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- W1996937322 abstract "By using a barium titanate cylinder poled radially a lengthwise motion can be excited in the cylinder whose resonant frequency is controlled by the length of the cylinder. By using a 4 percent lead titanate barium titanate combination, stresses up to 1000 lb./sq. in. of cross-sectional dimension and motions up to 50 parts in 106 times the length of the cylinder are available for static or slowly varying voltages of 15,000 v/cm along the radial dimension. When such a cylinder is driven at its resonant frequency, the maximum strain appears to be limited to 10−4 by heating considerations if no cooling is used. For a cylinder 12 cm long, which resonates at 18 kc, this corresponds to a displacement on each end of 3.9 × 10−4 cm, a particle velocity of 44 cm/sec. and an acceleration of 5 × 106 cm/sec./sec. All of these quantities can be enhanced by a factor of 10 by soldering a brass “horn,” tapered exponential, to the end of the barium titanate cylinder. If the large end of the horn, which is soldered to the cylinder, is 10 times the diameter of the small end, the horn acts as a transformer to increase the particle motion by a factor of 10. Hence a 1.5-mil motion is possible with this combination at 18 kc. This structure has been made the basis of several instruments used for testing wear, for measuring magnetic flux, for testing adhesion of films and for boring odd-shaped holes. A feed-back amplifier system with a diode limiting element is used to keep the amplitude constant." @default.
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- W1996937322 date "1950-09-01" @default.
- W1996937322 modified "2023-09-23" @default.
- W1996937322 title "Use of Barium Titanate Transducers for Producing Large Amplitudes of Motion and High Forces at Ultrasonic Frequencies" @default.
- W1996937322 doi "https://doi.org/10.1121/1.1917196" @default.
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