| 摘要 |
PURPOSE:To measure a liquid level of any liquid by placing oppositely an optical fiber sheet which has coupled an image sensor to its output terminal, through a condenser lens and window glass, to a light sending optical fiber in a floating plate on a liquid surface. CONSTITUTION:A light sending optical fiber 7 is provided in a floating plate following up a liquid level on the liquid surface in a liquid tank 1, and an optical fiber sheet 8 is placed so as to be opposed to the fiber 7 through a condenser lens 5 and a glass window 3 of the side wall of the liquid tank 1. Subsequently, an output part 10 is coupled to an image sensor 9 coupled to an output terminal of the sheet 8, and the output part 10 is constituted by connecting an address/ voltage converting circuit 10c through an address detecting circuit 10b to an identification circuit 10a of a photodetecting signal from the sensor 9. In this way, a liquid level can be measured by the fiber interposing the plate 4. |
