Anemometer having a graphite fiber hot wire
First Claim
1. A hot-wire anemometer comprising electrical resistance bridge means including a fiber hot wire resistor in one arm thereof that has a temperature-dependent resistance, said fiber hot wire being formed substantially of graphite, means for supplying electrical power to said fiber hot wire to internally heat the same, means for supporting a span of said hot wire in tension for exposure to a stream of flowing cooling gas, and signal converting means coupled to said bridge means for correlating the cooling effect on the hot wire resistance with gas flow velocity.
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Accused Products
Abstract
A hot-wire anemometer includes a graphite fiber hot wire forming one arm of a resistance bridge. Graphite fibers have high tensile strengths, relatively high temperature coefficients of resistance and other thermal and electrical properties which make them particularly suitable for use as anemometer hot wires. The graphite fibers may be doped or intercalated with chemical species that adjust their thermal and electrical properties.
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Citations
14 Claims
- 1. A hot-wire anemometer comprising electrical resistance bridge means including a fiber hot wire resistor in one arm thereof that has a temperature-dependent resistance, said fiber hot wire being formed substantially of graphite, means for supplying electrical power to said fiber hot wire to internally heat the same, means for supporting a span of said hot wire in tension for exposure to a stream of flowing cooling gas, and signal converting means coupled to said bridge means for correlating the cooling effect on the hot wire resistance with gas flow velocity.
Specification