| 摘要 |
A concentration detector is disclosed, which is adapted to detect a concentration of a liquid fuel in a container. The concentration detector includes a rotating means positioned underneath a level of a liquid fuel and rotatable at an angle theta on a X-Y plane. The rotating means includes at least three floating objects connected with each other. Each floating object has a specific gravity less than a specific gravity of the liquid fuel rho. The floating objects are balanced according to a torque equation, F(theta,rho)=0, such that the rotating means is still under the level of the liquid fuel. While a concentration of the liquid fuel is changed and the angle theta of the rotating means is detected, the specific gravity of the liquid fuel rho is obtained from the torque equation, F(theta,rho)=0, and thereby computing the concentration of the liquid fuel.
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