| 摘要 |
<p>A pneumatic radius sensor is embodied in a fluid bearing, such as an air bearing for a tape transport, to determine the radius of tape wrapped on an adjacent supply or take up reel. The sensor includes a chamber in fluid communication through a plurality of metered orifii to the region of the changing wrap angle of the tape on the air bearing, the plurality of orifii being arranged to provide an essentially linear relationship between pressure in the chamber and the wrap angle of the tape. Pressure sensing means in the chamber senses the pressure therein, so the radius of tape on the adjacent reel can be determined.</p> |
