| 摘要 |
[Problem] To make it possible to measure the flow speed of a fluid with high precision by completely or almost completely eliminating the effects of noise received by a wiring cable with a hot wire connected to the tip thereof, even if the probe as a whole is made extremely thin. [Solution] A hot-wire flow meter in which one of two resistances at the same pole of a resistance bridge contains a wiring cable with a hot wire connected to the tip thereof, said hot wire is placed in a fluid so as to intersect the direction of the flow thereof, the hot wire is energized and thereby made to generate heat, and by measuring a change in resistance due to cooling of the hot wire proportional to the flow speed of the fluid, said flow speed is measured. Said hot-wire flow meter is characterized in that the other of the abovementioned two resistances at the same pole of the resistance bridge contains a wiring cable, the tip of which forms a closed path, that extends, alongside the wiring cable with the hot wire connected to the tip thereof, almost to said hot wire. |
