| 摘要 |
PURPOSE:To enable continuous and optical detection of an infiltration liquid and the liquid level and liquid pressure thereof without being affect by poorer transmission of a light due to sludgy water or the like, by building one end of an optical fiber cable section into a shaft section of an inner cylinder. CONSTITUTION:This apparatus is made up of an inner cylinder 1 having a shaft section above a cylinder with the lower end thereof opened 2, an outer cylinder 4 containing the inner cylinder 1 and a photosensor 9 in which an end piece of an optical fiber cable section is built into a shaft section 3 of the inner cylinder 1 while the tip thereof allows the passage of light through a hollow section in the cylinder. Then, when the inner cylinder 1 of a liquid level detection sensor 12 is filled with a silicon oil 10, the height point h0 of a hollow section 11 is made known and the silicon oil 10 in the inner cylinder 1 rises with a level of water infiltrated to increase the height by h. As h/h0=alpha and changes in alpha can be detected with the photosensor 9, the level or pressure of the water infiltrated can be measured quantitatively. The larger the value of h0, the more sensitive the quantitative detection of the water level or pressure can be thereby achieving a higher measuring accuracy. |
