"PROCEDIMENTO PER GENERARE E/O RICEVERE SEGNALI ULTRASONICI"

• Main Authors: KLAUS ABEND, URSULA ORTHEN
• Format: Patent
• Language: Italian
• Published: 05.02.1982
• Edition: 3
• Subjects: DEAF-AID SETS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; FOR PERFORMING MECHANICAL WORK IN GENERAL; GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; MEASURING; METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICALVIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY; PERFORMING OPERATIONS; PHYSICS; PUBLIC ADDRESS SYSTEMS; TESTING; TRANSPORTING

In a method for generating and/or for receiving ultrasonic signals by using a piezoelectric crystal, a higher resolution, improved location of faults and detection of the type of fault are achieved by arranging for the crystal to be predeformed continuously during measurement by a DC voltage. At the same time, bipolar pulses can be applied to the quartz crystal, resulting, e.g., in a simplification of the frequency analysis and of the phase shift.