| 摘要 |
PURPOSE:To detect a liquid level of any liquid by placing opposingly a photodetecting optical fiber provided with a photodetector, through a window glass of the side wall of a liquid tank, to a light sending optical fiber provided in a floating on a liquid surface. CONSTITUTION:A light sending optical fiber 6 is provided in a floating plate 4 interlocking with a liquid 2 on the liquid surface in a liquid tank 1 and also sliding along the liquid tank 1, and a photodetecting optical fiber 7 having a photodetector 8 is placed so as to be opposed to the fiber 6, through a window glass 3 of the side wall of the liquid tank 1. In this way, a liquid level can be detected without making the fiber 6 contact to the liquid 2. |
