According to the above method, depending on a combination of {TAIL ~ transmission elements} for ultrasonic wave transmission, it is possible to change {HEAD ~ the detection area} of the ultrasonic wave 
According to the above method , depending on a combination of { TAIL ~ transmission elements } for ultrasonic wave transmission , it is possible to change { HEAD ~ the detection area } of the ultrasonic wave
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH