The Shadow Knows: Inferring the Density Distribution of a Nonuniform Medium from its Standing Wave Pattern

2012 ◽  
Vol 50 (5) ◽  
pp. 266-266
Author(s):  
Philippe Binder ◽  
Ian Cunnyngham
Keyword(s):  
Density Distribution ◽  
Standing Wave ◽  
Wave Pattern ◽  
Nonuniform Medium ◽  
Standing Wave Pattern

A Quasi-Standing-Wave Phenomenon Due to Oscillating Internal Flow

1980 ◽  
Vol 102 (1) ◽  
pp. 70-77 ◽  
Author(s):  
D. Rockwell ◽  
A. Schachenmann
Keyword(s):  
Standing Wave ◽  
Acoustic Waves ◽  
Wave Amplitude ◽  
Wave Pattern ◽  
Settling Chamber ◽  
Exhaust Pipe ◽  
Axisymmetric Cavity ◽  
Vortical Structures ◽  
Helmholtz Resonance ◽  
Standing Wave Pattern

The objective of this investigation is to characterize a quasi-standing-wave pattern having a wavelength two orders of magnitude smaller than the corresponding acoustic wavelength, and relate it to the presence of: a) a downstream travelling wave due to vortical structures generated in a free shear layer, and b) downstream and upstream propagating acoustic waves. In this experiment, the vortical structures were generated by flow past an axisymmetric cavity and their influence extended downstream through the exhaust pipe. The amplitudes of the acoustic waves were associated with Helmholtz resonance of the upstream settling chamber. A linear theory models well the measured amplitude and phase distributions of the fluctuating velocity in the core flow. As system resonance is approached, the ratio of vortex wave amplitude to acoustic wave amplitude decreases. The consequence is an increase in the magnitude and gradient of the phase change across the node, or amplitude minimum, of the resultant standing-wave pattern. In addition, the peak-to-peak amplitude of the quasi-standing-wave increases. A variety of internal (and external) flow systems, including unsteady phenomena in wind tunnels, may be subject to this flow mechanism when the frequency of coherent vortex formation in the test section lies near the Helmholtz resonance frequency of the upstream settling (or plenum) chamber.

Standing wave pattern on automobile radio antenna

1984 ◽  
Vol 22 (1) ◽  
pp. 33-33 ◽  
Author(s):  
Hannele Merivuori ◽  
Jeffrey A. Sands
Keyword(s):  
Standing Wave ◽  
Wave Pattern ◽  
Standing Wave Pattern

A new impedance matching approach for microstrip Rotman lens based on analyzing the standing wave pattern of an electric field

2019 ◽  
Vol 62 (4) ◽  
pp. 1594-1607
Author(s):  
Mohammed K. Al‐Obaidi ◽  
Noorsaliza Abdullah ◽  
Samsul H. Dahlan ◽  
Roshayati Yahya ◽  
Ezri Mohd
Keyword(s):  
Electric Field ◽  
Standing Wave ◽  
Impedance Matching ◽  
Wave Pattern ◽  
Standing Wave Pattern

scholarly journals Pulsar Microstructure Quasi-Periodicity

1981 ◽  
Vol 95 ◽  
pp. 199-204
Author(s):  
Valentin Boriakoff ◽  
Dale C. Ferguson ◽  
Gregory Slater
Keyword(s):  
Neutron Star ◽  
Standing Wave ◽  
Wave Pattern ◽  
Average Period ◽  
Polar Cap ◽  
Standing Wave Pattern ◽  
Light Cylinder ◽  
Velocity Of Light ◽  
Cylinder Model

Microstructure in pulsars occasionally has a quasi-periodic character with an average period of around 0.9 ms. A survey of this little known phenomenon (time characteristics, polarization, frequency behaviour, etc.) together with some new results are presented. Some physical interpretations (e.g. vibration of the neutron star, polar cap periodical sparking, standing wave pattern in the velocity of light cylinder model) are also presented.

Observation of an evolving standing-wave pattern involving a transverse disturbance in superfluidB3

1993 ◽  
Vol 71 (14) ◽  
pp. 2264-2267 ◽  
Author(s):  
S. Kalbfeld ◽  
D. M. Kucera ◽  
J. B. Ketterson
Keyword(s):  
Standing Wave ◽  
Wave Pattern ◽  
Standing Wave Pattern

Characterizing whispering-gallery modes in microspheres by direct observation of the optical standing-wave pattern in the near field

1996 ◽  
Vol 21 (10) ◽  
pp. 698 ◽  
Author(s):  
J. C. Knight ◽  
N. Dubreuil ◽  
V. Sandoghdar ◽  
J. Hare ◽  
V. Lefèvre-Seguin ◽  
...  
Keyword(s):  
Standing Wave ◽  
Direct Observation ◽  
Near Field ◽  
Wave Pattern ◽  
Whispering Gallery Modes ◽  
Whispering Gallery ◽  
Standing Wave Pattern
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