A spin drive principle of superconducting rotor and a fiber optic sensor measurement system used in spin superconducting rotor instrument were introduced. The measurement system includes displacement fiber optic sensor

speed fiber optic sensor

motor control fiber optic sensor and signal readout pattern. It not only can gauge suspension micro-displacement and rotation velocity of rotor

but generate some necessary motor control signals to drive rotor. The experimental results of rotor suspension and rotation at liquid helium temperature (4.2K) show that the measurement resolution of superconducting spherical rotor suspension micro-displacement is 10 um and the rotor speed is 1013 rpm

which give some useful references for the further application of fiber optic sensor measurement system to monitor rotor’s operating position accurately.