Periodically non‐homogeneous acoustic beams and their application in acousto‐optics

2008 ◽  
Vol 123 (5) ◽  
pp. 3143-3143
Author(s):  
Vladimir I. Balakshy ◽  
Bogumil B. Linde
Keyword(s):  
Acoustic Beams

Ray spectra and structure of acoustic beams in crystals

2013 ◽  
Vol 21 (4) ◽  
pp. 314-319 ◽  
Author(s):  
A. A. Ermakov ◽  
V. I. Balakshy ◽  
S. N. Mantsevich
Keyword(s):  
Acoustic Beams

scholarly journals Collimated acoustic beams from radial modes of piezoelectric disc transducers

2019 ◽  
Author(s):  
Vamshi Krishna Chillara ◽  
Eric S. Davis ◽  
Cristian Pantea ◽  
Dipen N. Sinha
Keyword(s):  
Acoustic Beams ◽  
Piezoelectric Disc

Experimental analysis of the instantaneous mechanical torque applied to objects by means of acoustic beams

2018 ◽  
Vol 144 (3) ◽  
pp. 1933-1933
Author(s):  
Ruben D. Muelas-Hurtado ◽  
Joao L. Ealo ◽  
Karen Volke-Sepulveda
Keyword(s):  
Experimental Analysis ◽  
Acoustic Beams

Focused acoustic beams for nozzleless droplet formation

2003 ◽  
Author(s):  
S.A. Elrod ◽  
B. Hadimioglu ◽  
B.T. Khuri-Yakub ◽  
E.G. Rawson ◽  
C.F. Quate
Keyword(s):  
Droplet Formation ◽  
Acoustic Beams

scholarly journals Multifrequency target strength of northern krill (Meganyctiphanes norvegica) swimming horizontally

2011 ◽  
Vol 69 (1) ◽  
pp. 119-130 ◽  
Author(s):  
Lucio Calise ◽  
Tor Knutsen
Keyword(s):  
Length Distribution ◽  
Ex Situ ◽  
Target Strength ◽  
Acoustic Backscatter ◽  
Acoustic Measurements ◽  
Acoustic Beams ◽  
Meganyctiphanes Norvegica ◽  
Acoustic Identification ◽  
Made In

Abstract Calise, L., and Knutsen, T. 2012. Multifrequency target strength of northern krill (Meganyctiphanes norvegica) swimming horizontally. – ICES Journal of Marine Science, 69: 119–130. Multifrequency acoustic measurements on ex situ horizontally swimming krill were made in a novel experimental setting. An ensemble of northern krill (Meganyctiphanes norvegica) was introduced to a large enclosure (a mesocosm), and acoustic backscatter was sampled using a multifrequency (70, 120, and 200 kHz) echosounder (Simrad EK60). Two submerged lamps were placed at opposite sides of the mesocosm and switched on and off to induce the krill, by light attraction, to swim horizontally through the acoustic beams. By tracking echoes, animal displacement, swimming speed, and target strength (TS) by frequency were estimated. The dominant and secondary modes of the total-length distribution were 21.8 ± 3.0 and 27.8 ± 2.7 mm, respectively. Although krill orientation was assumed stable and the ping rate was high, the range and inter-ping variability of the average TS values were large, decreasing and increasing with frequency, respectively. The overall TS frequency response observed and concurrent measurements at 120 and 200 kHz confirm the theoretical expectation that the acoustic backscatter from the investigated organisms were confined to the Rayleigh and Geometric scattering regions, a finding that might both aid acoustic identification and size-group separation of in situ northern krill.

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