07:49 Jul-16-2005 Dr. Anish Kumar R & D, Scientist Indira Gandhi Centre for Atomic Research, India, Joined Mar 2000 7
Re: WAVE PATTERN Hi Krishnan, You are right. The frequency characteristics of the ultrasoic wave (I assume you are talking about ultrasoic wave only) changes as it propagates through materials with different grain sizes due to different frequency dependent attenuation. You may see our following papers:
1.Anish Kumar, T. Jayakumar and Baldev Raj "Ultrasonic Spectral Analysis for Microstructural Characterization in Austenitic and Ferritic Steels", Philosophical Magazine A, Vol. 80 (2000) pp. 2469-2487. 2.Anish Kumar, T. Jayakumar, P. Palanichamy and Baldev Raj, "Influence of Grain Size on Ultrasonic Spectral Parameters in AISI Type 316 Stainless Steel Scripta Materialia, Vol. 40 (1999) pp. 333-340.
----------- Start Original Message ----------- : Dear Sirs, : Is it same of wave pattern (wavelenth and other characteristics) which produced in transducer element and RECEIVING signal after interfering with material' grain structures. : Because I feel that wave length will be distrubed whenit crosses too many size of grain boundries. : Please kindly explain me about this topic. : Thank you very much : Regards, : Krishnan ------------ End Original Message ------------