Title :
Ultrasonic densitometer using a multiple reflection technique
Author :
Higuti, Ricardo Tokio ; Adamowski, Julio Cezar
Author_Institution :
Dept. of Electr. Eng., FEIS, Ilha Solteira, Brazil
Abstract :
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 the 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.
Keywords :
acoustic signal processing; density measurement; ultrasonic applications; ultrasonic reflection; ultrasonic transducers; US densitometer; acoustic wave propagation model; chemical resistance; density measurement accuracy; density measurement cell; diffraction effects elimination; double-element transducer; energy method; homogeneous liquids; measurement cell operation; mechanical design; multiple reflection technique; reflection coefficient; robust assembly; signal processing; ultrasonic densitometer; Acoustic measurements; Acoustic noise; Acoustic reflection; Acoustic signal processing; Assembly; Chemicals; Density measurement; Diffraction; Noise robustness; Ultrasonic transducers;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2002.1041543