Patent EP0286419A2 successfully refreshed from Google Patents.
EP0286419A2
Expired / Lapsed
EP
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Method and apparatus for analysing liquid properties
Assignee: Individual
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Filing: 1988-04-08
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Granted: —
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Expires: 2008-04-08
Abstract
Abstract An apparatus for measuring a property of a liquid comprises at least one guide (10) for electromagnetic radiation, means (20) for directing electromagnetic radiation into the guide, means (16) for providing at least one drop of liquid (15) in contact with the guide at a position where radiation from the guide can enter the drop, and means (22) for deriving a signal which is a function of the interaction of the radiation with the liquid of the drop.
Inventors
- 👤 Norman Mcmillan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 20:59
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/0241; G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/255; G01N11/00; G01N11/02; G01N13/00; G01N13/02; G01N2013/0241; G01N21/01; G01N21/03; G01N2021/0346; G01N2021/035; G01N2021/1738; G01N2021/174; G01N21/84; G01N21/85; G01N2021/8557; G01N2021/8564; G01N35/00; G01N35/10; G01N2035/1027; G01N2035/1034; G01N2035/1046; G01N21/1702; G01N21/41; G01N21/43; G01N21/431; G01N2201/00; G01N2201/08
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
79 words
An apparatus for measuring a property of a liquid, characterised by at least one guide (10) for electromagnetic radiation, means (20) for directing electromagnetic radiation into the guide, means (16) for providing at least one drop of liquid (15) in contact with the guide at a position where radiation from the guide can enter the drop, and means (22) for deriving a signal which is a function of the interaction of the radiation with the liquid of the drop.
Claim 2
Independent Claim
79 words
An apparatus for measuring a property of a liquid, characterised by at least one guide (10) for electromagnetic radiation, means (20) for directing electromagnetic radiation into the guide, means (16) for providing at least one drop of liquid (15) in contact with the guide at a position where radiation from the guide can enter the drop, and means (22) for deriving a signal which is a function of the interaction of the radiation with the liquid of the drop.
Claim 3
Dependent Claim
38 words
An apparatus according to Claim 1, wherein the radiation guide (10) has a downwardly facing free end (12), and the liquid drop (15) is provided at the free end of the guide to receive radiation from the guide.
Claim 4
Dependent Claim
24 words
An apparatus according to Claim 2, wherein the means for deriving the said signal comprises an opto-acoustical detector (51) coupled to the radiation guide.
Claim 5
Dependent Claim
63 words
An apparatus according to Claim 2, further including a second radiation guide (11) having a downwardly facing free end (13) close to the free end (12) of the first guide (10), and wherein the liquid drop is provided at the free ends of both of the guides whereby radiation from the first guide enters the second guide by internal reflection inside the drop.
Claim 6
Dependent Claim
30 words
An apparatus according to Claim 4, wherein the means for deriving the said signal comprises means (22) for detecting the amplitude of the radiation reflected into the second radiation guide.
Claim 7
Dependent Claim
36 words
An apparatus according to Claim 4 or 5, wherein at their free ends the axes of the first and second light guides are disposed at angle of between 18° and 22° with respect to one another.
Claim 8
Dependent Claim
54 words
An apparatus according to Claim 4, 5 or 6, further including a respective electrode (42, 43) adjacent the free end of each guide, and a respective conductor (44, 45) extending from each electrode along the exterior of each guide away from the free end for connection of the electrodes to an external electrical circuit.
Claim 9
Independent Claim
36 words
An apparatus according to any one of Claims 2 to 7, further including a pair of capacitor plates (40, 41) disposed respectively one above and one below the free end of at least one radiation guide.
Claim 10
Independent Claim
22 words
An apparatus according to any preceding Claim, wherein the means for directing electromagnetic radiation into the guide comprises a light emitting diode.
Claim 11
Independent Claim
24 words
An apparatus according to any one of Claims 1 to 8, wherein the means for directing electromagnetic radiation into the guide comprises a laser.
Claim 12
Independent Claim
16 words
An apparatus according to any preceding Claim, wherein the radiation is modulated before entering the drop.
Claim 13
Independent Claim
21 words
An apparatus according to any preceding Claim, wherein the radiation is infra-red or visible light in the range 0.3um to 1.3um
Claim 14
Independent Claim
41 words
An apparatus according to any preceding Claim, wherein the means for providing at least one drop of liquid in contact with the said at least one radiation guide comprises means for providing a succession of drops which drip from the guide.
Claim 15
Dependent Claim
20 words
An apparatus according to Claim 13, wherein the means for providing a succession of drops comprises a constant head apparatus.
Claim 16
Independent Claim
39 words
An apparatus according to any preceding Claim, wherein the means for providing at least one drop of liquid in contact with the said at least one radiation guide comprises means for providing a single static drop on the guide.
Claim 17
Independent Claim
18 words
An apparatus according to any preceding Claim, wherein the at least one radiation guide is an optical fibre.
Claim 18
Independent Claim
68 words
A method of measuring a property of a liquid, comprising providing at least one guide for electromagnetic radiation, directing electromagnetic radiation into the guide, providing at least one drop of liquid in contact with the guide at a position where radiation from the guide can enter the drop, and deriving a signal which is a function of the interaction of the radiation with the liquid of the drop.
Claim 19
Independent Claim
68 words
A method of measuring a property of a liquid, comprising providing at least one guide for electromagnetic radiation, directing electromagnetic radiation into the guide, providing at least one drop of liquid in contact with the guide at a position where radiation from the guide can enter the drop, and deriving a signal which is a function of the interaction of the radiation with the liquid of the drop.
References Cited (Backward Citations)
No citation records indexed.
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