Abstract
Ultrasonic transducers for NDE applications are commonly based on Lead Zirconate Titanate or PZT, an inorganic compound and ceramic perovskite material. Usually these conventional transducers are fabricated in piezo-composite technology in order to adapt the acoustic impedance of the active element to the specific material under test. For applications with low signal amplitudes, high electronic noise and small transducer elements, the performance of ultrasonic probes can be significantly enhanced by using Lead Magnesium Niobate-Lead Titanate (PMN-PT) instead of PZT. This single-crystal material offers significantly better piezo parameters and leads to a higher sensitivity and larger bandwidth. Similar to PZT it can also be fabricated in 1-3 piezo-composite technology. In a cooperation between Fraunhofer IKTS and Ibule Photonics, PMN-PT ultrasonic transducers are developed and optimized. As a result various single element and phased array transducers with improved performances are available. In the present paper several PMN-PT probes are presented and compared with identically constructed PZT transducers. Moreover, a short outlook to the next generation PIN-PMT-PT (lead indium niobate-lead magnesium niobate-lead titanate) NDE probes is given.
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