| 摘要 |
A highly efficient position or liquid level sensing system includes a central fluorescent fiber or rod, a transparent support for mounting the fluorescent fiber preferably in a liquid container or tank, and a float or other movable member extending around the fluorescent fiber for movement relative to the fiber. Light is directed from one end of the fluorescent fiber parallel to and around the fiber; and the side of the float or movable member facing the light reflects the incident light inward toward the fluorescent fiber. A first detector receives radiation from one end of the fiber. Detectors may be provided at both ends of the fiber, and the two outputs may be combined sustractively to provide a substantially linear signal output relative to the position of the float or movable member.
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