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Frequency Spectrum of Laser Ultrasonic Signals from Fibers and Particles Suspensions

Zhao Z., Törmänen M., Myllylä R.

Molecular and Quantum Acoustics

2006

Vol. 27

319-326

This paper studied fiber and particle suspensions using pulsed laser-induced ultrasonic waves. By analyzing the power spectrum of these wide frequency ultrasonic waves propagating through different suspensions, the paper demonstrates that acoustic attenuation caused by fibers has a larger effect on high frequency than on low frequency components. Since this phenomenon was not observed in solutions containing fines and particles, it is useful for determining a solution's fiber consistency and for measuring fiber and fines fractions in paper pulp. Moreover, the experiment also showed that, relative to measuring attenuation amplitude, the measured power spectrum is less affected by fiber flock, micro air bubbles, acoustic coupling and temperatures.

Pulsed Photoacoustic Investigations in Liquid and Tissue

Zhao Z., Myllylä R.

Molecular and Quantum Acoustics

2002

Vol. 23

451-462

This paper focuses on pulsed photoacoustic (PA) generation on liquid and tissue by the thermal elastic mechanism. The paper first provides a theoretical presentation of PA amplitude, waveshape and optical scattering. Then a set of experiments is carried aut to demonstrate the presented amplitude expressions and to give a qualitative explanation of waveshapes. Finally, the paper introduces an application based on the pulsed PA technique for the determination of glucose in human blood.