Diffraction of light by ultra-sonic waves of very high frequencies

Bhagavantam, S. ; Ramachandra Rao, B. (1946) Diffraction of light by ultra-sonic waves of very high frequencies Nature, 158 . p. 484. ISSN 0028-0836

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Official URL: http://www.nature.com/nature/journal/v158/n4014/ab...

Related URL: http://dx.doi.org/10.1038/158484a0


Using a specially constructed rectifier giving 1,100 volts and a Taylor T 55 valve with amphenol bases and special inductances, frequencies up to 100 megacycles per second have been produced. A tourmaline plate prepared in this laboratory with a thickness of 2 mm. and a fundamental of about 2 Mc./sec. is made to oscillate up to its 54th harmonic, and at all stages it could be employed to maintain stationary waves in a column of water in the usual manner. Diffraction patterns at almost all the frequencies in the range 2 to 100 Mc./sec. could be observed. The highest frequency so far adopted1 for such work is only 52.5 Mc./sec. In order to detect dispersion, if any, of ultra-sonic velocity in water, the crystal has been simultaneously excited by us at two frequencies and both patterns photographed on the same plate at the same instant.

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