Measuring and testing – Volume or rate of flow – Thermal type
Patent
1976-06-11
1977-05-24
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
73189, 338308, 338320, G01F 168
Patent
active
040247619
ABSTRACT:
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 transducer 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 biasing heated resistive electrical conductor so as to improve the spatial directional response of the three element transducer. The three cylindrical elements are supported so as to maintain their axes within a single plane and are joined by bridging means which provides a degree of thermal isolation between the conductors in order to facilitate the determination of instantaneous fluid flow direction. The bridging means is primarily intended to close the aerodynamic path between the conductors so that the transducer array functions as a single constant temperature element when the array is excited by an appropriate constant temperature anemometer electronic control system electrically coupled to each conductor of the transducer array. The electrical conductors can be metallic or resistive films which are deposited 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.
REFERENCES:
patent: 3592055 (1971-07-01), Dorman
patent: 3677085 (1972-07-01), Hayakawa
patent: 3900819 (1976-08-01), Djorup
Goldstein Herbert
Kyma Corporation
Mentag Robert G.
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