Measurement of Wave Velocity in Cortical Bone by Brillouin Scattering (CAT#: STEM-ST-0136-YJL)

Introduction

Osteoporosis is a clinically common disease, one of its symptoms is thinning of cortical bone thickness. The propagation speed of ultrasound is very sensitive to changes in the thickness of the measurement object, so it is possible to use ultrasound to measure the thickness of cortical bone and thereby diagnose osteoporosis. However, due to the complex propagation of ultrasound in cortical bone, signals of multiple guided wave modes are often superimposed on each other. How to extract and identify different guided wave modes from received signals and accurately calculate the thickness of cortical bone has become one of the research hotspots in this field.

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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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