1LYNNWORTH L C, LIU Y. Ultrasonic flowmeters : Half- century progress report, 1955-2005 [ J ]. Ultrasonics, 2006,44 : 1371-1378.
2MAHADEVA D V, BAKER R C, WOODHOUSE J. Fur- ther studies of the accuracy of clamp-on transit-time ultra- sonic flowmeters for liquids [ J ]. Instrumentation and Measurement, 2009, 58(5): 1602-1609.
3QUEIROS R, ALEGRIA F C, GIRAO P S, et al. Cross- correlation and sin-fitting techniques for high-resolution ultrasonic ranging[J]. IEEE transactions on instrumenta-tion and measurement, 2010, 59 (12) :3227-3236.
4BRIAN J T,AARON A D, BRIAN A E. Advanced ultra- sonic measurement methodology for non-invasive interro- gation and identification of fluids in sealed containers [ J]. Nonintrusive Inspection, Structure Monitoring, and Smart Systems for Homeland Security, 2006, 6178: 61780K. 1-61780K. 12.
5BRASSIER P, HOSTEN B, VULOVIC F. High-frequen- cy transducer and correlation method to enhance ultrason- ic gas flow metering [ J ]. Flow Measurement and Instru- mentation, 2001, 12 ( 1 ) :201-211.
6MARIO K, EDWIN K, MARTIN G. Absolute transit time detection for ultrasonic gas flowmeters based on time and phase domain characteristics [ C ]. Ultrasonic Symposium, IEEE. New York,USA,2007 : 142-145.
7EMMANUELLE M, DENIS K, JEAN-PIERRE R. Meth- odology for developing a high-precision ultrasound flow meter and fluid velocity profile reconstruction [ J ]. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequen- cy Control, 2008, 55 (1) :161-172.
8SVILAINIS L, DUMBRAVA V. Analysis of the interpo- lation techniques for time-of-flight estimation [ J ]. Ultra- garsas ( Ultrasound), 2008,63 (4) : 25-29.
9WIENS T, BRADLEY S. A comparison of time delay es- timation methods for periodic signals [ J ]. Digital Signal processing, 2009,17 : 1 - 15.
10VIOLA F, WALKER W F. A spline-based algorithm for continuous time-delay estimation using sampled data[ J ]. IEEE Transactions on Ultrasonic, Ferroelectrics, and Frequency Control, 2005,52 ( 1 ) : 80-93.
