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. 2022 Feb 2;22(3):1127. doi: 10.3390/s22031127

Figure 2.

Figure 2

Φ-OTDR backscattering principle: (a) Superposition principle of backscattered light from all scattering centers within a half-light pulse width; (b) The effect of vibration on the echo signal, where the variable scattering center is marked in yellow.