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Convolution of Barker and Mutually Orthogonal Golay Complementary Codes for Ultrasonic Testing.

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Ultrasonic testing (UT) faces challenges with signal attenuation. A new Barker-convolved mutually orthogonal Golay complementary code (BMOGCC) enhances signal energy and efficiency in nondestructive testing (NDT).

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Area of Science:

  • Materials Science
  • Acoustics
  • Nondestructive Testing

Background:

  • Ultrasonic testing (UT) is crucial for material integrity assessment but struggles with signal attenuation in certain materials.
  • Conventional excitation signals in UT often have low energy and poor interpretability due to attenuation.
  • Existing coded excitation methods like Barker codes and complementary Golay codes (CGC) have limitations in sequence length or time efficiency.

Purpose of the Study:

  • To introduce a novel coded excitation technique, the Barker-convolved mutually orthogonal Golay complementary code (BMOGCC).
  • To address the limitations of existing methods by combining the benefits of Barker codes and mutually orthogonal Golay complementary codes (MOGCC).
  • To evaluate the performance of BMOGCC for ultrasonic testing applications.

Main Methods:

  • Developed the Barker-convolved mutually orthogonal Golay complementary code (BMOGCC) by convolving Barker codes with MOGCC.
  • Conducted numerical simulations and laboratory experiments to assess BMOGCC performance.
  • Evaluated key performance indices: peak sidelobe level (PSL), mainlobe gain (MG), and temporal resolution.

Main Results:

  • BMOGCC demonstrated significantly higher mainlobe gain (MG) compared to standalone Barker codes or MOGCC.
  • The proposed method maintained a low peak sidelobe level (PSL).
  • BMOGCC preserved the temporal resolution of the ultrasonic testing signals.

Conclusions:

  • BMOGCC effectively enhances signal energy and signal-to-noise ratio in ultrasonic testing.
  • The novel code offers improved time efficiency compared to conventional methods like CGC.
  • BMOGCC presents a promising solution for improving signal quality and measurement efficiency in nondestructive testing.