That fact makes cloaks tricky to design: The waves of sound or light must come back to the detection device -- be it sonar microphones, human eyeballs or radar -- with the same shape and frequency ...

Revealing hidden information in sound waves Date: November 29, 2018 Source: University of Michigan Summary: By essentially turning down the pitch of sound waves, engineering researchers have ...

Sonar technology being tested to see if it can accurately tell where whales are has come under fire from conservationists, who fear it will be used by the Navy to justify wider sonar use.

Sound waves are produced by a vibrating object. ... This technique is applied in sonar systems used to measure the depth of the seabed and to find shipwrecks, submarines and shoals of fish.

STRIKE a metallic object, and you’ll hear a sharp clang. Knock on wood, and you get a dull thunk. It’s the basic principle behind sonar – sound waves reflecting off different objects.

Nano-sonar Uses Electrons To Measure Under The Surface Date: March 2, 2009 Source: Helmholtz Association of German Research Centres Summary: Just as sonar sends out sound waves to explore the ...

The Navy must protect endangered whales from the sound waves caused by underwater sonar blasts during upcoming anti-submarine training off the Southern California coast, a federal appeals court ...

When the scientists want the “autonomous underwater vehicles” to perform a particular task, they send audible sound waves at a level approximating a 120-decibel rock concert.

That's what's in the sonar imaging system in use during the Foss Lake cold-case breakthrough, which was sold by a manufacturer called Humminbird.It uses narrow slices of sound waves to generate a ...

ON THE EDGE Sound waves, shown in red and blue, are confined to the edge of a proposed acoustic topological insulator in these computer simulations.Sound moves counterclockwise from the source and ...

And that is not all: the design also enables the researchers to guide sound waves along a variety of different reconfigurable paths, with minimal loss. According to Alù, the system may find ...