Fiber Strain Measurement for Wide Region Quasidistributed Sensing by Optical Correlation Sensor with Region Separation Techniques

<table>Schematic of fiber-optic pulse correlation sensing mechanism.  PBS: polarization beam splitter; SHG: second harmonic generation; APD: avalanche photo diode.</table>

Journal of Sensors

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Figure 2

Figure 2: Fiber Strain Measurement for Wide Region Quasidistributed Sensing by Optical Correlation Sensor with Region Separation Techniques 