Sound of accuracy

摘要

Scientists at the National Physical Laboratory (NPL) have developed an acoustic absorber that they claim helps to ensure ultrasound machines used in physiotherapy are emitting an accurate level of power.rnThe polyurethane rubber absorber uses technology derived from that used to line submarines to make them invisible to radar. The flat shape of the device has been designed to 'catch' all the ultrasound beams that spread out from the machine's applicator and give a more accurate reading of the power output compared with existing conical-shaped calibration devices.