Pipe organ air-coupled broad bandwidth transducer

Zhu, B. and Tiller, B. and Windmill, J.F.C. and Mulholland, A.J. and Walker, A.J. (2017) Pipe organ air-coupled broad bandwidth transducer. In: 2017 IEEE International Ultrasonics Symposium, IUS 2017, 2017-09-06 - 2017-09-09.

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    Abstract

    Air-coupled transducers are used to conduct fast non-contact inspections in NDT. Normally, the bandwidth of a conventional transducer can be enhanced, but with a cost to its sensitivity. However, low sensitivity is very disadvantageous in air-coupled devices. This paper presents a methodology for improving the bandwidth of an air-coupled micro-machined ultrasonic transducer (MUT) without sensitivity loss by connecting a number of resonating pipes of various length to a cavity in the backplate. The design is inspired by the pipe organ musical instrument, where the resonant frequency (pitch) of each pipe is mainly determined by its length.

    ORCID iDs

    Zhu, B. ORCID logoORCID: https://orcid.org/0000-0003-1096-3233, Tiller, B., Windmill, J.F.C. ORCID logoORCID: https://orcid.org/0000-0003-4878-349X, Mulholland, A.J. ORCID logoORCID: https://orcid.org/0000-0002-3626-4556 and Walker, A.J.;