The use of air-coupled ultrasound to test paper

Author

McIntyre, Craig S. ; Hutchins, David A. ; Billson, Duncan R. ; Stor-Pellinen, Jyrki

Author_Institution

Sch. of Eng., Warwick Univ., Coventry, UK

Volume

48

Issue

3

fYear

2001

fDate

5/1/2001 12:00:00 AM

Firstpage

717

Lastpage

727

Abstract

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.

Keywords

acoustic resonance; capacitive sensors; inspection; moisture measurement; paper; paper industry; thickness measurement; ultrasonic materials testing; US signal transmission; air-coupled ultrasound; capacitance transducers; cardboard; inspection; moisture content; normal incidence; paper products; paper testing; resonance; sample thickness; structure changes; thin polymer membrane; Biomembranes; Capacitance; Frequency; Moisture; Paper products; Polymers; Resonance; Testing; Ultrasonic imaging; Ultrasonic transducers;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/58.920699

Filename

920699