Fig. 1. Simulation results of dual-wavelength phase unwrapping. (a) Three interference signals of 1310 nm; (b) wrapped phases of λ1, λ2 and the synthetic wavelength; (c) wrapped phase of synthetic wavelength after zero processing and unwrapping; (d) results with segmentation phase compensation; (e) error correction of segmentation compensation

Fig. 2. Schematic diagram of experimental system

Fig. 3. Demodulation results when the optical path difference is sinusoidal function. (a) Three interference signals of 1310 nm; (b) three interference signals of 1550 nm; (c) wrapped phases of λ1, λ2 and the synthetic wavelength; (d) unwrapped phases of λ1, λ2 and the synthetic wavelength; (e) θ'1 and θ1 before and after phase compensation; (f) enlarged view of the region in the rectangular box in Fig. (e)

Fig. 4. Demodulation curves of the vibration with triangular function and rectangular function. (a) Three sampling signals of λ1 under the vibration with triangular function; (b) demodulation result of the triangular function; (c) sample signals of λ1 under the vibratory with rectangular function; (d) demodulation result of the rectangular function