作者: Carl Kretz
DOI:
关键词: Ultrasonic sensor 、 Acoustics 、 Geology 、 Beam (structure) 、 Sound (geography) 、 Section (archaeology) 、 Head (vessel) 、 Transducer 、 Echo (computing) 、 Optics 、 Signal
摘要: Focussing sound transducer head comprise at least one focussing for transmitting ultrasonic pulses to form a focussed beam having relatively constricted depth zone, in which the is narrower than that would be transmitted by nonfocussing otherwise comparable transmits said beam, and deriving echo signals from echoes generated response pulses. A scanning mechanism moves across section surface an object examined. Display controls are adapted receive cause displayed on fluorescent screen locations geometrically coordinated with corresponding have originated surface. Zone operable control position of length zone such manner plurality zones successively obtained different signal selecting apparatus deliver display means only derived zones.