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Related Experiment Video

Updated: Jun 12, 2026

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
06:51

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Published on: August 21, 2018

A stepped-plate bi-frequency source for generating a difference frequency sound with a parametric array.

Yub Je1, Haksue Lee, Jongkyu Park

  • 1Department of Mechanical Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Nam-gu, Pohang, Gyungbuk 790-784, Korea.

The Journal of the Acoustical Society of America
|June 17, 2010
PubMed
Summary

A modified ultrasonic radiator can now generate a difference frequency sound from two ultrasound frequencies in air using a parametric array. This advancement makes the technology suitable for parametric sound generation in air.

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Area of Science:

  • Acoustics
  • Ultrasonics
  • Parametric Arrays

Background:

  • The stepped-plate ultrasonic radiator generates directive, high-amplitude ultrasound in air at a single frequency.
  • Parametric array sources require the ability to generate sound at multiple frequencies.

Purpose of the Study:

  • To modify the stepped-plate ultrasonic radiator for parametric array applications in air.
  • To design and test an ultrasonic radiator capable of generating a difference frequency sound.

Main Methods:

  • A design modification was proposed for the stepped-plate ultrasonic radiator.
  • A prototype parametric radiator was constructed and experimentally evaluated.

Main Results:

  • The modified radiator successfully generated a difference frequency sound.
  • The single small-area transducer proved suitable as a parametric radiator in air.

Conclusions:

  • The proposed design modification enables the use of stepped-plate ultrasonic radiators as parametric array sources in air.
  • This research validates the feasibility of generating parametric sound in air with the developed device.