Science Alert September 4, 2021
An international team of researchers (Switzerland, UK) has achieved active acoustic cloaking and holography without prior knowledge of the wavefield so that objects remain invisible and illusions remain intact even for broadband moving sources. In the new approach, there’s a lot more versatility in making objects disappear – and it can even work the other way around to make it sound as if a non-existent object is taking up space in the room. FPGAs can respond to the audio speaker outputs with virtually no delay at all. So far, the researchers have managed to get their system working for 2D objects up to 12 centimeters in size. The team expects to be able to scale up the system to work with 3D objects that can be much larger in size and make it function across a wide frequency range. It can be used in the study of underground structures and in the future underwater…read more. Open Access TECHNICAL ARTICLEÂ
Simulations demonstrating active cloaking and holography. Credit: Science Advances, 10 Sep 2021, Vol 7, Issue 37Â