Fig. 1. Schematic of the clearance measurement system based on frequency-swept interference

Fig. 2. Schematic of rotor-stator axial clearance measurement. (a) Schematic of the rotor-stator axial clearance of the aeroengine and measuring point of the probe; (b) the real-time rotor-stator axial clearance and the clearance desired to be measured at the measuring point

Fig. 3. Rotor-stator axial clearance simulation experimental platform

Fig. 4. Testing results of the measurement range of the prototype

Fig. 5. Experimental results of simulated rotor-stator axial clearance measurement. (a) Whole testing result in the case of rotational rotor; (b) the enlarged region of the measurement result when the rotor and motorized stage start; (c) the enlarged region of the measurement result at 10 mm clearance; (d) the enlarged region of the measurement result when the motorized stage stops

Fig. 6. Measurement error