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Updated: Jul 7, 2026

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
Published on: August 21, 2018
Technique for generation of unipolar ultrasonic pulses
1Ames Lab., Iowa State Univ., IA.
Abstract:
A transmit-receive switch has been developed that permits the generation and detection of broadband unipolar ultrasonic stress pulses in a pulse-echo mode. Results obtained with conventional planar transducers show that the bandwidths obtained are significantly larger than those realized with conventional ultrasonic pulse-echo techniques. The broadband technique is expected to be applicable to flaw sizing problems encountered in nondestructive evaluation (NDE) and to the measurement of gradients in material properties that can be related to changes in the acoustic impedance.
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