Modeling of the ablation source in laser-ultrasonics

Hoffmann, A.; Arnold, W.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p279
Academic Journal
For the excitation of ultrasound by optical irradiation two principal mechanisms play a role. One of them, the so-called thermoplastic effect has been quantitatively described by several groups. In this work, a quantitative model describing the second effect, the excitation of ultrasonic signals by evaporation of the surface of the material onto which the laser pulses impinges, is presented. The evaporation, the expansion of the evaporated material as well as the interaction with the optical radiation is treated in a one-dimensional model. The pressure exerted on the surface of the specimen which results from the expanding vaporized material is used as source for the generation of the ultrasonic signals in the material or component insonified. There is an optical intensity at which the broadband ultrasonic signals exhibit maximal amplitude. The amplitude of the ultrasonic signals calculated using the model presented and the amount of ablated material are compared with experimental results. Despite the simplifications made, the agreement between theory and experiment is excellent for steel and satisfactory for aluminum. The results of this work can be used to optimize the parameters for a laser-based ultrasonic inspection system. © 2000 American Institute of Physics.


Related Articles

  • Studies of laser-generated ultrasonic waveforms at different orientations. Scruby, C. B. // Applied Physics Letters;1/13/1986, Vol. 48 Issue 2, p100 

    The ultrasonic waveforms generated by a pulsed laser incident at two positions on a steel plate are studied as a function of laser energy. At the 45° position there is a steady increase in compression wave amplitude with energy when passing from thermoelastic to ablation regimes, in contrast...

  • Corrections.  // Thyroid;Oct2011, Vol. 21 Issue 10, p1169 

    Corrections to an article on the causes of hyperthyroidism in the June 2011 issue and an article on ultrasound-guided laser ablation of incidental papillary thyroid microcarcinoma in the August 2011 issue are presented.

  • Optodynamic description of a linear momentum transfer from a laser induced ultrasonic wave to a rod. Požar, T.; Možina, J. // Applied Physics A: Materials Science & Processing;May2008, Vol. 91 Issue 2, p315 

    We present a new optodynamic experimental technique to measure the linear momentum obtained by a rod during a nanosecond laser pulse ablation of the rod’s front face on the basis of the displacement due to an ultrasonic wave reflection at its rear end. With the help of a simple theory, we...

  • Ultrasound-Stimulated Mutual Interaction Forces between Optically Configured Micro-Bubble Pairs. Prentice, Paul A.; Campbell, Paul A. // AIP Conference Proceedings;2007, Vol. 911 Issue 1, p212 

    The mutual interaction between two oscillating encapsulated microbubbles was investigated using a novel optical trapping arrangement. This approach facilitated the development of an arbitrary, stable, initial spatial configuration for a two-bubble system. Critically, exercising optical control...

  • Strongly focusing multielement therapeutic emitters for noninvasive ultrasonic ablation of adipose tissue. Goland, V. I.; Kushkuley, L. M. // Acoustical Physics;Oct2009, Vol. 55 Issue 4/5, p496 

    For ultrasonic ablation of adipose tissue it is necessary to dynamically focus high intensity acoustic energy in a depth interval of 5–40 mm from the skin surface. One of the methods for achieving this goal is the use of powerful spherical emitters having large aperture angles, which are...

  • A Sensor for Laser Ultrasonic Measurement of Elastic Properties of Moving Paper. Ridgway, P.; Russo, R.; Lafond, E.; Jackson, T.; Zhang, X. // AIP Conference Proceedings;2005, Vol. 760 Issue 1, p1698 

    An automated, non-contact, non-destructive sensor has been developed for measurement of sheet flexural and shear rigidity in paper manufacturing. It was tested on a pilot web handler at web speeds up to 25.4 m/s. A model equation was fitted to the frequency dependence of the phase velocity of Ao...

  • Laser ablation ICP-MS analysis of incremental biological structures:archives of trace element accumulation Evans, R. D.; Outridge, P. M.; Veinott, G. // Environmental Reviews;1995, Vol. 3 Issue 2, p160 

    No abstract available.

  • Modeling topology formation during laser ablation. Hodapp, T.W.; Fleming, P.R. // Journal of Applied Physics;7/1/1998, Vol. 84 Issue 1, p577 

    Provides information on a study investigating the modeling topology formation during laser ablation. Methodology used to conduct the study; Measurements of the physical parameters; Description on the construction of the model; Findings of the study.

  • Magnetic properties of MnZnTi and NiZn ferrite films deposited by laser ablation. Amado, M.M.; Bibicu, I.; Rogalski, M.S.; Guimaraes, L.; Sousa, J.B.; Welch, R.G.; Palmer, S.B. // Journal of Applied Physics;6/1/1998 Part 2 of 2, Vol. 83 Issue 11, p6852 

    Studies the magnetic behavior of manganese, zinc and titanium (MnZnTi) and nickel and zinc (NiZn) ferrite films, deposited by laser ablation. Comparison of the magnetic properties of the laser ablated films with those of the bulk material; Experimental procedure used; Results and discussion on...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics