Lamb Wave Set

With the set the frequency-dependent propagation velocity (dispersion) of ultrasonic waves in a thin glass plate (Lamb waves) can be measured. The set contains several Lamb wave combinations (LW1-KW7), each consisting of a glass plate and two angle beam delay lines. One of the delay lines is adhered to the glass plate and the other is free. Together with an ultrasonic probe (order no. 10151, 10152, 10154) the delay lines form angle beam probes which allow an oblique ultrasound coupling into the glass plate. The delay line angles and the plate thicknesses are selected in such a way, that in combination with one of the ultrasonic probes Lamb wave modes can be selectively excited and amplified. The group velocity of the excited Lamb wave can be determined by varying the distance between the probes and measuring the associated change of time of flight in the glass plate (transmission measurement).