Acoustic waves generated through a viscoelastic anisotropic medium by a pulsed laser focused along a line source

1999 ◽  
Author(s):  
S. Guilbaud ◽  
B. Audoin
Keyword(s):  
Anisotropic Medium ◽  
Acoustic Waves ◽  
Line Source ◽  
Pulsed Laser

scholarly journals Characterization of Ablated Bone and Muscle for Long-Pulsed Laser Ablation in Dry and Wet Conditions

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1338 ◽  
Author(s):  
Nguendon Kenhagho ◽  
Shevchik ◽  
Saeidi ◽  
Faivre ◽  
Meylan ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Thermal Damage ◽  
Pulsed Laser ◽  
Principal Component ◽  
Classification Error ◽  
Ablation Efficiency ◽  
Mahalanobis Distances ◽  
Dry Conditions ◽  
Fast Healing

Smart laser technologies are desired that can accurately cut and characterize tissues, such as bone and muscle, with minimal thermal damage and fast healing. Using a long-pulsed laser with a 0.5–10  ms pulse width at a wavelength of 1.07  µm, we investigated the optimum laser parameters for producing craters with minimal thermal damage under both wet and dry conditions. In different tissues (bone and muscle), we analyzed craters of various morphologies, depths, and volumes. We used a two-way Analysis of Variance (ANOVA) test to investigate whether there are significant differences in the ablation efficiency in wet versus dry conditions at each level of the pulse energy. We found that bone and muscle tissue ablated under wet conditions produced fewer cracks and less thermal damage around the craters than under dry conditions. In contrast to muscle, the ablation efficiency of bone under wet conditions was not higher than under dry conditions. Tissue differentiation was carried out based on measured acoustic waves. A Principal Component Analysis of the measured acoustic waves and Mahalanobis distances were used to differentiate bone and muscle under wet conditions. Bone and muscle ablated in wet conditions demonstrated a classification error of less than 6.66 % and 3.33 %, when measured by a microphone and a fiber Bragg grating, respectively.

Pulsed laser-stimulated surface acoustic waves in p-CdTe crystals

2001 ◽  
Vol 35 (8) ◽  
pp. 924-926 ◽  
Author(s):  
A. Baidullaeva ◽  
A. I. Vlasenko ◽  
É. I. Kuznetsov ◽  
A. V. Lomovtsev ◽  
P. E. Mozol’ ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Pulsed Laser

Diffraction of Cylindrical Waves by a Transmissive Half-Plane

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
Yusuf Ziya Umul
Keyword(s):  
Half Plane ◽  
Acoustic Waves ◽  
High Frequency ◽  
Line Source ◽  
Geometrical Optics ◽  
Cylindrical Waves ◽  
Uniform Theory Of Diffraction ◽  
The Waves

The scattered acoustic waves by a transmissive half-plane, which is illuminated by a line source, are investigated. The high-frequency diffracted wave expressions are obtained by taking into account a resistive half-screen that is defined in electromagnetics. The uniform diffracted fields are expressed in terms of the Fresnel cylinder functions. The behavior of the waves is compared with the case when the uniform theory of diffraction is considered. The geometrical optics and diffracted fields are examined numerically.

Sign in / Sign up

Export Citation Format

Share Document