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1. WO2010026504 - METHOD FOR INSTANTANEOUSLY AND CONTINUOUSLY MEASURING AIRBORNE PARTICLES OR POLLENS, AND RELATED DEVICE

Publication Number WO/2010/026504
Publication Date 11.03.2010
International Application No. PCT/IB2009/053684
International Filing Date 21.08.2009
IPC
G01N 29/02 2006.1
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
G01N 29/036 2006.1
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
G01G 3/13 2006.1
GPHYSICS
01MEASURING; TESTING
GWEIGHING
3Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
12wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
13having piezo-electric or piezo-resistive properties
G01N 5/02 2006.1
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
02by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
G01N 15/02 2006.1
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
15Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
02Investigating particle size or size distribution
CPC
G01N 2015/0261
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
15Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
02Investigating particle size or size distribution
0255with mechanical, e.g. inertial, classification, and investigation of sorted collections
0261using impactors
G01N 2291/014
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
2291Indexing codes associated with group G01N29/00
01Indexing codes associated with the measuring variable
014Resonance or resonant frequency
G01N 2291/02408
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
2291Indexing codes associated with group G01N29/00
02Indexing codes associated with the analysed material
024Mixtures
02408Solids in gases, e.g. particle suspensions
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
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
Applicants
  • AUBERT, Bruno [FR]/[FR]
Inventors
  • AUBERT, Bruno
Priority Data
08 0483400002.09.2008FR
Publication Language French (fr)
Filing Language French (FR)
Designated States
Title
(EN) METHOD FOR INSTANTANEOUSLY AND CONTINUOUSLY MEASURING AIRBORNE PARTICLES OR POLLENS, AND RELATED DEVICE
(FR) Procédé de mesure instantanée et continue de particules ou de pollens dans l'air et dispositif associé
Abstract
(EN) The method involves causing the flow of air, the particle or pollen content of which is desired to be measured, over a piezoelectric element set into resonance in a longitudinal or transverse mode, thus inducing an impact with said particles and thus capable of measuring the variation in frequency, impedance, or current of the signal, induced by the kinetic energy of said impact. Preferably, the air is caused to flow between two piezoelectric elements placed sufficiently close together such that the impact of a piezoelectric element on the particles leads to the discharge of the particles to the second piezoelectric element, doing likewise and so forth, such that there is thus an increased number of impacts making it possible to amplify the kinetic energy absorbed by the piezoelectric elements, thus enabling an amplification of the variation in frequency, impedance, or current of the produced signal. A first use is a customized warning device wearable on the wrist or belt to warn people with delicate physical conditions of the presence of a peak in particle or pollen levels.
(FR) Le procédé consiste à faire circuler l'air dont on veut mesurer la teneur en particules ou en pollens, sur un élément piézoélectrique mis en résonnance dans un mode longitudinal ou transversal qui induise donc un impact avec les dites particules et ainsi pouvoir mesurer la variation en fréquence, en impédance ou en courant du signal, induite par l'énergie cinétique du dit impact. Préférentiellement, on fait circuler l'air entre deux éléments piézoélectriques suffïsement rapprochés afin que l'impact d'un élément piézoélectrique sur les particules conduisent à projeter les particules vers le deuxième élément piézoélectrique qui fait de même et ainsi de suite pour qu'il y ait ainsi un nombre accru d'impacts qui permettront d'amplifier l'énergie cinétique absorbée par les éléments piézoélectriques permettant ainsi une amplification de la variation en fréquence, en impédance ou en courant du signal produit. Une première application est un dispositif d'alerte individualisée portable au poignet ou à la ceinture, pour alerter les personnes fragiles de la présence d'un pic de particules ou de pollens.
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