Flow sensor on insulator
First Claim
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1. A flow sensor comprising:
- a thermally insulating substrate;
a temperature sensing element disposed on said substrate; and
a thin film heating element disposed on said temperature sensing element and being in close thermal contact with and electrically isolated from said temperature sensing element;
wherein said temperature sensing element includes a pn junction having a p-doped region and a n-doped region positioned laterally on said substrate and a junction between the p-doped and the n-doped regions; and
wherein said heating element is positioned over said junction.
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Abstract
A flow sensor on a thermally insulating substrate is provided with improved thermal conductance and ruggedness to hostile environments. The flow sensor includes a pn junction temperature sensing element on the substrate, a layer of dielectric material, which provides electric isolation and physical protection, covering the pn junction element, and a thin film heating element covering the dielectric layer and being in close thermal contact with the pn junction element.
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Citations
23 Claims
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1. A flow sensor comprising:
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a thermally insulating substrate; a temperature sensing element disposed on said substrate; and a thin film heating element disposed on said temperature sensing element and being in close thermal contact with and electrically isolated from said temperature sensing element; wherein said temperature sensing element includes a pn junction having a p-doped region and a n-doped region positioned laterally on said substrate and a junction between the p-doped and the n-doped regions; and wherein said heating element is positioned over said junction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A flow sensor comprising:
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a thermally insulating substrate; a plurality of temperature sensing elements disposed on said substrate and being spaced apart from one another; and a thin film heating element disposed on said temperature sensing elements and being in close thermal contact with and electrically isolated from each of said temperature sensing elements; wherein each of said temperature sensing elements includes a pn junction having a p-doped region and a n-doped region positioned laterally on the substrate and a junction between said p-doped and said n-doped regions; and wherein said heating element is positioned over said junction. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A flow sensor comprising:
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a thermally insulating substrate; an upstream sensor disposed on said substrate;
wherein said upstream sensor comprises a plurality of upstream temperature sensing elements spaced apart from one another; andan upstream thin film heating element disposed on said upstream temperature sensing elements and being in close thermal contact with an electrically isolated from each of said upstream temperature sensing elements; and a downstream sensor disposed on said substrate and spaced apart from said upstream sensor;
wherein said downstream sensor comprises a plurality of downstream temperature sensing elements spaced apart from one another; anda downstream thin film heating element disposed on said downstream temperature sensing elements and being in close thermal contact with and electrically isolated from each of said downstream sensing elements; wherein each of said upstream and said downstream sensing elements includes a pn junction having a p-doped region and a n-doped region positioned laterally on said substrate and a junction between said p-doped and said n-doped regions; and wherein each of said heating elements is positioned over its respective temperature sensing elements. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification