Browse Prior Art Database

Ultrasonic Amplifier

IP.com Disclosure Number: IPCOM000097445D
Original Publication Date: 1962-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Dumke, WP: AUTHOR [+2]

Abstract

This ultrasonic amplifier comprises a crystalline semimetal 1 selected from the group consisting of bismuth, arsenic and antimony. On opposite faces of semimetal 1 there are fixed an ultrasonic signal source 2a and utilization devices 2b.

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Ultrasonic Amplifier

This ultrasonic amplifier comprises a crystalline semimetal 1 selected from the group consisting of bismuth, arsenic and antimony. On opposite faces of semimetal 1 there are fixed an ultrasonic signal source 2a and utilization devices 2b.

The dotted line 6 represents apparatus used providing the very low temperatures necessary for the proper operation of the ultrasonic amplifier.

Perpendicular electric and magnetic fields E and H are produced. The former is effected by two conductors 4a and 4b connected to a supply source 5. The latter is realized by magnetic devices 3a and 3b. Both fields are applied to this amplifier. The velocity of carriers due to these fields within the crystalline body are perpendicular to the electric and magnetic fields. The values of the electric and magnetic fields are so selected that the velocity of carriers v, which equals Ec/H, is greater than the sound velocity S in the body.

Thus, a sound wave is introduced into this body in the direction of the velocity of the carriers so that ultrasonic amplification of this sound wave is achieved.

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