Process of making a solid state microanemometer
First Claim
1. A method of forming a microanemometer comprising the step of:
- selectively processing selected parts of a single semiconductor crystal to form a fluid flow sensing bridge with at least one semiconductor resistor, each semiconductor resistor in the sensing bridge being thermally and electrically isolated from every other semiconductor resistor in the sensing bridge.
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Abstract
A solid state microanemometer is micromachined from a crystal to a shape with four thick external sides that define an outer rectangle, four thin sections that define an inner rectangle and four diagonally directed branches interconnecting the corners of the outer rectangle to the inner rectangle. Four semiconductor resistors located on the four inner sections form a sensing bridge. Each external side has a pair of electrical contacts that are electrically interconnected, via conductive leads that extend along the diagonal branches and partially along the inner sections, to one of the semiconductor resistors. The physically connected semiconductor resistors and external sides form a rugged solid state device, while thermal and electrical isolation of the resistors from each other permits higher operating temperatures and improved fluid flow sensing capability.
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Citations
12 Claims
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1. A method of forming a microanemometer comprising the step of:
selectively processing selected parts of a single semiconductor crystal to form a fluid flow sensing bridge with at least one semiconductor resistor, each semiconductor resistor in the sensing bridge being thermally and electrically isolated from every other semiconductor resistor in the sensing bridge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
Specification