研究目的
Investigating the effectiveness of an improved φ-OTDR system assisted by a weak fiber Bragg grating (wFBG) array for detecting partial discharge (PD) in 10KV power cables.
研究成果
The improved DAS system based on φ-OTDR assisted by wFBG array demonstrates potential for remote and on-line PD detection in power transmission networks, with high sensitivity and broadband frequency response.
研究不足
The system's performance may be affected by environmental noise and the physical constraints of the fiber packaging method.
1：Experimental Design and Method Selection:
The system integrates a wFBG array into the sensing fiber to improve SNR and uses an aluminum foil package to enhance sensitivity.
2：Sample Selection and Data Sources:
A section of a cable with an artificially fabricated defect was used as the PD source.
3：List of Experimental Equipment and Materials:
Includes a narrow linewidth laser, semiconductor optical amplifier (SOA), erbium-doped fiber amplifiers (EDFA1 and EDFA2), band-pass filter, 3×3 optical coupler, and Faraday rotating mirrors (FRMs).
4：Experimental Procedures and Operational Workflow:
The system detects acoustic signals generated by PD at 10KV, with the sensing fiber layout and PD generator setup detailed.
5：Data Analysis Methods:
A 3×3 coupler demodulation algorithm is used to obtain the phase, and fast Fourier transform is performed on the time domain signal for spectrum analysis.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容-
semiconductor optical amplifier
SOA
Modulates continuous wave light into pulsed light
-
erbium-doped fiber amplifier
EDFA1
Amplifies the pulse light
-
erbium-doped fiber amplifier
EDFA2
Amplifies the back-reflected pulses
-
band-pass filter
Eliminates ASE noise
-
3×3 optical coupler
Reflects pulsed light and allows interference of reflected light from adjacent wFBGs
-
Faraday rotating mirrors
FRMs
Reflects light at the end of the long arm and short arm of a Michelson interferometer
-
登录查看剩余4件设备及参数对照表
查看全部
