Flow velocity measurement method and apparatus, including...

Details Flow velocity measurement method and apparatus, including... Flow velocity measurement method and apparatus, including...

2006-05-02

2006-05-02

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Volume or rate of flow

Thermal type

Reexamination Certificate

active

07036367

ABSTRACT:
A method and apparatus for measuring the flow velocity of a flowing fluid includes a positive temperature coefficient thermistor to be immersing within the flowing fluid in order to provide a measurement of the rate of heat dissipation of the thermistor produced by the flowing fluid, and thereby a measurement the flow velocity of the fluid. The positive temperature coefficient thermistor used has a resistance which increases sharply at the predetermined temperature at which electrical current is maintained in the thermistor such that the thermistor is self-controlled to maintain substantially the predetermined temperature, whereby the electrical current drawn by the thermistor is a measurement of the thermal load on the thermistor resulting from the thermal heat dissipation therefrom by the flowing fluid, and thereby a measurement of the flow velocity of the fluid. Various embodiments of the invention are described, including those for measuring heat flow in a centralized heating or air conditioning system, wind velocity and direction, and flow velocity in a wind tunnel.

REFERENCES:
patent: 5069066 (1991-12-01), Djorup
patent: 5112136 (1992-05-01), Sakuma et al.
patent: 5335513 (1994-08-01), Campbell et al.
patent: 6509553 (2003-01-01), Golan et al.

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