ULTRASONIC ECHO SOUNDER TRANSDUCER AND ULTRASONIC FLOW METER EQUIPPED WITH SAME

• Main Authors: ADACHI, AKIHISA, FUJII, YUJI, WATANABE, AOI, NAGAHARA, HIDETOMO, SATOU, MASATO
• Format: Patent
• Language: English; French; German
• Published: 22.07.2015
• Subjects: ACOUSTICS; ACOUSTICS NOT OTHERWISE PROVIDED FOR; DEAF-AID SETS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; FOR PERFORMING MECHANICAL WORK IN GENERAL; GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; MEASURING; MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL; METERING BY VOLUME; METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICALVIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; MUSICAL INSTRUMENTS; PERFORMING OPERATIONS; PHYSICS; PUBLIC ADDRESS SYSTEMS; SOUND-PRODUCING DEVICES; TESTING; TRANSPORTING

An ultrasonic transducer (5, 6, 30) comprises a metal plate (16, 31); an acoustic matching member (15) fastened to one of surfaces of the metal plate, a piezoelectric substrate (17) which is fastened to the other surface of the metal plate and generates a vibration; and an insulating damping member (11, 20) covering a surface of the piezoelectric substrate which surface is on an opposite side of a surface fastened to the metal plate; wherein a thickness of the insulating damping member is set to a length which is n/2 of a wavelength of the vibration propagating through the insulating damping member.