Journal ArticleDOI
Ultrasonic Amplification in CdS
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TLDR
In this article, radiofrequency waves at 15 and 45 Mc are transduced into pressure waves at the same frequencies, and are applied to a CdS crystal, then converted by a second transducer into a r-f output wave.Abstract:
Radiofrequency waves at 15 and 45 Mc are transduced into pressure waves at the same frequencies, and are applied to a CdS crystal. The waves are then converted by a second transducer into a r-f output wave. The signal amplification is found as a function of the illumination intensity on the crystal, and the electric field parallel to the pressure waves. Positive gain may be attained for suitable values of the electric field. (T.F.H.)read more
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Journal ArticleDOI
Controlling sound with acoustic metamaterials
TL;DR: In this article, a review of the design and properties of active acoustic metamaterials can be found, as well as an overview of future directions in the field of sound manipulation.
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Piezoelectric and piezomagnetic materials and their function in transducers
Journal ArticleDOI
Amplification of Ultrasonic Waves in Piezoelectric Semiconductors
TL;DR: In this paper, the authors show that for properly prepared material, significant amplification is expected up to the microwave frequencies, and at high frequencies, gain is reduced because electron diffusion smooths out the electron bunching necessary for amplification.
Journal ArticleDOI
Piezoelectric transducer materials
H. Jaffe,D.A. Berlincourt +1 more
TL;DR: In this paper, the properties of piezoelectric crystals and ceramics are reviewed as they affect use of such materials in electroacoustic transducers and extensive data on lead titanate-zirconate-ceramics is presented to help in selection of the appropriate material for a variety of applications in the lower and medium frequency range.