| 摘要 |
<p>A transducer for measuring displacement comprises a transducer assembly in which there is a coil (22) wound about an axis (A) and energisable to generate a magnetic field, and first and second magnetic field sensor devices (MFSI, 2), that are axially spaced with the coil therebetween, each device being in proximity to the coil to respond to a magnetic field component generated by energisation of the coil. A ferromagnetic member (30) is disposed to interact with the field generated by the coil, the ferromagnetic member and the transducer assembly being mounted for relative displacement in the direction of said axis, such that the balance of the respective field components sensed by the first and second sensor devices is a function of the axial position of the ferromagnetic member relative to the transducer assembly. 20Hz- 100Hz AC pulses (220) through a ferromagnetic tube (10). Also two coils (212, 214) and one sensor device (218). Also torque of a shaft (210).</p> |
