06202494 is referenced by 75 patents and cites 17 patents.

Measurement of density and mass flow of disperse systems with a gas as fluid phase flowing through a pipe is carried out by introducing sound in the frequency range 20-2,000 Hz in the middle of the cross-section of the pipe. The sound has a wavelength which is at least half the pipe diameter. The speed propagation of sound waves in the flowing disperse system is is measured in the axial direction of flow over at least two transit sections of differing length; and the speed propagation of sound waves in the flowing disperse system is also measured in a direction contrary to the axial direction of flow over at least two transit sections of differing length. The fill level of a reception member in communication with a line of the disperse system is calculated from the measured mass flow rate over a period of time.

Title
Process and apparatus for measuring density and mass flow
Application Number
9/84970
Publication Number
6202494 (B1)
Application Date
May 28, 1998
Publication Date
March 20, 2001
Inventor
Peter Khatchikian
Cottbus
US
Ulrich Riebel
Briesen
US
Agent
Smith Gambrell & Russell
US
Assignee
Degussa Huls Aktiengesellschaft
US
IPC
G01F 1/74
View Original Source