Comparison between surface impulse ground penetrating radar signals and ultrasonic time-of-flight diffraction signals

Surface impulse ground-penetrating radar (GPR) and ultrasonic time-of-flight diffraction (TOFD) are recent innovations in the respective geophysical remote sensing and non-destructive testing industries. Both techniques have proved highly versatile and valuable applications. This paper provides a brief description of the time-of-flight diffraction (TOFD) signals and the surface impulse ground penetrating radar (GPR) signals. The similarities between the two techniques are highlighted and it is shown how processing techniques developed for GPR data processing may be adapted for use with TOFD data.