The most commonly used stethoscopes in clinics nowadays are the acoustic stethoscopes. They operate on the transmission of sound from the chest piece, via air-filled hollow tubes, to the ears of the healthcare worker. However, even for very experienced healthcare workers, the accuracy of diagnosis of heart murmurs with acoustic stethoscope is limited by the poor ability of the human ears to low frequency heart sounds. This is important, as valuable information from subaudio sounds is present at frequencies below the human hearing range. Thus, the follow-up in-depth tests are needed in order to further distinguish different types of hear murmurs. In this paper, we report the development of a new type of stethoscope using laser technology to make the heartbeat signal “visible.” In this laser-based-stethoscope, the heartbeat signal is correlated with the optical spot from a laser beam reflected from...

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