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Acoustophoretic system for seed separation on conveyor belts.

James Hardwick1,2, Zak Morgan3,4, Ryuji Hirayama3,4

  • 1Department of Computer Science, University College London, London, UK. james.hardwick.19@ucl.ac.uk.

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Ultrasonic phased array transducers offer a novel, low-cost method for agricultural seed sorting. This acoustophoretic system precisely ejects substandard seeds and debris using sound, enabling advanced automation.

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Area of Science:

  • Agricultural Engineering
  • Acoustics
  • Robotics

Background:

  • Seed sorting is crucial for agriculture, but conventional air-jet systems lack accuracy and flexibility.
  • Existing methods struggle with precise identification and ejection of substandard seeds.

Purpose of the Study:

  • To develop and validate an ultrasonic phased array system for precise seed sorting on conveyor belts.
  • To demonstrate advanced functionalities beyond simple ejection, such as levitation and variable categorization.

Main Methods:

  • Integration of ultrasonic phased arrays with camera detection for seed identification based on size and color.
  • Utilizing acoustic radiation forces for selective seed manipulation and ejection.
  • Experimental validation in static and dynamic conditions.

Main Results:

  • Effective separation of substandard seeds and unwanted debris using acoustophoretic control.
  • Demonstrated variable ejection distances for nuanced seed categorization.
  • Showcased functionalities like mid-air hovering and levitation for inspection and coating.

Conclusions:

  • The developed acoustophoretic system offers a low-cost, adaptable, and highly functional alternative to conventional seed sorting.
  • This technology represents a promising advancement for next-generation agricultural automation and precision sorting.