H - Electricity – 01 – L
Patent
H - Electricity
01
L
73/74
H01L 23/08 (2006.01) G01P 5/12 (2006.01)
Patent
CA 1120286
ABSTRACT DIRECTIONAL HEAT LOSS ANENOMETER TRANSDUCER A directional heat loss anenometer 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 dis- posed 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 prevent- ing independent flow between the individual conductors of the conduct- or 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 oper- ated 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 co- sine 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. Direction sense is implicit in the sign of the differential amplifier output signal while speed is implicit in the mag- nitude of the differential amplifier output signal. The axis crossing, the point where direction sign changes polarity and the region where impinging flow is parallel to the long dimension of the conductor pair, is exceptionally smooth without discontinuities or irregularities.
352271
Borden Ladner Gervais Llp
Djorup Robert S.
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