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.

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

scholarly journals Diffraction of Light by High-Frequency Ultrasonic Waves

Nature ◽  
1947 ◽  
Vol 159 (4034) ◽  
pp. 267-267 ◽  
Author(s):  
S. BHAGAVANTAM ◽  
B. RAMACHANDRA RAO
Keyword(s):  
High Frequency ◽  
Ultrasonic Waves ◽  
Diffraction Of Light

scholarly journals The high-frequency resistance of superconducting tin

1940 ◽  
Vol 176 (967) ◽  
pp. 522-533 ◽  
Keyword(s):  
High Frequency ◽  
Skin Effect ◽  
Wave Length ◽  
Low Frequency ◽  
Mean Free Path ◽  
Low Frequencies ◽  
The Mean ◽  
Absolute Measurements ◽  
Eddy Current Heating ◽  
Good Agreement

The high-frequency resistance of tin in the superconducting state was measured at a wave-length of 20.5 cm. by a calorimetric method based on the principle of eddy-current heating. It was found that the resistance decreases gradually when the temperature falls below the transition point in contrast to the sudden drop in resistance peculiar to direct currents. An explanation of such a behaviour is given based on the assumption of the simultaneous presence of normal and superconducting electrons. Good agreement between theory and experiment was found. Absolute measurements of the conductivity in the normal state at low temperatures with both high and low frequencies were carried out, and it was found that at the temperature of liquid helium the conductivity for high frequency is considerably lower than for low frequency. This behaviour is possibly due to the fact that the mean free path of the electrons becomes larger than the penetration depth due to skin effect under the conditions of high conductivity and high frequency.

scholarly journals Diffraction of Light by Very High Frequency Ultrasonic Waves

Nature ◽  
1948 ◽  
Vol 161 (4102) ◽  
pp. 927-927 ◽  
Author(s):  
S. BHAGAVANTAM ◽  
B. RAMACHANDRA RAO
Keyword(s):  
High Frequency ◽  
Ultrasonic Waves ◽  
Very High Frequency ◽  
Diffraction Of Light ◽  
Very High

Schlieren optical filtering for sound‐intensity measurements

1980 ◽  
Vol 67 (6) ◽  
pp. 2106-2107
Author(s):  
L. Carpenedo ◽  
P. Ciuti ◽  
G. Iernetti
Keyword(s):  
Sound Intensity ◽  
Optical Filtering ◽  
Intensity Measurements

Hypersonic Velocity, Absorption and Relaxation in Molten CSNO3

1977 ◽  
Vol 32 (1) ◽  
pp. 57-60 ◽  
Author(s):  
H. E. Gunilla Knape ◽  
Lena M. Torell
Keyword(s):  
Relaxation Time ◽  
High Frequency ◽  
Viscosity Coefficient ◽  
Sound Waves ◽  
Frequency Range ◽  
Ultrasonic Velocities ◽  
Hypersonic Velocity ◽  
Frequency Shifts ◽  
Bulk Viscosity Coefficient ◽  
Good Agreement

Abstract Brillouin spectra of molten CSNO3 were investigated for scattering angles between 40 and 140° and in a temperature interval of 420-520 °C. An Ar+ singlemode laser was used for excitation and the total instrumental width was ~265 MHz. The measured frequency shifts and linewidths of the Brillouin components were used to determine velocities and attenuations of thermal sound waves in the frequency range 2.3-7.0 GHz. A dispersion of 4-5% was found between the present hyper­ sonic velocities and reported ultrasonic velocities. A considerable decrease in attenuation with frequency was observed in the investigated frequency range, with the value at high frequency ap­ proaching the classical attenuation. The results are in good agreement with Mountain's theory of a single relaxation time. The relaxation time of the bulk viscosity coefficient was calculated to 1.2×10-10S.

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