Title : A piezoelectric copolymer probe ABSTRACT : A piezoelectric copolymer ultrasonic probe has been developed. The polymers are based on vinylidene fluoride and show 3 to 5 times the electrical activity of commercially available piezoelectric polymers. This will enable the production of higher frequency, higher resolution ultrasonic inspection transducers. A further embodiment of this transducer technology relates to the use of laser fibre optics to induce ultrasound in the material being inspected.
Title : High temperature ultrasonic transducers Process/prototype
ABSTRACT : High temperature ultrasonic rugged transducers have been developed which are of inorganic construction, cased in stainless steel. They operate at temperatures up to 600 C and are resistant to corrosion and radiation. Applications involve remote imaging, leak detection, gas content monitoring, structural and temperature measurement. CNM : PADGETT, Brian (Mr) POS : Managing Director COR : The Technology Exchange Ltd ADR : Wrest Park CIT : Silsoe POC : MK45 4HS CNY : UNITED KINGDOM (GB) TEL : +44-525-860333 TLX : 825808 AFCERG FAX : +44-525-860664
Title : Innovative transducers for advanced signal processing in ultrasonic inspections
ABSTRACT : The main objective of the project was the development of new inspection techniques based on the use of PVDF probes in intelligent signal processing systems. The transducer probes produced were either single transducer, or linear and 2-dimensional transducer arrays, the latter being mechanically flexible. Improved imaging and defect characterization were pursued, enabling the inspection of curved and complex shaped surfaces. The new inspection techniques should decrease the costs of inspection, enhance its applicability and reliability, and shorten the inspection time. Extensive studies and experiments were effectively conducted and transducer specifications produced. Fabrication and testing of transducers, however, has been limited to single ones. The electronic interfacing of the transducers to standard equipment has been implemented. Pulse shaping (chirp signals) and signal processing (Walsh transform techniques) were successfully implemented. Broadband transducer material should be investigated further including the aspect of flexibility. The possibility of flexible composite material was also considered. PGA : BRITE PTL : INNOVATIVE TRANSDUCERS FOR ADVANCED SIGNAL PROCESSING RPG : RI1B190 MCO : SIEMENS AG E 211 CNM : VON BERNUS, L (Dr) DEP : KWU NPP2 COR : Siemens AG ADR : Hammerbachterstrasse 12-14 CIT : Erlangen REG : Erlangen, krfr.St. POC : 91058 CNY : GERMANY (DE) TEL : +49-9131-182953 TLX : 629299 FAX : +49-9131-185315
Rolf Diederichs 01. May 1996, info@ndt.net