Pipe organ air-coupled broad bandwidth transducer

Botong Zhu, B. Tiller, James Windmill, Anthony Mulholland, A.J. Walker

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)


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.
Original languageEnglish
Title of host publicationIEEE International Ultrasonics Symposium, Washington, United States, 6/09/17
Publication statusPublished - 6 Sep 2017


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