Direct visualization of surface acoustic waves along substrates using smoke particles

Smoke particles (SPs) are used to directly visualize surface acoustic waves (SAWs) propagating on a 128°-rotated Y-cut X-propagating lithium niobate (LiNbO3) substrate. By electrically exciting a SAW device in a compartment filled with SP, the SP were found to collect along the regions where the SAW propagates on the substrate. The results of the experiments show that SPs are deposited adjacent to regions of large vibration amplitude and form a clear pattern corresponding to the surface wave profile on the substrate. Through an analysis of the SAW-induced acoustic streaming in the air adjacent to the substrate and the surface acceleration measured with a laser Doppler vibrometer, we postulate that the large transverse surface accelerations due to the SAW ejects SP from the surface and carries them aloft to relatively quiescent regions nearby via acoustic streaming. Offering finer detail than fine powders common in Chladni figures [E. Chladni, Entdeckungen uber die Theorie des Klanges (Weidmanns, Erben und...

[1]  A. M. Squires,et al.  Support for Faraday`s View of Circulation in a Fine-Powder Chladni Heap , 1998 .

[2]  Tsung-Tsong Wu,et al.  Analysis and design of focused interdigital transducers. , 2005, IEEE transactions on ultrasonics, ferroelectrics, and frequency control.

[3]  C. P. Yu,et al.  COAGULATION OF CIGARETTE SMOKE PARTICLES , 1999 .

[4]  Louis Vessot King,et al.  On the Acoustic Radiation Pressure on Spheres , 1934 .

[5]  Propagation of laser‐generated surface acoustic waves visualized by shake‐off of fine particles , 1995 .

[6]  Michael Faraday,et al.  XVII. On a peculiar class of acoustical figures; and on certain forms assumed by groups of particles upon vibrating elastic surfaces , 1831, Philosophical Transactions of the Royal Society of London.

[7]  K. Saoud,et al.  Study of cigarette smoke aerosol using time of flight mass spectrometry , 2004 .

[8]  G. Brereton,et al.  Mechanisms of removal of micron-sized particles by high-frequency ultrasonic waves , 1995, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[9]  Wesley Le Mars Nyborg,et al.  11 - Acoustic Streaming , 1965 .

[10]  T. Reeder,et al.  Visualisation of surface acoustic waves , 1970 .

[11]  J.J. Campbell,et al.  A method for estimating optimal crystal cuts and propagation directions for excitation of piezoelectric surface waves , 1968, IEEE Transactions on Sonics and Ultrasonics.

[12]  M. Hegner,et al.  Chladni figures revisited based on nanomechanics. , 2007, Physical review letters.

[13]  C. E. Bradley.  Acoustic streaming field structure: The influence of the radiator , 1996 .

[14]  A short history of bad acoustics. , 2006, The Journal of the Acoustical Society of America.

[15]  J. Baruchel,et al.  Visualization of 10 μm surface acoustic waves by stroboscopic x-ray topography , 1998 .

[16]  S. Patankar.  Numerical Heat Transfer and Fluid Flow , 2018, Lecture Notes in Mechanical Engineering.

[17]  E. Bender.  Numerical heat transfer and fluid flow. Von S. V. Patankar. Hemisphere Publishing Corporation, Washington – New York – London. McGraw Hill Book Company, New York 1980. 1. Aufl., 197 S., 76 Abb., geb., DM 71,90 , 1981 .

[18]  Tatsuya Omori,et al.  High-Speed Laser Probing System for Surface Acoustic Wave Devices Based on Knife-Edge Method , 2005 .