working pulse
In pulse-echo working mode, by the modulation of sweeping frequency and trigger delay and performing a digital speckle correlation calculation, it can be obtained point-to-point the vibration frequency, amplitude and phase difference of underwater solid surfaces. Compared with traditional vibration measurement techniques, ultrasonic speckle stroboscopic technique can perform on-line, underwater, noncontact experiments, and is insensitive to the environment and the sample surface roughness. In
this manuscript this technique was applied to a vibrating cantilever underwater. The
experimental results were in good agreement with other testing methods. Therefore, the
noncontact testing technique for vibration coefficient, especially the vibration phase difference, provides an alternative method for the mode analysis of industrial constructions, which is a piece of very important work for industrial underwater structure design.