Abstract
A displacement sensor is constructed using a YBCO superconductor. Its construction consists of an excitation coil, a differential coil, and a superconducting YBCO rod. The inductance of the differential coil decreases as a result of perfect diamagnetism (the Meissner effect) when the YBCO rod enters the coil. The YBCO rod can be shifted by as much as ±12 mm in the center of differential coil, along the axis of the rod by moving the holder attached to the rod. The relationship between the output voltage of the differential coil and the displacement of the rod is measured by a lock-in amplifier. Experimental results indicate that the displacement sensor has good characteristics. Among them are sensitivity, linearity, stability, frequency dependence, and nonhysteresis. Along with the above results, the electrical properties of the superconducting materials are also examined, comparing them with those of ferrite and soft iron.
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