Pulse compression applied to the signal processing in NDT inspections has shown significant improvement in the signal-to-noise-ratio of the measurements. The sensitivity of ultrasonic phased array measurements is enhanced when combined with pulse compression procedures. In this work, pulse compression has been implemented to linear array transducers, while using frequency modulated, chirp excitation signals. A system of signal generation and acquisition has specifically been designed for the realization of the proposed phased array inspection system based on pulse compression. A reference aluminum sample with known flat bottom holes was inspected with the proposed system. The spatial and lateral resolutions obtained from Sector B-scan images demonstrate the quality of defect detection and characterization.
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