Abstract
A measuring system, based on TV holography and image processing, that is used for full field mapping of surface displacements of underwater acoustic transducers is described. In the technique’s normal operation mode, the time-averaged recording, a realistic amplitude detection range in water is from about λ/5 to 2.5λ, where λ is the wavelength of the applied laser light. Combined with sinusoidal phase modulation and discrete vibration phase shifts, the system provides numerical phase and amplitude values of sinusoidally vibrating transducers. This combined technique has an amplitude detection range in water from about λ/1000 to λ/10. Results are presented of single-element and array transducers in active and passive mode, both as ordinary time-averaged fringe patterns and as numerical phase and amplitude maps. The transducers vibrated in a frequency range of 20–250 kHz.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call