Ambient sensing devices
First Claim
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1. A device for the measurement of a chemical or an ionic species comprising:
- an amorphous oxide of a metal of the platinum or rhenium groups of metals, anda layer of material sensitive to said chemical or ionic species distinct from said amorphous metal oxide formed on said amorphous metal oxide and in electrical contact therewith, said sensitive layer developing an electrical potential upon contact with said chemical or ionic species and said metal oxide transmitting an electrical signal that is a function of said electrical potential.
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Abstract
A device for the measurement of ionic and gas species at high temperatures. Platinum metal oxides are used for the electrical signal paths between electrical elements on the device to make the device particularly adaptable to high temperature measurement applications. Chemically sensitive composite structures may be hardened for high temperature applications by mixing polyimide with the materials normally used in the outer layer of such structure.
69 Citations
22 Claims
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1. A device for the measurement of a chemical or an ionic species comprising:
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an amorphous oxide of a metal of the platinum or rhenium groups of metals, and a layer of material sensitive to said chemical or ionic species distinct from said amorphous metal oxide formed on said amorphous metal oxide and in electrical contact therewith, said sensitive layer developing an electrical potential upon contact with said chemical or ionic species and said metal oxide transmitting an electrical signal that is a function of said electrical potential. - View Dependent Claims (2, 3, 4)
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5. A device for the measurement of a chemical or ionic species comprising:
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a chemically sensitive layer that develops an electrical potential representative of the concentration of said species, and one or more continuous semi-permeable layers overlaying said sensitive layer and separating it from an environment in which the device is located but permeable to the chemical or ionic species to be measured, wherein the outermost layer contains polyimide.
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6. A device for the measurement of activity of a gas species comprising:
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a chemically sensitive layer which develops an electrical potential representative of the concentration of said gas when the device is exposed to said gas; means in electrical contact with said chemical sensitive layer for transmitting a signal that is a function of said electrical potential; a gas conducting aqueous epoxy medium in electrochemical contact with said chemical sensitive layer, and a heterogeneous membrane containing polyimide, said membrane separating said epoxy medium from said gas species and being permeable to said gas species. - View Dependent Claims (7, 8, 9, 10)
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11. A device for the measurement of a gas species comprising:
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a chemically sensitive layer that develops an electrical potential representative of the concentration of said gas, and one or more continuous semi-permeable layers overlaying said sensitive layer and separating it from an environment in which the device is located, wherein the outermost layer is a mixture of polyimide and either polytetrafluoroethylene or zeolite.
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12. A device for the measurement of activity of an ionic species comprising:
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a ceramic container filled with an electrolyte medium and containing a reference electrode; a chemically sensitive layer mounted on an exterior surface of said container; electronic circuitry connected to said layer and mounted on said surface of said container wherein said chemically sensitive layer and said electronic circuitry are made with materials which are stable at high temperatures; signal paths interconnecting said chemically sensitive layer and said electronic circuitry; a hermetic seal encompassing said electronic circuitry; and one or more continuous semi-permeable layers overlaying said sensitive layer and separating it from an environment in which the device is located but permeable to the chemical or ionic species to be measured, wherein the outermost layer contains polyimide. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A device for the measurement of a chemical or an ionic species comprising:
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an amorphous oxide of a metal of the platinum or rhenium groups of metals, a layer of material sensitive to said chemical or ionic species formed on said amorphous metal oxide and in electrical contact therewith, said sensitive layer developing an electrical potential upon contact with said chemical or ionic species and said metal oxide transmitting an electrical signal that is a function of said electrical potential, and one or more continuous semi-permeable layers overlaying said sensitive layer and separating it from an environment in which the device is located but permeable to the chemical or ionic species to be measured, wherein the outermost layer contains polyimide. - View Dependent Claims (20, 21, 22)
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Specification