Sound waves can be focused using both reflection and refraction techniques, similar to light. Convex lenses converge sound waves, while concave lenses diverge them due to the higher speed of sound in solids compared to air. Parabolic mirrors are particularly effective for focusing sound, as demonstrated by the parabolic dishes at the Sci-Port science center in Shreveport, Louisiana, which allow clear communication across distances. Acoustic lenses, such as tunable acoustic gradient index lenses, can also be utilized for specific applications, including sound energy transfer to diaphragms.
PREREQUISITESAcoustic engineers, physicists, educators in sound technology, and anyone interested in the practical applications of sound wave manipulation.
dauto said:Don't worry. The phases will be the same.
Drakkith said:In Shreveport Louisiana they have the "Sci-Port" science center. One of the displays they have involves to large parabolic dishes about 6 feet in diameter placed about 20 feet apart. If you and a friend stand in front of each dish, you can speak in a normal voice and clearly hear the other person even across the room thanks to the dishes focusing the sound waves.
sophiecentaur said:I had two 1.2m dishes on opposite walls of my School lab for a few years. Good for sound / ultrasound and microwave experiments. Also very unnerving to walk through some random point in the room and hear some kids voice, loud and right in my ear - they don't only work on - axis.