| 摘要 |
At least one self-powered light source is mounted on the tail rod of a BOP to provide an indication of the position of the ram of the BOP. The light source moves back and forth with the ram actuating piston of the BOP. Opposite the light source is a light-receiving lens. The lens is coupled by optical fiber to a optical to electrical converter. As the BOP is actuated, the tail rod moves, thereby moving the light source to a position adjacent a different lens. The lens which is now positioned adjacent the light source sends a light signal to its respective converter, thereby indicating the position of the tail rod and thus to ram of the BOP.
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