Fig. 1. Schematic diagram of distance measurement system

Fig. 2. Transmission spectrum of FBG

Fig. 3. Microwave interference spectrum.

Fig. 4. Measurement result

Fig. 5. Spectrum of measurement when target at 400 mm

Fig. 6. Result of measurement stability when target at 400 mm

Fig. 7. Result of measurement stability

Fig. 8. Frequency spectrum of measurement stability.

Fig. 9. Result and deviation of measurement accuracy