| 摘要 |
<p>PURPOSE:To enable to perform a high-precise and easy measurement of flow, by a method wherein a positive characteristic thermister and a heat-sensitive object are mounted in a flow path for a fluid to be measured, and the flow of the fluid to be measured is determined from the power consumption of the thermister and the heat- sensitive signal of the heat-sensitive object. CONSTITUTION:A positive characteristic thermister 2 and a heat-sensitive object 1 are mounted at the inside of a pipe 1. When the positive characteristic thermister 2 is thermally balanced, an quation of V1I1=D(T-Ta) approximately holds, where V1 is an applied voltage applied between electrodes 2b-2c, I1 is a current, T is a heating temperature, and Ta is a temperature of a spherical medium wherein the positive characteristic 2 is placed. The left side indicates the input energy of the thermister 2, and the right side shows the heat dispersion amount thereof. D is a dispersion factor. Provided the applied voltage V1 in the aforesaid equation is constant, the current I1 increases and decreases in proportion to a velocity of flow, and thereby the detection of the current I1 finds an amount of flow. The heat-sensitive object 3 detects the temperature Ta of the spherical medium, and the detecting signal makes a temperature correction of the current I1 of the thermister 2 converted into a flow detecting signal.</p> |
