Multipole expansion for nonlinear acoustic scattering at the difference‐frequency.

2010 ◽  
Vol 127 (3) ◽  
pp. 1845-1845
Author(s):  
Glauber T. Silva
Keyword(s):  
Acoustic Scattering ◽  
Multipole Expansion ◽  
Difference Frequency ◽  
Nonlinear Acoustic ◽  
The Difference

Tunable Far-Infrared Radiation Generated from the Difference Frequency between Two Ruby Lasers

1969 ◽  
Vol 180 (2) ◽  
pp. 363-365 ◽  
Author(s):  
D. W. Faries ◽  
K. A. Gehring ◽  
P. L. Richards ◽  
Y. R. Shen
Keyword(s):  
Infrared Radiation ◽  
Far Infrared ◽  
Difference Frequency ◽  
The Difference ◽  
Far Infrared Radiation

scholarly journals Active Nonlinear Acoustic Sensing of an Object with Sum or Difference Frequency Fields

2017 ◽  
Vol 9 (9) ◽  
pp. 954 ◽  
Author(s):  
Wenjun Zhang ◽  
Yuming Liu ◽  
Purnima Ratilal ◽  
Byunggu Cho ◽  
Nicholas Makris
Keyword(s):  
Difference Frequency ◽  
Acoustic Sensing ◽  
Nonlinear Acoustic

DIFFERENCE FREQUENCY HARMONIC ION HEATING

1967 ◽  
Vol 45 (5) ◽  
pp. 1771-1781 ◽  
Author(s):  
C. R. James ◽  
W. B. Thompson
Keyword(s):  
High Frequency ◽  
Collision Frequency ◽  
Difference Frequency ◽  
Fourth Power ◽  
Heating Process ◽  
Ion Heating ◽  
Frequency Signal ◽  
Transverse Waves ◽  
The Difference ◽  
Frequency Harmonic

The heating of a magnetized hot diffuse plasma using the difference frequency signal generated from two high-frequency (35 GHz) transverse waves is examined. The plasma is described by the cold plasma model and a series expansion of harmonics is used to obtain a solution to the equations. It is shown that the energy absorbed by the ions can be made inversely proportional to the collision frequency and the fourth power of the driven frequency and proportional to the fourth power of the driven electric field intensity. An investigation of the sensitivity of the heating process to fluctuations in frequency, density, and d-c. magnetic field is carried out.

Standard‐target calibration of a parametric sonar over the difference‐frequency band, 1–6 kilohertz.

2009 ◽  
Vol 125 (4) ◽  
pp. 2718-2718 ◽  
Author(s):  
Kenneth G. Foote ◽  
Johnny Dybedal ◽  
Eirik Tenningen
Keyword(s):  
Frequency Band ◽  
Difference Frequency ◽  
The Difference ◽  
Parametric Sonar

scholarly journals Nonlinear Resonance of Cavities Filled with Bubbly Liquids: A Numerical Study with Application to the Enhancement of the Frequency Mixing Effect

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
María Teresa Tejedor Sastre ◽  
Christian Vanhille
Keyword(s):  
Nonlinear Resonance ◽  
Frequency Component ◽  
Difference Frequency ◽  
Cavity Resonance ◽  
Global Changes ◽  
Nonlinear Frequency ◽  
Pressure Amplitude ◽  
Resonance Shift ◽  
The Difference ◽  
Frequency Mixing

This paper studies the nonlinear resonance of a cavity filled with a nonlinear biphasic medium made of a liquid and gas bubbles at a frequency generated by nonlinear frequency mixing. The analysis is performed through numerical simulations by mixing two source signals of frequencies well below the bubble resonance. The finite-volume and finite-difference based model developed in the time domain simulates the nonlinear interaction of ultrasound and bubble dynamics via the resolution of a differential system formed by the wave and Rayleigh–Plesset equations. Some numerical results, consistent with the literature, validate our procedure. Other results reveal the existence of a frequency shift of the cavity resonance at the difference-frequency component, which rises with pressure amplitude and evidences the global changes undergone by the bubbly medium under finite amplitudes. Finally, this work shows the enhancement of the amplitude of the difference-frequency component generated by parametric excitation using the nonlinear resonance shift, which is more pronounced when the second primary frequency is constant, the first one is varied to match the nonlinear resonance, and both have the same amplitude.

Nonlinear acoustic scattering from a gassy poroelastic seabed

1998 ◽  
Vol 103 (3) ◽  
pp. 1328-1336 ◽  
Author(s):  
Frank A. Boyle ◽  
Nicholas P. Chotiros
Keyword(s):  
Acoustic Scattering ◽  
Nonlinear Acoustic ◽  
Poroelastic Seabed
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