| 摘要 |
<p>A optical hydraulic control wherein the flow of hydraulic fluid is controlled by movement of a valve spool (12). Movement of the valve spool (12) is initiated by a hydraulic pressure differential that is established by moving a control member (34) out of an equilibrium position. Movement of the control member (34) from its equilibrium position is accomplished by illumination of a composite thermally sensitive beam (38, 40) with an optical command signal. The control member (34) is returned to its equilibrium position after appropriate movement of the valve spool (12) by mechanical linkage between the control member (34) and the valve spool (12) or, alternatively by modulation of the optical command signal.</p> |
