Artículos de revistas
Ultrasonic densitometer using a multiple reflection technique
Fecha
2002-09-01Registro en:
IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control. New York: IEEE-Inst Electrical Electronics Engineers Inc., v. 49, n. 9, p. 1260-1268, 2002.
0885-3010
10.1109/TUFFC.2002.1041543
WOS:000178071600009
6405339510883203
0000-0003-4201-5617
Autor
Universidade Estadual Paulista (Unesp)
Universidade de São Paulo (USP)
Institución
Resumen
This work presents recent improvements in a density measurement cell with a double-element transducer that can eliminate diffraction effects. A new mechanical design combined with the use of more appropriate materials has resulted in better parallelism between interfaces, more robust assembly, and chemical resistance. A novel method of signal processing, named energy method, is introduced to obtain the reflection coefficient, reducing sensitivity to noise and improving accuracy. The measurement cell operation is verified both theoretically, using an acoustic wave propagation model, and experimentally, using homogeneous liquids with different densities. The accuracy in the density measurement is 0.2% when compared with the measurements made with a pycnometer.