Moire processing of acoustic field holograms

A moiré method for processing optical image-plane holograms of acoustic fields is introduced. Derivatives of acoustic pressure with respect to space, time and other system variables can be obtained by this extension of holographic interferometry methods. The new method is employed to obtain simultaneous, independent measurements of acoustic pressure and particle acceleration. It is also demonstrated that moiré processes can improve the sensitivity of optical, whole field measurements at least 30 times.