[Development of an optical transducer for precordial low-frequency vibration measuring system].
D000328:Adult; D006321:Heart / Q000502:physiology; D006331:Heart Diseases / Q000175:diagnosis*; D006801:Humans; D007834:Lasers; D008297:Male; D010507:Periodicity; D013909:Thorax / Q000502:physiology*; D014159:Transducers; D014732:Vibration