Figure 1 (IMAGE)

Compuscript Ltd

Figure 1

Caption

The setup of DAS-Φ-OTDR systems with different demodulation methods. (a) heterodyne detection and I/Q phase demodulation; (b) heterodyne detection and Hilbert transform phase demodulation; (c) direct detection and phase demodulation based on 3×3 coupler; (d) direct detection and phase demodulation based on phase generated carrier algorithm

Credit

OEA

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