Category: Uncategorized

SECOND ACOUSTICAL CLOAK (2014). Berkeley's acoustic bottle. "“We can also use an acoustic bottle as a cloaking device, re-routing sound waves around an object and then recovering them in their original form, making the object invisible to sonar detection." https://lnkd.in/eN74kab View in LinkedIn

FIRST ACOUSTICAL CLOAK (2014). "Using little more than a few perforated sheets of plastic and a staggering amount of number crunching, Duke engineers have demonstrated the world’s first three-dimensional acoustic cloak. The new device reroutes sound waves to create the impression that both the cloak and anything beneath it are not there." https://lnkd.in/bPE7nGe View in LinkedIn

SOUND CLOAKING. "The acoustic cloaking device works in all three dimensions, no matter which direction the sound is coming from or where the observer is located, and holds potential for future applications such as sonar avoidance and architectural acoustics." https://lnkd.in/bPE7nGe View in LinkedIn

IT'S ALL ABOUT WAVES. "Sound waves move much like light waves. They travel on a straight path but this path – through reflection, diffraction or refraction – can be bent. This is the basis for ultrasound medical imaging and non-destructive testing of materials." https://lnkd.in/eN74kab View in LinkedIn

FRENCH SCIENTISTS "carried out the largest-scale test to date of seismic metamaterials. The reported experimental results are encouraging: an artificial structure built around a target can be used to deflect incoming acoustic waves at a frequency relevant to earthquake protection. This preliminary success in the laboratory could one day translate into a way of mitigating the destructive effects of earthquakes." https://lnkd.in/edaQCe9 View in LinkedIn

FIRST TESTS OF SEISMIC CLOAKING. "An early prototype of such a cloak has been tested experimentally by researchers in France. In principle, the concept could be extended to create protective barriers that divert earthquake energy away from sensitive facilities such as nuclear power plants." https://lnkd.in/e_Auavs View in LinkedIn

SEISMIC CLOAKING. "Vulnerable buildings could someday be shielded from damaging earthquakes by surrounding them with "seismic invisibility cloaks". https://lnkd.in/e_Auavs View in LinkedIn

GIANT PHOTONIC CRYSTALS. "Building on the results obtained in the field of phononic crystals and acoustic metamaterials, theorists have proposed artificial structures, based on periodic arrays of boreholes, that exhibit band gaps at frequencies characteristic of seismic waves." https://lnkd.in/edaQCe9 View in LinkedIn

METAMATERIALS AND WAVES. "Given the similarity between acoustic and seismic phenomena, it was natural to envision that larger-scale analogs of acoustic metamaterials, called seismic metamaterials, could open a new direction in the control of seismic waves and protection from earthquakes." https://lnkd.in/edaQCe9 View in LinkedIn

BENDING WAVES. "In recent years, a number of groups have reported schemes, based on metamaterials made of properly tailored concentric rings, for cloaking objects from elastic bending waves propagating in thin plates." https://lnkd.in/edaQCe9 View in LinkedIn