Abstract
New fire prevention technologies have become necessary due to various fire fighting environments. Sound fire extinguishers can be a new alternative technique to suppress fire by using sound characteristics. We have newly proposed a special acoustical lens to improve the sound beam forming of a sound extinguisher. In this paper, the characteristics of the sound beam formed by the special acoustic lens and the sound beam are verified through experiments. While the wind speed was measured in the sound beam, when the reverse phase sound was supplied, the wind speed was lost and the sound amplitude was reduced by about 20 dB, and the sound velocity of the sound beam was measured to move the medium at a constant cycle with a very large pressure change. Also, the sound level on the propagation path was measured to be 4 dB attenuation up to 30 cm, which is 3 times of 10 cm, and it was confirmed that sound energy was effectively transmitted to 70 cm. As a result of this experiment, the special sound lens of the so...
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