Wireless device sends power through armoured doors

"Scientists in the UK have developed technology that allows power to be transmitted wirelessly through several inches of steel.

The developers, at BAE Systems, say the device could be used to send power and communications signals through submarine hulls or armoured doors.

The device uses very high frequency acoustics – essentially converting the signal into sound waves.

The company has started environmental tests on the technology.

These should ensure, it says, that it will be able to survive...