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Fluidic Ultrasound Generation for Non-Destructive Testing.

Benjamin Bühling1, Stefan Maack1, Christoph Strangfeld1

  • 1Department 8 "Non-Destructive Testing", Bundesanstalt für Materialforschung und -prüfung, Unter den Eichen 87, 12205, Berlin, Germany.

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Summary
This summary is machine-generated.

A novel fluidic ultrasonic transducer generates high-amplitude ultrasonic bursts for air-coupled ultrasonic testing (ACU). This robust, non-contact method overcomes limitations of current non-destructive testing (NDT) techniques, enabling wider industrial application.

Keywords:
aeroacousticsair‐coupled ultrasoundfluidicsharsh environmentlaser Doppler vibrometernon‐destructive testing

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Area of Science:

  • Materials Science
  • Acoustics
  • Mechanical Engineering

Background:

  • Air-coupled ultrasonic testing (ACU) is a promising non-destructive testing (NDT) method.
  • Current ACU adoption is limited, particularly at lower ultrasonic frequencies, due to challenges in generating sufficient signal amplitude with robust equipment.
  • Existing methods like contact testing and fluid immersion testing have broader applications but lack non-contact capabilities.

Purpose of the Study:

  • To introduce a novel fluidic ultrasonic transducer designed to overcome the limitations of existing ACU equipment.
  • To demonstrate the capability of this new transducer in generating high-amplitude ultrasonic bursts for NDT applications.
  • To assess the potential of the fluidic transducer for advancing industrial ACU implementation.

Main Methods:

  • Development of a novel aeroacoustic source utilizing flow instability in a sonic jet within a bistable fluidic switch.
  • Generation of ultrasonic bursts up to 60 kHz with a mean peak pressure of 320 Pa.
  • Conducting non-contact through-transmission experiments on four different materials using the fluidic transducer and comparing results with conventional transducers.

Main Results:

  • The fluidic ultrasonic transducer successfully generated ultrasonic bursts suitable for NDT tasks.
  • The transducer demonstrated robust operation in environments challenging for conventional equipment.
  • Experiments confirmed the transducer's capability to provide a suitable acoustic signal for non-destructive testing.

Conclusions:

  • The fluidic ultrasonic transducer presents a viable solution for generating high-amplitude ultrasonic signals in ACU.
  • The transducer's robust design and non-contact nature offer significant advantages for industrial NDT applications.
  • This innovation has the potential to accelerate the adoption and implementation of air-coupled ultrasonic testing in various industries.