The use of air-coupled ultrasound to test paper

Capacitance transducers containing a thin polymer membrane have been used to transmit ultrasonic signals with frequencies in excess of 1 MHz through various paper products such as paper and cardboard. At normal incidence, a resonance was visible in thicker samples, the frequency of which could be co...

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Veröffentlicht in:	IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2001-05, Vol.48 (3), p.717-727
Hauptverfasser:	McIntyre, C.S., Hutchins, D.A., Billson, D.R., Stor-Pellinen, J.
Format:	Artikel
Sprache:	eng
Schlagworte:	Acoustic instruments, equipment, and techniques Acoustical measurements and instrumentation Acoustics Biomembranes Capacitance Cardboard Correlation Exact sciences and technology Ferroelectric materials Frequency Fundamental areas of phenomenology (including applications) General equipment and techniques Instruments, apparatus, components and techniques common to several branches of physics and astronomy Moisture Moisture content Paper products Physics Polymers Resonance Testing Transducers Ultrasonic imaging Ultrasonic transducers Ultrasonics, quantum acoustics, and physical effects of sound Ultrasound
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Beschreibung
Zusammenfassung:	Capacitance transducers containing a thin polymer membrane have been used to transmit ultrasonic signals with frequencies in excess of 1 MHz through various paper products such as paper and cardboard. At normal incidence, a resonance was visible in thicker samples, the frequency of which could be correlated to parameters such as the thickness of the paper sample and the moisture content. It has also been demonstrated that images can be obtained of changes in structure across paper and card samples.
ISSN:	0885-3010 1525-8955
DOI:	10.1109/58.920699