Vol.1, No 4, 1999 pp. 51 - 54
UDC 534.873

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SPECIFIC FEATURES OF USING PIEZOCERAMIC TRANSDUCERS FOR UNDERWATER NOISE MEASUREMENTS
Tihomir Trifonov
Vassil Levski Land Forces Academy, Faculty of Communication and Information Systems, Dep. of  Radioelectronics, 5007 Veliko Turnovo, Bulgaria

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Abstract. Most sonar listening systems operate od a lw frequency range. Piezoceramic transducers often are chosen for their antenna grids, since they can be made relatively simply, to fulfill requirements of ruggendess and efficiency and because they can be used to cover a wide frequency band. The highest sensitivity and efficiency and the smallest size of the transducer is obtained when its active element excites bending modes. In the presented paper three types of transducers are investigated - bimorph, trimoph and cymbal type. Their fundamental features are described.
Key words: piezoceramic transducer, sonar system, underwater noise

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SPECIFIČNE KARAKTERISTIKE KORIŠĆENJA PIEZOKERAMIČKIH PRETVARAČA
ZA MERENJE ŠUMA POD VODOM Veliki broj prislušnih sistema radi na niskim frekvencijama. Piezokeramički pretvarači se često koriste za njihove antenske rešetke, jer se mogu relativno prosto napraviti da ispune zahteve efikasnosti i jer mogu da pokriju širi frekvencijski opseg. Najveća osetljivost i efikasnost i najmanja veličina pretvarača dobija se kada njihov aktivni element pobuđuje bending modove. U prezentiranom radu istraživana su tri tipa pretvarača - bimorfni, trimorfni i cimbalni tip. Opisane su njihove osnovne osobine.