Abstract
In this study, refracto-vibrometry is proposed for active control of sound radiation through an opening. First, refracto-vibrometry is used to reconstruct sound field in an opening, and a quantitative comparison of sound fields is made with those obtained from a microphone array at 224 locations. Then, the reconstructed sound field by refracto-vibrometry is used for active noise control. Experimental results indicate that using refracto-vibrometry can obtain about 12.9 dB noise reduction at 500 Hz with no increase in noise observed at higher frequencies above 2 kHz. By offering a significantly larger number of error signals without causing obstructions at an opening, refracto-vibrometry outperforms traditional microphone arrays, making it an effective complementary error sensing method for high frequency noise.
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