A9-a1 - Thermo-Elastic Coupling in Transient Grating Spectroscopy
- Event
- 2025 ICU PADERBORN - 9th International Congress on Ultrasonics
2025-09-21 - 2025-09-25
Paderborn - Band
- Lectures
- Chapter
- A9-a - Opto-Acoustics
- Author(s)
- J. Kušnír, K. Repček - Czech Technical University in Prague, Prague (Czechia), T. Grabec, D. Mareš, P. Stoklasová, P. Sedlák, H. Seiner - Czech Academy of Sciences, Prague (Czechia)
- Pages
- 86 - 89
- DOI
- 10.5162/Ultrasonic2025/A9-a1
- ISBN
- 978-3-910600-08-9
- Price
- free
Abstract
Characterization of the thermal diffusivity on the micrometer-thick film on a substrate by transient grating spectroscopy was investigated. The experiment was performed on a thin film of NiTi at 120 °C, when the film is in the austenitic phase and exhibits cubic crystallographic symmetry. Apparent anisotropy of thermal diffusivity was observed in the experimental results, as confirmed by finite-element model (FEM). However, the calculation confirmed that the measurement was only sensitive to the thermal diffusivity of the film, omitting the substrate.