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
Cell reselection and handover with multimedia broadcast/multicast service
Configurable caged ball insert for a downhole tool
Externally gapped line arrester
Method for detecting directions of regularity in a two-dimensional image
Stool
Method and apparatus for distributing promotional materials
Sponge
  Randomly Featured Patents
Sheet thickness monitoring system and method
Mobile telephone handset
Independent light replacement for vehicle
Initializing decoding metrics
Method of assigning available resources for internal and external users at start time of scheduled time period based on program reservations information
Securing device for an intake tube of an internal combustion engine
Manufacturing method for display device having thickness of first substrate reduced by second supporting substrate and then adhering third substrate with parallax optic to thinned first substr
Method and system for component positioning during assembly of scroll-type fluid machine
Heuchera plant named `Silver Light`
Automatically switched redundant switch configurations