| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a flow-rate measuring apparatus of a simple constitution by which the flow rate of a fluid can be measured with high accuracy without depending on an ambient temperature and the flow rate of the fluid. SOLUTION: The flow-rate measuring apparatus is provided with a processing part 20 wherein the driving voltage of a bridge circuit 1 is controlled so as to balance the bridge circuit 1 which uses a heating resistor RH and a reference resistor RR, as well as a pair of fixed resistors R1 , R2 connected in series to the heating resistor and the reference resistor, on the basis of the driving voltage of the bridge circuit and on the basis of the output voltage of the bridge circuit, the ambient temperature applied to the reference resistor is calculated, and the flow rate found by a sensor mainbody is corrected according to a change rateΔP per unit temperature of the sensor mainbody according to the ambient temperature TQ and the flow rate.</p> |
