Measuring cell for use with a sensor for measuring the mixture ratio of liquids
First Claim
1. A cell for measuring a mixture ratio of a liquid, comprising:
- a first elongated member;
a second elongated member coupled opposite of, and adjacent to, the first elongated member, the first and second elongated members defining a passage therebetween, the passage having an inlet for receiving the liquid and an outlet for releasing the liquid;
a first electrode coupled to the first elongated member adjacent to the passage;
a second electrode coupled to the second elongated member adjacent to the passage; and
at least one connection layer arranged between the first elongated member and the second elongated member for coupling the first and second elongated members, the connection layer and the first and second elongated members defining the passage, the connection layer being composed of glass and being structured using a thick-film technique,wherein at least one of the first and second electrodes is applied to a corresponding at least one of the first and second elongated members using the thick-film technique.
1 Assignment
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Accused Products
Abstract
A sensor for measuring the mixture ratio of liquids, particularly of fuel mixtures, comprises a measuring cell, which has a cavity with one inlet and one outlet. The liquid is directed through the cavity, whereby regions of the inner wall of the cavity are electrically conductive and, together with at least one additional electrically conductive surface, form a capacitor, which is a component of an evaluation circuit. The measuring cell is manufactured from at least two ceramic carriers, which are connected by way of at least one connection layer to form a layer arrangement. The cavity is produced between the ceramic carriers as the result of the lack of at least one connection layer in certain regions. In each case, at least one electrode is applied, in the vicinity of the cavity, to the ceramic carrier delimiting the cavity using thick-film technology.
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Citations
23 Claims
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1. A cell for measuring a mixture ratio of a liquid, comprising:
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a first elongated member; a second elongated member coupled opposite of, and adjacent to, the first elongated member, the first and second elongated members defining a passage therebetween, the passage having an inlet for receiving the liquid and an outlet for releasing the liquid; a first electrode coupled to the first elongated member adjacent to the passage; a second electrode coupled to the second elongated member adjacent to the passage; and at least one connection layer arranged between the first elongated member and the second elongated member for coupling the first and second elongated members, the connection layer and the first and second elongated members defining the passage, the connection layer being composed of glass and being structured using a thick-film technique, wherein at least one of the first and second electrodes is applied to a corresponding at least one of the first and second elongated members using the thick-film technique. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A cell for measuring a mixture ratio of a liquid comprising:
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a) a first carrier; b) a second carrier physically coupled to the first carrier thereby defining a cavity for containing the liquid, an inlet for receiving the liquid, and an outlet for releasing the liquid; c) a first electrode formed on the first carrier on an inside surface of the cavity such that it can be in direct contact with liquid contained in the cavity; and d) a second electrode formed on the second carrier on an inside surface of the cavity such that it can be in direct contact with the liquid contained in the cavity. - View Dependent Claims (15, 16, 17, 18)
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19. A sensor cell for measuring a mixture ratio of a liquid, comprising:
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(a) a first elongated member; (b) a second elongated member coupled opposite of, and adjacent to, the first elongated member, the first and second elongated members defining a passage therebetween, the passage having an inlet for receiving the liquid and an outlet for releasing the liquid; (c) a first electrode coupled to the first elongated member adjacent to the passage; (d) a second electrode coupled to the second elongated member adjacent to the passage; (e) a third electrode in a cavity, the cavity being adjacent to the second elongated member; (f) a fourth electrode in the cavity; (g) a reference medium contained in the cavity; and (h) an evaluation circuit, the evaluation circuit being electrically coupled with the first electrode, the second electrode, the third electrode, and the fourth electrode, wherein at least one of the first and second electrodes is applied to a corresponding at least one of the first and second elongated members using a thick-film technique, wherein the first and second electrodes form a measuring capacitor, wherein the third electrode and the fourth electrode form a reference capacitor, wherein the reference medium serves as a dielectric for the reference capacitor, and wherein the evaluation circuit uses the reference capacitor to compensate a signal of the measuring capacitor. - View Dependent Claims (20, 21, 22, 23)
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Specification