Verification of measurement possibilities of quasi-continuous acoustic wave packets for technical and medical applications

• Autorzy: Szustakowski M. , Jodłowski L. , Piszczek M.
• Języki publikacji: EN

Abstrakty

EN

Quasi-continuous acoustic wave packets are used for investigations of real objects due to determination of their material parameters such as, for example, propagation velocity of an acoustic wave, or localisation of their inner structures. Application of low sampling frequencies (500kHz) in comparison with the strict harmonic probing signals ~1.5MHz offers very promising measuring possibilities (detection of the transit time changes of acoustic signal ?5ns). This paper shows the test measurement results for a glass vessel (300mm probing path in distilled water) and patients with pathological changes (ischemia and internal haemorrhage in the brain tissue) using the phase and time methods. High sensitivity of measurements ensures detection of differences in density of the order of ~3ź10-3kg/m3, propagation velocity of acoustic wave ~4ź10-2m/s, temperature ~1.5ź10-2K and change of the acoustic path ~4žľm. Sensibility and simplicity of the measuring system makes the proposed solution a very attractive tool for investigations. It can be applied for measurement of different changes of the material properties in the automatic systems and medicine.

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Polska Akademia Nauk
• Czasopismo: Archives of Acoustics
• Rocznik: 2001
• Tom: Vol. 26, no. 2
• Strony: 133--141
• Opis fizyczny: Bibliogr. 4 poz., rys., tab.

Twórcy

autor

Szustakowski M.

• Military University of Technology, Institute of Optoelectronics

autor

Jodłowski L.

• Military University of Technology, Institute of Optoelectronics

autor

Piszczek M.

• Institute of Fundamental of Electronics

Bibliografia

• 1. L. Jodłowski, Measurement of harmonic signal phase using low sampling frequency, 27th Winter School on Molecular and Quantum Acoustics, Ustroń 23-27.02.1998.
• 2. M. Szustakowski, L. Jodłowski and M. Piszczek, Measurements of changes of phase velocity in a fluid using digital signal processing, 27th Winter School on Molecular and Quantum Acoustics, Ustroń, Feb. 1998.
• 3. M. Szustakowski, L. Jodłowski and M. Piszczek, First experience by using ultrasound in measurement of change brain density, 1st INTERDISCIPLINARY FORUM OF STROKE   conference materials, Wrocław, September 1998.
• 4. M. Szustakowski, L. Jodłowski and M. Piszczek, Passage time measurement of medium probe signal with the use of phase method with quasi-continuous wave, 28th Winter School on Molecular and Quantum Acoustics. Ustroń, Feb. 1999.