| 摘要 |
A borehole pressure sensing system includes a tool having an outer shell having an end which enters a borehole, traversing an earth formation, first. The end has an opening extending from the interior of the tool to the borehole. A pressure sensitive device is inserted in the opening. Bourdon-tube apparatus is arranged with the pressure sensitive device so that as the borehole pressure changes the bourdon-tube apparatus will change its rotational position around the longitudinal axis of the opening. An encoder includes a mask having opaque and translucent areas and is affixed to the bourdon-tube apparatus so that as the bourdon-tube apparatus changes its position, the mask is rotated accordingly. A light grate, spatially related to the mask, divides a received light beam to provide a plurality of light beams in a manner to impinge on the mask. A transmission subsystem of light conductors comprises one conductor which conducts light from the surface to the grate. A plurality of conductors in the transmission subsystem is arranged with the grate and the mask so that the mask is between the grate and the light conductors which conduct any of the plurality of light beams passing through the mask. Surface apparatus includes a source of light arranged with the one conductor of the transmission subsystem so as to provide light to the one conductor.
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