems at an early stage, and to verify the effectiveness of repair procedures, is clearly significant. Installing effective monitoring equipment and processing the collected data represents a considerable challenge that is being actively pursued worldwide. To ensure structural security of bridges, periodic monitoring, maintenance, and restoration are required. Accurate knowledge of the behavior of bridges is becoming more important as new structures tend to be lighter, and as increasing numbers of existing bridges are required to remain in service beyond their designed service life. Monitoring, both in the long and short term, helps increase understanding of the real behavior of a bridge and aids in planning maintenance interventions. In the long term, static monitoring requires an accurate and very stable system, which can relate deformation measurements taken over long periods of time.




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)