Patent EP0023732A1 successfully refreshed from Google Patents.
EP0023732A1
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EP
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Capacitive gauge
Assignee: Individual
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Filing: 1980-07-04
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Granted: —
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Expires: 2000-07-04
Abstract
Abstract Gauge comprising at least one capacitor for connection into a bridge-circuit, said capacitor having at least one of its electrode support plates coated with an electrode overlay (22) such that a system of sub-electrodes (23, 28, 29) is formed, said subelectrodes (23, 28, 29) mutually separated at least by gaps (21, 25) but even if in geometrical respect the gaps are the only separation between sub-electrodes, yet they are connected in the bridge-circuit such that each sub-electrode (28a, b) in the activated state is surrounded by subelectrodes (29a, b) acting as guard-elements. <??>In combination with the other, opposite electrode plate (20), wheter or not subdivided in sub-electrodes, there may be formed a capacitor (C1, C2) of the plate-type or of the cross-type. <??>A capacitor (C1) thus formed can cooperate with a similar capacitor (2) said pair of capacitors offering the possibility to measure any deviation in the parallelity between two surfaces or in the angular coincidence. <??>Accuracies are obtained of 1 : 10<6> or better.
Inventors
- 👤 Willem Christiaan Heerens
- 👤 Gerrit Hendrik Peerbolte
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 11:57
CPC Classifications
G; G01; G01H; G01H11/00; G01H11/06; G01B; G01B7/00; G01B7/02; G01B7/06; G01B7/08; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/24; G01D5/241; G01D5/2417; G01L; G01L1/00; G01L1/14; G01L1/142; G01L9/00; G01L9/0041; G01L9/0072; G01L9/0075; H; H01; H01G; H01G5/00
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
131 words
Capacitive gauge, comprising at least one capacitor to be connected in a bridge circuit, said capacitor having at least one of its electrode supports coated with an electrode overlay such that a system of gap-separated sub-electrodes is formed, of which at least one functions as guard element and at least one functions as capacitor element, if activated, said system being electro-statically shielded, if any, by a sleeve surrounding the electrode supports, characterized in that a sub-electrode (28a) functioning, if activated, as capacitor element, cooperates with at least another similar simultaneously activatable sub-electrode (28b), which sub-electrodes (28a,b) even if they are in a geometrical respect, if any, separated by at least a gap or similar means, yet are surrounded from all sides by sub-electrodes (23, 29; fig. 6) functioning as guard elements.
Claim 2
Dependent Claim
131 words
Capacitive gauge, comprising at least one capacitor to be connected in a bridge circuit, said capacitor having at least one of its electrode supports coated with an electrode overlay such that a system of gap-separated sub-electrodes is formed, of which at least one functions as guard element and at least one functions as capacitor element, if activated, said system being electro-statically shielded, if any, by a sleeve surrounding the electrode supports, characterized in that a sub-electrode (28a) functioning, if activated, as capacitor element, cooperates with at least another similar simultaneously activatable sub-electrode (28b), which sub-electrodes (28a,b) even if they are in a geometrical respect, if any, separated by at least a gap or similar means, yet are surrounded from all sides by sub-electrodes (23, 29; fig. 6) functioning as guard elements.
Claim 3
Dependent Claim
19 words
Capacitive gauge according to claim 1, characterized in that each activatable sub-electrode is surrounded, from all sides, by guard-elements.
Claim 4
Dependent Claim
32 words
Capacitive gauge according to claim 1, characterized.in that activatable sub-electrodes adjoining each other in a geometrical respect wholly or partly only separated by gaps, are connected to earth through separate power sources.
Claim 5
Dependent Claim
50 words
Capacitive gauge according to any of the preceding claims 1-3, characterized in that to obtain - in an electrode support embodiment departing from the rotation-symmetrical shape - simultaneously activatable sub-electrodes separated by sub-electrodes functioning as guard-element, a gap-pattern is provided in the electrode overlay according to slanting or rectangular coordinates.
Claim 6
Dependent Claim
70 words
Capacitive gauge according to any of the preceding claims 1-3, in which the electrode overlay is divided into a plurality of sub-electrodes by a plurality of concentric gaps and at least one radial gap whether or not interrupted, characterized in that in order to obtain simultaneously activatable sub-electrodes separated by sub- electrodes functioning as guard-elements, at least one radial gap whether or not interrupted is provided in the electrode overlay.
Claim 7
Dependent Claim
38 words
Capacitive gauge according to any of claims 1-5, characterized in that a sub-electrode functioning as activatable capacitor element cooperates with another sub-electrode lying one moment in a first coordinate direction, and the next moment in another coordinate direction.
Claim 8
Dependent Claim
29 words
Capacitive gauge according to any of the preceding claims 1-5, characterized in that in any of two different coordinate directions, two separated, activatable sub-electrodes cooperate together as a pair.
Claim 9
Dependent Claim
31 words
Capacitive gauge according to claim 7, characterized in that two interrupted radial gaps are provided in the electrode overlay such that four sub-electrodes are formed being offset over 90 0 .
Claim 10
Dependent Claim
41 words
Capacitive gauge according to any of the preceding claims, characterized in that the second electrode support is likewise divided into sub-electrodes by means of a pattern of intersecting gaps in an analogous manner as has happened with the first electrode support.
Claim 11
Dependent Claim
32 words
Capacitive gauge as claimed in claim 9, characterized in that the gap pattern of the second electrode support exhibits in plan view the mirror image of that of the first electrode support.
Claim 12
Dependent Claim
26 words
Capacitive gauge as claimed in claim 10, characterized in that the second electrode support as regards its sub-electrode configuration is identical to the first electrode support.
Claim 13
Dependent Claim
31 words
Capacitive gauge as claimed in any of claims 9-11, characterized in that a sub-electrode in one electrode support and a sub-electrode in the other electrode support are combined into a cross-capacitor.
Claim 14
Dependent Claim
43 words
Capacitive gauge as claimed in any of claims 9-11, characterized in that both sub-electrodes, contributing to the cross-capacitance . are sub-divided by radial gaps into equal segments, which are connected in pairs to form diametrically orientated cross-capacitances for measurement and/or elimination of rotations.
Claim 15
Dependent Claim
53 words
Capacitive gauge as claimed in any of the preceding claims 1-9, in which the second electrode support is connected to the shielding sleeve, characterized in that for application as a position measuring apparatus the second electrode support is a flexible plate or membrane, being mechanically connected to, but electrically insulated from the sleeve.
Claim 16
Dependent Claim
29 words
Position measuring device as claimed in claim 14, characterized in that the electrode arrangement is provided on both sides of the flexible electrode acting as the plane of symmetry.
Claim 17
Dependent Claim
20 words
Device as claimed in claim 14 or 15, characterized in that the flexible part of the flexible electrode is ringshaped.
Claim 18
Dependent Claim
22 words
Device as claimed in claim 16, characterized in that the flexible electrode in its centre is provided with a rotation symmetrical mass.
Claim 19
Dependent Claim
17 words
Device as claimed in claim 17, characterized in that the gauge is constructed as a weighing apparatus.
Claim 20
Dependent Claim
22 words
Device as claimed in any of the preceding claims, characterized in that each of the participating electrodes are connected with a commutator.
Claim 21
Dependent Claim
25 words
Device as claimed in any of the preceding claims, characterized in that the space between the electrode supports is closed by a non-permeable flexible casing.
Claim 22
Dependent Claim
193 words
Position measuring device built up of a system of capacitances consisting of an assembly of sub-electrodes adjoining each other along gaps, provided - according to appropriate patterns - on at least one of a set of at least two insulating electrode supports being movable and/or adjustable with respect to each other within a sleeve, the system of capacitances being included into one or more measuring bridges having a common neutral point, characterized in that the capacitances elected for the measurement and formed between sub-electrodes (28; 56) on the first electrode support (22; 52) and sub-electrodes ("20"; 58') on one of the other electrode supports (20'; 52'), are of the ideal or substantially ideal plate capacitor type and/or ideal or substantially ideal cross-capacitor type, and that simultaneously any of the remaining sub-electrodes (23, 29; 53, 57, 59) on the first electrode support (22; 52) is sufficiently shielded from any of those sub-electrodes on one of the other electrode supports, which together with the relative sub-electrode on the first electrode support may not constitute capacitances disturbing the measurement, whereas those sub-electrodes, for which this latter requirement cannot be realised, are coupled to the neutral point.
Claim 23
Dependent Claim
193 words
Position measuring device built up of a system of capacitances consisting of an assembly of sub-electrodes adjoining each other along gaps, provided - according to appropriate patterns - on at least one of a set of at least two insulating electrode supports being movable and/or adjustable with respect to each other within a sleeve, the system of capacitances being included into one or more measuring bridges having a common neutral point, characterized in that the capacitances elected for the measurement and formed between sub-electrodes (28; 56) on the first electrode support (22; 52) and sub-electrodes ("20"; 58') on one of the other electrode supports (20'; 52'), are of the ideal or substantially ideal plate capacitor type and/or ideal or substantially ideal cross-capacitor type, and that simultaneously any of the remaining sub-electrodes (23, 29; 53, 57, 59) on the first electrode support (22; 52) is sufficiently shielded from any of those sub-electrodes on one of the other electrode supports, which together with the relative sub-electrode on the first electrode support may not constitute capacitances disturbing the measurement, whereas those sub-electrodes, for which this latter requirement cannot be realised, are coupled to the neutral point.
References Cited (Backward Citations)
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