16 May 2018 Digital holographic sound imaging for frequency estimation of piezoelectric vibrator
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Abstract
Digital holography (DH) has been used for sound field imaging and visualization in which phase retarded object wave due to sound wave propagation in the region is recorded and temporal phase profile as sound data is obtained. Based on this characteristics of DH, we present frequency estimation system for vibrating objects such as piezoelectric vibrator. The method employed an off-axis DH geometry where object wave passes near to vibrating object, which superimpose with reference wave. The interference patterns are recorded in digital holograms using high speed image sensor as function of time. Finally, to estimate vibration frequency of piezoelectric vibrator, Fresnel reconstruction of free space propagation and some acousto-optic data processing techniques have been used. The method can detect the frequencies of piezoelectric vibrator with high accuracy. We presents experimental results for estimation of vibration frequency of piezoelectric vibrator.
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Sudheesh K. Rajput, Sudheesh K. Rajput, Osamu Matoba, Osamu Matoba, } "Digital holographic sound imaging for frequency estimation of piezoelectric vibrator ", Proc. SPIE 10666, Three-Dimensional Imaging, Visualization, and Display 2018, 1066617 (16 May 2018); doi: 10.1117/12.2305494; https://doi.org/10.1117/12.2305494
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