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1. (WO1991005999) APPARATUS FOR ASSESSING A PARTICULAR PROPERTY IN A MEDIUM
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/005999 International Application No.: PCT/GB1990/001615
Publication Date: 02.05.1991 International Filing Date: 19.10.1990
Chapter 2 Demand Filed: 10.04.1991
IPC:
G01K 5/52 (2006.01) ,G01N 25/48 (2006.01) ,G01N 29/036 (2006.01) ,G02B 26/00 (2006.01)
G PHYSICS
01
MEASURING; TESTING
K
MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
5
Measuring temperature based on the expansion or contraction of a material
48
the material being a solid
50
arranged for free expansion or contraction
52
with electrical conversion means for final indication
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
25
Investigating or analysing materials by the use of thermal means
20
by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
48
on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
29
Investigating 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
02
Analysing fluids
036
by measuring frequency or resonance of acoustic waves
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
26
Optical devices or arrangements using movable or deformable optical elements for controlling the intensity, colour, phase, polarisation or direction of light, e.g. switching, gating, modulating
Applicants:
UNIVERSITY OF STRATHCLYDE [GB/GB]; McCance Building 16 Richmond Street Glasgow G1 1BA, GB (AllExceptUS)
CULSHAW, Brian [GB/GB]; GB (UsOnly)
TURNER, Anthony, Peter, Francis [GB/GB]; GB (UsOnly)
Inventors:
CULSHAW, Brian; GB
TURNER, Anthony, Peter, Francis; GB
Agent:
MacDOUGALL, Donald, Carmichael ; Cruikshank & Fairweather 19 Royal Exchange Square Glasgow G1 3AE, GB
Priority Data:
8923699.620.10.1989GB
Title (EN) APPARATUS FOR ASSESSING A PARTICULAR PROPERTY IN A MEDIUM
(FR) APPAREIL SERVANT A EVALUER UNE CARACTERISTIQUE PARTICULIERE D'UN MILIEU
Abstract:
(EN) For assessing a particular property of a medium (13) a sensor (18) is provided which is sensitive to the property and which is thermally activated when in contact with the property containing medium. The sensor (18) is externally mounted on the undersurface of a silicon wafer (9) the uppersurface of which contains a well in which a vibratile bridge element (16) is located. The top of the well is closed off so that the element (16) is within a closed chamber (15). Excitation energy (12) from a source (14) is delivered to the element (16) to establish vibratory motion which is monitored and detected by a circuit (19). Presence of the property in the medium (13) causes a thermal change in the wafer (9) resulting in a change in the resonance frequency of the vibratory motion of element (16). The frequency shift is a measure of the property.
(FR) Afin d'évaluer une caractéristique particulière d'un milieu (13), on prévoit un détecteur (18) qui est sensible à ladite caractéristique et qui peut être activé thermiquement lorsqu'il se trouve en contact avec ledit milieu. Le détecteur (18) est monté sur la surface inférieure d'une tranche de silicium (9) dont la surface supérieure comporte un puits dans lequel se situe un élément en pont vibratoire (16). Le haut du puits est fermé de sorte que l'élément (16) se trouve dans une chambre fermée (15). De l'énergie d'excitation (12) provenant d'une source (14) alimente l'élément (16) afin de créer un mouvement vibratoire qui est contrôlé et détecté par un circuit (19). La présence de la caractéristique dans le milieu (13) provoque un changement thermique dans la tranche (9), ce qui a l'effet de modifier la fréquence de résonance du mouvement vibratoire de l'élément (16). Le changement de fréquence représente la caractéristique.
Designated States: JP, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0496812US5296374JPH05505455