5. New Techniques and Phenomena
The dispersion relation and the propagational speeds of waves in dispersive solids are determined by a newly developed technique in which the phase function of spectral analyzed broadband pulses is determined. The method is simpler than and in agreement with the continuous wave-resonance technique. Application is made to ultrasonic pulses propagating in fiber-reinforced composite materials and other dispersive wave propagation situations.
Sachse, Wolfgang, "Measurement of Phase and Group Velocities of Dispersive Waves in Solids" (1978). Proceedings of the ARPA/AFML Review of Progress in Quantitative NDE, September 1976–June 1977. 24.