G - Physics – 01 – P
Patent
G - Physics
01
P
73/74
G01P 5/12 (2006.01) G01P 5/10 (2006.01) G01P 13/02 (2006.01)
Patent
CA 1057528
A B S T R A C T A directional hot film anemometer transducer for sensing the speed and direction of a fluid velocity vector that describes the motion of the fluid in which the transducer is immersed. The trans- ducer is constructed of two cylindrical resistive electrical conductors which are mounted on either side of a third cylindrical member that is used for mechanical support and which also may be used as a blas- ing heated resistive electrical conductor so as to improve this spatial directional response of the three element transducer. The three cylin- drical elements are supported so as to maintain their axes within a single plane and are joined by bridging means which provides a de- gree of thermal isolation between the conductors in order to facilitate the determination of instantaneous fluid flow direction. The bridg- ing means is primarily intended to close the aerodynamic path between the conductors so that the transducer array functions as a single con- stant temperature element when the array is excited by an appropriate constant temperature anemometer electronic control system electri- cally coupled to each conductor of the tranducer array. The electri- cal conductors can be metallic or resistive films which are deposited ed on a cylindrical supporting body. Each conductor which is actively used within the transducer array is made of a material which exhibits a change in its electrical resistivity as a function of temperature. Electrical connections are provided on each end of each conductor to permit each conductor to be separately heated by its own electrical current. The conductors in the transducer array may be fabricated in the form of a cantilever or single ended device.
273803
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