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Abstract

A directional heat loss anemometer transducer for sensing both the speed and direction of motion of a fluid, liquid or gas in which the transducer is immersed. The transducer is constructed of fine long cylindrical resistive conductors which are axially disposed about a central, cylindrical supporting body, wherein at least two conductors serve as a direction sensing pair which can also be used to determine impinging fluid speed. The sensing conductor pair are joined together by an adhesive connecting means thereby preventing independent flow between the individual conductors of the conductor pair. The electrical conductors can be metallic or resistive films which are deposited on a cylindrical supporting body, or they may be individual wires of circular cross section. Each conductor is made of a material which exhibits a change in its electrical resistance as a function of temperature. Electrical connections are provided at each end of each conductor to permit each conductor to be separately excited by an electrical current. Typically, the transducer is operated in air so as to provide a non-moving parts means for measuring a particular component of wind speed, and a pair of orthogonally mounted similar transducers can be used to determine sine and cosine components of wind speed. Electrical representation of both speed and direction is obtained by the use of a differential amplifier which is connected between the joined conductor pair mid-point and the mid-point of a reference pair of resistors thereby forming a four arm resistance bridge.

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