Laser optoacoustic measurements of paper porosity

A. A. Karabutov; I. M. Pelivanov; N. B. Podymova

doi:10.1117/12.674995

9 June 2006 Laser optoacoustic measurements of paper porosity

A. A. Karabutov, I. M. Pelivanov, N. B. Podymova

Proceedings Volume 6162, International Conference on Lasers, Applications, and Technologies 2005: Laser Sensing, Imaging, and Information Technologies; 61620H (2006) https://doi.org/10.1117/12.674995
Event: International Conference on Lasers, Applications, and Technologies 2005, 2005, St. Petersburg, Russian Federation

Abstract

Propagation of wide-band ultrasonic pulses in liquid-saturated printed paper samples of a various porosity soaked with liquids is studied. Three types of paper are used in experiments: "Zoom ultra" (Stora Enso, Finland) with surface specific gravity of 80 g/m² and 100 g/m² and "Data copy" (Mo Do, Sweden) with the surface specific gravity of 160 g/m². Two types of liquids (ethanol and transformer oil) are utilized for soaking of paper samples. The method of laser optoacoustic spectroscopy is employed both for excitation of ultrasonic pulses and its registration with a high temporal resolution. The phase velocity of ultrasound is measured in the frequency range of 5÷35 MHz for all types of paper samples. The absence of an appreciable frequency dispersion of the ultrasound phase velocity is proved in this frequency range. The possibility of the porosity measurement of paper based both on the theory of ultrasound propagation in a two-phase medium and the ultrasonic experimental data is demonstrated.

Citation Download Citation

A. A. Karabutov, I. M. Pelivanov, and N. B. Podymova "Laser optoacoustic measurements of paper porosity", Proc. SPIE 6162, International Conference on Lasers, Applications, and Technologies 2005: Laser Sensing, Imaging, and Information Technologies, 61620H (9 June 2006); https://doi.org/10.1117/12.674995

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