Patent ID: 11874146
Assignee: ZHEJIANG LAB
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A distributed acoustic sensing (DAS) system based on random fiber lasing amplification (RFLA) and a Rayleigh scattering enhanced fiber (RSEF), comprising an DAS demodulation unit, a high-order random fiber lasing amplification (RFLA) unit and a RSEF, wherein the high-order RFLA unit comprises a high-order random fiber laser (HRFL), an adjustable attenuator, a reflector and a wavelength division multiplexer (WDM); pulsed light output by the DAS demodulation unit is injected into the RSEF by a reflection end of the WDM as detection signal light; after pump light output by the HRFL is injected into the RSEF by a pass port of the WDM, the HRFL and the reflector form a pumping structure in the RSEF, and cascaded random fiber lasing is generated by stimulated Raman scattering gain combined with distributed backward feedback; the generated cascaded random fiber lasing is configured to perform distributed amplification on the pulsed light, and enhanced backscattered signal light generated by the amplified pulsed light returns to the DAS demodulation unit; and the enhanced backscattered signal light is demodulated to implement long-distance distributed acoustic sensing with a high signal-to-noise ratio.