You're here: My Science Blogging » Discovery » Article: Battlefield Stethoscope Can Work In Intensely Noisy Environments
Yessi Pratiwi — September 4, 2007 / 6:53 pm
Life Science reported, U.S. Army acoustical engineers have developed a new stethoscope that can outperform its electronic predecessors by detecting a human heartbeat in intensely noisy environments, such as inside a military helicopter.
This stethoscope designed to work in noise levels of 95 decibels and above - comparable to those that inside a helicopter, an airplane or on the battlefield itself. Background noise on ambulances, helicopters or within crowds typically render electronic and traditional stethoscopes useless. But for the new device to work, researchers must ensure it does not generate emissions through the ultrasound waves that affect aircraft or other equipment.
Unlike others before it, the new stethoscope has a special head that can generate ultrasound waves, or sound frequencies that can cancel out external noises as high as 120 decibels. The materials used in this designed allows only sound waves of a certain amplitude and frequency to pass. Other sounds, including louder ones, are simply blocked. Of course then, only sounds related to breathing and the heart are transmitted into the medic’s ears.
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