Development of M-sequence Pulse Compression Ultrasonic Transducer by Stacking Piezoelectric Polymer Films

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  • <b>Development of M-sequence Pulse Compression Ultrasonic Transducer </b><b>by Stacking Piezoelectric Polymer Films </b>

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In order to improve the performance in ultrasonic inspections, it is necessary to use an ultrasonic probe with a broad-band and high sensitivity characteristics. Pulse compression techniques using an M-sequence (Maximal length sequence) or a linear frequency modulation (LFM) wave have been reported as a method improving the signal to noise ratio (SNR) and resolution in an ultrasonic testing. However, in order to generate such modulation waves, special apparatuses like an arbitrary waveform generator etc. are needed. In this study, it aimed to develop a novel ultrasonic probe which can generate an M-sequence wave by only a general pulser without such special devices. As a basic study, M-sequence pulse compression (MPC) ultrasonic transducers of 3 bits length and 7 bits length were tried to fabricate using piezoelectric polymer films with a broad-band frequency characteristic. The performance of these transducers has been evaluated by one-dimensional point spread function (1D PSF) in underwater experiments compared with a commercial ultrasonic composite probe. As a result, it was demonstrated that the MPC ultrasonic transducers have the almost same effect as a general pulse compression method and its performance would be improved depending on the bit length of M-sequence.

収録刊行物

  • 実験力学

    実験力学 15 (Special_Issue), s65-s69, 2015

    日本実験力学会

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