Fig. 1. Schematic of the new demodulation algorithm

Fig. 2. Single frequency signal simulation of different frequencies. (a) The frequency is 500 Hz; (b) The frequency is 1 000 Hz; (c) The frequency is 1 500 Hz; (d) The frequency is 2 000 Hz; (e) The frequency is 2 500 Hz; (f) The frequency is 3 000 Hz

Fig. 3. Signal restore of 500 Hz during different interference intensity. (a) B =1 mW; (b)B =2 mW; (c) B = 3 mW; (d) B = 4 mW

Fig. 4. VI of PGC-DCM and new method

Fig. 5. Test of the influence of light intensity disturbance on the demodulation result of PGC-DCM and the new method. (a) B=0.5 mW; (b) B =1 mW; (c) B = 2 mW; (d) B = 3 mW

Fig. 6. Experiment architecture

Fig. 7. Schematic diagram of system experimental setup

Fig. 8. Performance of new method tested by different light intensity. (a) Light power is 10 mW; (b) Light power is 20 mW; (c) Light power is 30 mW; (d) Light power is 40 mW