Millimeter-Scale Spatial Resolution Raman Sensing System Enabled by Bidirectional Fiber Laser

Le résumé fourni par la source

We report a high-spatial-resolution distributed temperature sensing system using an asynchronous mode-locked fiber laser. It employs two picosecond pulse trains with a 6,100 Hz repetition rate difference. One is amplified as pump light (~46 ps) to excite Raman scattering, while the other serves as an asynchronous probe. A low-speed data acquisition card with short aperture time and a broadband avalanche photodetector are used to achieve millimeter-level resolution. Experiments under high-temperature gradients demonstrate 9.2 mm spatial resolution over ~2 meters of fiber. The asynchronous sampling enables full waveform acquisition within 163 μs, greatly improving efficiency. This is the first application of a bidirectional ultrafast laser in distributed sensing, offering strong potential for OTDR-based systems.

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