| 摘要 |
A transducer for measuring relatively large displacements between relatively movable parts of apparatus, such as the piston (14) and cylinder (12) say of a hydraulic ram (10) comprises as or fixed to one such part an elongate transducer element (20) carrying primary (40) and secondary (42) windings wound longitudinally thereof to generate a magnetic field into or in which the other of the relatively movable parts is movable to vary the magnetic intercoupling between the primary and secondary windings. The other part may be a part of the transducer or of the apparatus itself. Thus, in an hydraulic ram the elongate element may be fixed relative to a cylinder end wall (24) to extend into a longitudinal bore (26) of the piston. Or the bore may be fitted with a sleeve. <IMAGE> |
