Diffraction of Light by Ultrasonic Waves, Oblique Incidence and Sound Intensity

Nature ◽  
1958 ◽  
Vol 182 (4652) ◽  
pp. 1795-1796 ◽  
Author(s):  
S. PARTHASARATHY ◽  
C. B. TIPNIS
Keyword(s):  
Oblique Incidence ◽  
Sound Intensity ◽  
Ultrasonic Waves ◽  
Diffraction Of Light

INTENSITY MEASUREMENTS IN THE DIFFRACTION OF LIGHT BY ULTRASONIC WAVES

1936 ◽  
Vol 14a (8) ◽  
pp. 158-171 ◽  
Author(s):  
F. H. Sanders
Keyword(s):  
High Frequency ◽  
Light Wave ◽  
Monochromatic Light ◽  
Sound Intensity ◽  
Ultrasonic Waves ◽  
Torsion Pendulum ◽  
Intensity Measurements ◽  
Diffraction Of Light ◽  
Absolute Measurements ◽  
Good Agreement

Measurements of the distribution of light energy among the various orders of the diffraction pattern produced when monochromatic light is passed through a liquid subjected to high-frequency ultrasonic disturbances have been carried out over a range of ultrasonic intensities at frequencies in the region of 5 megacycles per second. Both progressive and standing wave fields have been studied. Results of the experiments show excellent agreement with the theory of Raman and Nath for the variation in degree of scattering with varying ultrasonic intensity. Absolute measurements of the sound intensity conducted with a torsion pendulum are in good agreement with that expected from the theory for the liquids and light wave-lengths involved.

DIFFRACTIVE REFLECTION AND SCATTERING OF ULTRASONIC WAVES. THEIR INFLUENCE ON TORSION-PENDULUM MEASUREMENTS OF SOUND INTENSITY

1930 ◽  
Vol 3 (6) ◽  
pp. 491-509 ◽  
Author(s):  
R. W. Boyle ◽  
J. F. Lehmann
Keyword(s):  
Wave Train ◽  
Sound Intensity ◽  
Ultrasonic Waves ◽  
Special Importance ◽  
Torsion Pendulum ◽  
Sound Waves ◽  
Diffractive Scattering ◽  
Light Waves ◽  
Small Obstacle ◽  
Diffractive Reflection

Light waves are too short and ordinary sound waves generally too long to permit experimental work on diffraction and scattering by a single small obstacle. An opportunity for such work however is presented in the case of ultrasonic waves.This paper describes an experimental investigation on the factors which determine the diffractive reflection and scattering of an ultrasonic wave train by plane circular opaque discs, and discusses the results. These are of special importance in the measurement of sound energy intensity by the torsion-pendulum method, for such measurements should always be corrected to allow for the effect of diffractive scattering of the energy by the measuring-pendulum vane. The correction factor will depend on the size and form of the pendula vanes employed and for circular vanes can be obtained directly from such curves as are shown in this paper as results of the investigation.

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