Review of Digital Holographic Sound-Field Imaging Measurement Technology(Invited)
Sound-field measurement technology is an important means of studying and evaluating acoustic phenomena as it clarifies the distribution and propagation laws of sound in space.By measuring various parameters such as sound pressure in the sound field,researchers can study the propagation characteristics and quality of sound as well as the interaction of sound waves in a specific environment.Compared to traditional sound-field measurement technology,digital holographic sound-field measurement technology converts the pixel points of a camera into high-precision sensors,exploits the interference principle to record the hologram created by the sound field,and digitally recovers the phase information of the light field modulated by the sound field.These processes quantitatively reconstruct an image of the sound field using acousto-optic effects.The real propagation characteristics of sound waves in the medium can be noninvasively viewed as a video with a full field of view and high spatial resolution.This review focuses on the basic principles of digital holographic sound-field measurement technology,conventional measurement methods,sound-field phase reconstruction methods,and the application prospects of digital holography technology in sound-field measurements.
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