초록 ▼

An improved bridge-type hot-wire constant overheat anemometer having current controlled temperature compensation circuitry, whereby matched sensors may be employed. Independent voltage sensing and current supply paths along with high impedance cross-coupled velocity sensing circuitry assures device

An improved bridge-type hot-wire constant overheat anemometer having current controlled temperature compensation circuitry, whereby matched sensors may be employed. Independent voltage sensing and current supply paths along with high impedance cross-coupled velocity sensing circuitry assures device accuracy.

대표청구항 ▼

An anemometer circuit for sensing a parameter of a flowing medium, comprising in combination: first and second temperature sensitive resistive elements exposed to a flowing medium, said first resistive element mounted to sense a parameter of said flowing medium and said second resistive element moun

An anemometer circuit for sensing a parameter of a flowing medium, comprising in combination: first and second temperature sensitive resistive elements exposed to a flowing medium, said first resistive element mounted to sense a parameter of said flowing medium and said second resistive element mounted to sense the temperature of said medium; first comparator means coupled to said first and second resistive elements for comparing first and second signals corresponding to the condition of said respective first and second resistive elements; means coupled to said comparator means for supplying current to said second resistive element in relation to the temperature of said medium so as to cause said condition of said second resistive element to follow the temperature of said fluid in a predetermined relation thereto; second comparator means coupled to said first and second resistive elements for detecting a change in a condition of one or the other of the resistive elements, said second comparator means includes first and second inputs, said first and second resistive elements being each coupled in parallel across said first and second inputs for sensing a relative change therebetween; and means coupled to said second comparator means for variably supplying power to said first resistive element to maintain a balanced relation to said second resistive element at said first and second comparator means whereby the power delivered to said first resistive element is determinative of the parameter of interest.