Method and device for measuring a fluid flow velocity

摘要

The method involves warming a heating resistor (14) during the duration of a filament current pulse. The current flowing in an integrator (20) for a predetermined time period is detected by a sensing resistor (16), where the current flowing in another integrator (22) during a predetermined time period is detected by a reference resistor (34). An average sensing resistor value and an average reference resistor value are determined and amplified. A difference signal of the average sensing resistor value and average reference resistor value is formed in an instrumentation amplifier (24). An independent claim is included for a measuring device for measuring the flow rate of fluids, particularly for implementing the flow rate measuring method, with a measurement circuit.