NDLI: Parameter reproducibility of polypropylene ferroelectret transducers for air-coupled ultrasonic testing

Content Provider	IEEE Xplore Digital Library
Author	Gaal, M. Doring, J. Bartusch, J. Beck, U. Weise, M. Bovtun, V. Brekow, G. Kreutzbruck, M.
Copyright Year	2011
Description	Author affiliation: BAM - Fed. Inst. for Mater. Res. & Testing, Berlin, Germany (Gaal, M.; Doring, J.; Bartusch, J.; Beck, U.; Weise, M.; Bovtun, V.; Brekow, G.; Kreutzbruck, M.)
Abstract	The extremely low acoustic impedance of polypropylene ferroelectret combined with its piezoelectric properties makes this material suitable for construction of air-coupled ultrasonic transducers for non-destructive testing. For the fabrication of transducers with a stable quality, the reproducibility of their key parameters is of interest. The reproducibility was evaluated by means of (i) impedance spectroscopy and (ii) pulse-echo measurements. (i) Impedance spectroscopy was applied to identify the resonance frequency, the coupling factor and the acoustic impedance of several nominally identical transducers. (ii) Pulse-echo measurements yielded the signal form of these transducers. The variation of the signal amplitude measured with pulseecho technique was about 10 dB. A part of this variation comes from the deposition of transducer electrodes and another part from local variations of ferroelectret properties. The variation of the signal amplitude was caused by the observed variation of the coupling factor, which was also about 10 dB. The variation of the acoustic impedance was only about 1 dB, thus having no effect on the variation of the signal amplitude. These results indicate that the variability can be reduced by improving the control of electrode deposition and by optimizing the production technology affecting the reproducibility of material properties.
Sponsorship	IEEE Ultrasonics, Ferroelectrics Frequency Control Soc.
Starting Page	1673
Ending Page	1675
File Size	418719
Page Count	3
File Format	PDF
ISBN	9781457712531
ISSN	19485727
e-ISBN	9781457712524
DOI	10.1109/ULTSYM.2011.0416
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-10-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Acoustics Transducers Impedance Couplings Materials Acoustic measurements Electrodes reproducibility air-coupled ultrasonic transducers polypropylene ferroelectret
Content Type	Text
Resource Type	Article

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