| 摘要 |
A photoelectric leak detector system for double-walled tanks and the like including a pair of optical fibers extending substantially from the top to the bottom of the annulus of the double-walled tank, a glass plate in contact with the lower ends of the optical fibers and spaced from the bottom of the annulus, a light source juxtaposed to the upper end of one of the optical fibers to pass light therethrough, and a photodiode juxtaposed to the upper end of the other optical fiber to detect changes in the reflected light issuing therefrom.
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