scholarly journals Anomalies of hypersonic velocity and attenuation in vinylidene fluoride‐trifluoroethylene copolymer from Brillouin scattering

1990 ◽  
Vol 57 (21) ◽  
pp. 2196-2198 ◽  
Author(s):  
Zhimin Liu ◽  
V. Hugo Schmidt
Keyword(s):  
Vinylidene Fluoride ◽  
Brillouin Scattering ◽  
Hypersonic Velocity

scholarly journals Determination of the Hypersonic Velocities in the Molten Salts NaNO3 and KNO3

1974 ◽  
Vol 29 (3) ◽  
pp. 469-472 ◽  
Author(s):  
Silas E. Gustafsson ◽  
H. E. Gunilla Knape ◽  
Lena M. Torell
Keyword(s):  
Molten Salts ◽  
Brillouin Scattering ◽  
Scattered Light ◽  
Frequency Region ◽  
Relaxation Frequency ◽  
Ultrasonic Velocities ◽  
Hypersonic Velocity ◽  
Fabry Perot ◽  
Scattering Measurements

Hypersonic velocities in the molten salts NaNO3 and KNO3 have been obtained by Brillouin scattering measurements. A He-Cd laser, 4416 Å, was used as a radiation source and the scattered light was analyzed with a pressure-scanned Fabry-Perot spectrometer. The temperature dependence of the sound velocity was determined in a temperature range covering some 100° above the melting point of the investigated salts. The obtained hypersonic velocity for NaNO3 was about the same and for KNO3 greater than reported ultrasonic velocities indicating that the measurements are performed in a frequency region below any possible relaxation frequency for NaNO3 and above some possible relaxation frequencies for KNO3

Sign in / Sign up

Export Citation Format

Share Document