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1. CA2715504 - FLOW VELOCITY AND PRESSURE MEASUREMENT USING A VIBRATING CANTILEVER DEVICE

Office
Canada
Application Number 2715504
Application Date 31.01.2008
Publication Number 2715504
Publication Date 21.08.2008
Grant Number
Grant Date 18.08.2015
Publication Kind C
IPC
G01L 9/00
GPHYSICS
01MEASURING; TESTING
LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
9Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
CPC
G01F 1/20
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
1Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
05by using mechanical effects
20by detection of dynamic effects of the fluid flow
G01F 1/32
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
1Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
05by using mechanical effects
20by detection of dynamic effects of the fluid flow
32by swirl flowmeter, e.g. using Karman vortices
G01L 9/0011
GPHYSICS
01MEASURING; TESTING
LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
9Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements
0001Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means
0008using vibrations
001of an element not provided for in the following subgroups of G01L9/0008
0011Optical excitation or measuring
G01Q 30/14
GPHYSICS
01MEASURING; TESTING
QSCANNING-PROBE TECHNIQUES OR APPARATUS; APPLICATIONS OF SCANNING-PROBE TECHNIQUES, e.g. SCANNING PROBE MICROSCOPY [SPM]
30Auxiliary means serving to assist or improve the scanning probe techniques or apparatus, e.g. display or data processing devices
08Means for establishing or regulating a desired environmental condition within a sample chamber
12Fluid environment
14Liquid environment
G01Q 40/00
GPHYSICS
01MEASURING; TESTING
QSCANNING-PROBE TECHNIQUES OR APPARATUS; APPLICATIONS OF SCANNING-PROBE TECHNIQUES, e.g. SCANNING PROBE MICROSCOPY [SPM]
40Calibration, e.g. of probes
G01Q 60/38
GPHYSICS
01MEASURING; TESTING
QSCANNING-PROBE TECHNIQUES OR APPARATUS; APPLICATIONS OF SCANNING-PROBE TECHNIQUES, e.g. SCANNING PROBE MICROSCOPY [SPM]
60Particular types of SPM [Scanning Probe Microscopy] or microscopes; Essential components thereof
24AFM [Atomic Force Microscopy] or apparatus therefor, e.g. AFM probes
38Probes, their manufacture, or their related instrumentation, e.g. holders
Applicants THE UNIVERSITY COURT OF THE UNIVERSITY OF ST ANDREWS
Priority Data 0702965.5 15.02.2007 GB
0709880.9 23.05.2007 GB
Title
(EN) FLOW VELOCITY AND PRESSURE MEASUREMENT USING A VIBRATING CANTILEVER DEVICE
(FR) MESURE DE PRESSION ET DE VITESSE D'ECOULEMENT EN UTILISANT UN DISPOSITIF VIBRANT EN PORTE-A-FAUX
Abstract
(EN)


Measurement apparatus having a cantilever and a fluid flow channel, the
cantilever being positioned in the channel
so that it projects in a direction parallel to the direction of fluid flow. In
an associated method, the cantilever is positioned in a
flu-id flow channel such that the cantilever extends parallel with the
direction of fluid flow in the channel. Fluid is caused to flow in
the channel at a known velocity. The resonant frequency of the cantilever is
measured at one or more velocities of fluid flow and
calculating the spring constant of the cantilever using the measured resonant
frequency or frequencies. If the spring constant of the
cantilever is known, the measurement of resonant frequency of the cantilever
is used to determine the velocity of the fluid flow.