Sound emission transducer

• Main Author: CAVALLONI, CLAUDIO
• Format: Patent
• Language: English; French; German
• Published: 27.11.1996
• Edition: 6
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; BASIC ELECTRIC ELEMENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOTDIRECTED TO A PARTICULAR RESULT; DEAF-AID SETS; DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g.ARRANGEMENTS FOR COPYING OR CONTROLLING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; MACHINE TOOLS; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OFPARTICULAR DETAILS OR COMPONENTS; MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES; MEASURING; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; PHYSICS; PUBLIC ADDRESS SYSTEMS; SEMICONDUCTOR DEVICES; TARIFF METERING APPARATUS; TESTING; TRANSPORTING

The invention relates to a sound emission transducer and to a coupling method. The sound emission transducer (1) forms an assembly unit and is especially designed for the measurement of high-frequency sound emissions (up to about 2MHz). It consists of a piezoelectric measuring element (9), a sound transmitting base (8) with a circumferential coupling diaphragm (7) and a cast compound (10) partially enclosing the measuring element (9). A mounting screw (3) is used to fasten the transducer. The coupling diaphragm (7) is located in a step (14) of the housing (2), whose bottom surface (5), in the case of an unstressed diaphragm (7), has a spacing from the object to be measured corresponding to the elongation (s) (15). The coupling of the sound emission transducer (1) to the object to be measured (15) is carried out such that the bottom surface (5) is pressed onto the object to be measured (15) by tightening the screw (3) and is fastened to the object, as a result of which the diaphragm (7) is stressed and the mounting base (8) is coupled to the surface of the object to be measured (15). The invention enables miniaturisation and more efficient production of the transducer and an improvement of the high-frequency sound transmission.