Passage Time Measurement of Medium Probe Signal with the Use of Phase Method with Quasi-Continuous Wave

ln the paper we discuss the passage time measurement method of medium probe signal based on the analysis of phase of acoustic bulk waves. The application to be presented uses rwo quasi-continuous acoustic waves with different frequencies. The measurement process is based on low-frequency signal sampling and then a computer data processing uses an apropriate calculation algorithm. Although, the method hasn't been practicaly verified completely, the preliminary researches and computer simulations show that it is possible to measure the time with resolution lower then 0.01 of probe wave period, what gives almost equal to 5ns with working frequency equal to l,4(6)MHz.