“…Pulse diagnostic devices in Korea have used piezoelectric devices, 31 , 32 , 33 piezoresistive strain gauges, 34 , 35 , 36 , 37 air-vibration-detecting condenser microphones, 38 , 39 optical fiber transducers that use the reflective optical power change according to infinitesimal displacement, 40 optical fiber coupling controlled by infinitesimal displacement, 41 , 42 optical coherence tomography devices using in-line Michelson interferometers, 43 , 44 , 45 , 46 fiber Bragg gratings, 47 magnetic junction elements, 48 magnetic Hall devices, 49 , 50 , 51 , 52 , 53 , 54 , 55 moving pulse images, 56 , 57 and so on.…”