Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Optical flow rate measurement using unsteady pressures










Image Number 11 for United States Patent #6536291.

A fiber optic strain gauge based flow rate measurement system includes two measurement regions located an average axial distance .DELTA.X apart along the pipe, the first measurement region having two fiber optic strain gauges located a distance X.sub.1 apart, and the second measurement region having two other fiber optic strain gauges located a distance X.sub.2 apart, each capable of measuring the unsteady pressure in the pipe 12. Signals from each pair of fiber optic strain gauges are differenced by summers to form spatial wavelength filters. Each spatial filter filters out acoustic pressure disturbances P.sub.acoustic and other long wavelength pressure disturbances in the pipe and passes short-wavelength low-frequency vortical pressure disturbances P.sub.vortical associated with the vortical flow field. The spatial filters provide signals to band pass filters that filter out high frequency signals. The P.sub.vortical -dominated filtered signals from the two sensing regions are cross-correlated to determine a time delay .tau. between the two sensing locations which is divided into the distance .DELTA.X to obtain a convection velocity U.sub.c (t) that is related to an average flow rate of the fluid (i.e., one or more liquids and/or gases) flowing in the pipe 12. The invention may also be configured detect the velocity of any desired inhomogeneous pressure field in the flow.








 
 
  Recently Added Patents
Determining phase-specific parameters of a physiological variable
Luggage cart
Method of forming micropattern, method of forming damascene metallization, and semiconductor device and semiconductor memory device fabricated using the same
Structure of circuit board and method for fabricating the same
Complete context search system
Method of requesting CQI reports
Categorizing bit errors of solid-state, non-volatile memory
  Randomly Featured Patents
Process
Exciter current line in the rotor of an electric machine
Flashlight
Multi-bit data memory system and read operation
Techniques for optimizing data migration
Electronic device for blocking telephone calls
Disk drive having a top cover with anchor tabs
Apparatus for making electronically-produced postcards and method of operating same
Integrated component mounting system
Print engine productivity module inverter