| 摘要 |
A liquid level indicator which includes a plurality of pairs of optical fibers and a common carrier supporting at least an end portion of each fiber. The carrier is formed with an elongated passage into which, in use, liquid flows to a height dependent on the liquid level to be monitored. The end portions of each pair of fibers are separated by the passage and have their axes generally coextensive, while the end portions of adjacent pairs of fibers are spaced apart along the passage. The end surfaces of end portions of each pair of fibers are inclined at an acute angle to the axis of the fibers such that transmission of light from one fiber to the other is substantially prevented if the liquid does not fill the region of the passage between the fibers, while light is transmitted between the fibers if the region of the passage is filled with the liquid.
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