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1. EP0943091 - METHOD AND APPARATUS FOR CHARACTERIZING MATERIALS BY USING A MECHANICAL RESONATOR

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Office
European Patent Office
Application Number 98949736
Application Date 02.10.1998
Publication Number 0943091
Publication Date 22.09.1999
Publication Kind B2
IPC
G01N 29/02
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
29Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
02Analysing fluids
G01H 13/00
GPHYSICS
01MEASURING; TESTING
HMEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
13Measuring resonant frequency
G01N 5/04
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
5Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
04by removing a component, e.g. by evaporation, and weighing the remainder
G01N 9/00
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
9Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
G01N 29/036
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
29Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
02Analysing fluids
036by measuring frequency or resonance of acoustic waves
G01N 29/34
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
29Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
34Generating the ultrasonic, sonic or infrasonic waves
CPC
B01J 2219/00704
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
2219Chemical, physical or physico-chemical processes in general; Their relevant apparatus
00274Sequential or parallel reactions; Apparatus and devices for combinatorial chemistry or for making arrays; Chemical library technology
0068Means for controlling the apparatus of the process
00702Processes involving means for analysing and characterising the products
00704integrated with the reactor apparatus
G01H 13/00
GPHYSICS
01MEASURING; TESTING
HMEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
13Measuring resonant frequency
G01N 5/04
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
5Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
04by removing a component, e.g. by evaporation, and weighing the remainder
G01N 9/002
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
9Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
002using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis
G01N 11/16
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
11Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
10by moving a body within the material
16by measuring damping effect upon oscillatory body
G01N 29/022
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
29Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
02Analysing fluids
022Fluid sensors based on microsensors, e.g. quartz crystal-microbalance [QCM], surface acoustic wave [SAW] devices, tuning forks, cantilevers, flexural plate wave [FPW] devices
Applicants MEAS FRANCE
Inventors MATSIEV LEONID
BENNETT JAMES
MCFARLAND ERIC
Designated States
Priority Data 09133171 12.08.1998 US
08946921 08.10.1997 US
9820764 02.10.1998 US
Title
(DE) VERFAHREN UND VORRICHTUNG ZUR CHARAKTERISIERUNG VON MATERIALIEN MITTELS EINES MECHANISCHEN RESONATORS
(EN) METHOD AND APPARATUS FOR CHARACTERIZING MATERIALS BY USING A MECHANICAL RESONATOR
(FR) PROCEDE ET DISPOSITIF DE CARACTERISATION DES MATERIAUX PAR UTILISATION D'UN RESONATEUR MECANIQUE
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Abstract
(EN) A method and apparatus for measuring properties of a liquid composition includes a mechanical resonator, such as a thickness shear mode resonator or a tuning fork resonator, connected to measurement circuit. The measurement circuit provides a variable frequency input signal to the tuning fork, causing the mechanical resonator to oscillate. To test the properties of a liquid composition, the mechanical resonator is placed inside a sample well containing a small amount of the liquid. The input signal is then sent to the mechanical resonator and swept over a selected frequency range, preferably less than 1 MHz to prevent the liquid being tested from exhibiting gel-like characteristics and causing false readings. The mechanical resonator's response over the frequency range depends on various characteristics of the liquid being tested, such as the temperature, viscosity, and other physical properties.
(FR) La présente invention concerne un procédé et un dispositif permettant de mesurer des propriétés d'une composition liquide. Ce dispositif comporte un résonateur mécanique, tel qu'un résonateur à mode découpage en épaisseur ou qu'un résonateur à diapason, connecté à un circuit de mesure. Le circuit de mesure fournit au diapason un signal d'entrée de fréquence variable, ce qui provoque l'oscillation du résonateur mécanique. Pour tester les propriétés mécaniques d'une composition liquide, on place le résonateur mécanique à l'intérieur d'un puits d'échantillon contenant une petite quantité du liquide. On envoie alors le signal d'entrée au résonateur mécanique en balayant une plage de fréquences sélectionnée, de préférence inférieure à 1 MHz de façon à empêcher que le liquide à tester ne présente de caractéristiques de type gel ou d'autres propriétés physiques.
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