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针对目前φ-OTDR光纤分布式振动传感器由于散射光波光强不稳定造成误报率较高的问题,文中提出一种φ-OTDR和Mach-Zehnder干涉仪相结合的光纤分布式振动传感新系统,φ-OTDR和Mach-Zehnder干涉仪分别对外界振动进行探测,从而降低单一φ-OTDR探测的误报率。实验研究了φ-OTDR和提出的新的复合结构系统对外界振动探测的误报率,实验结果表明:在复杂环境下,与现有φ-OTDR方案相比,提出的基于φ-OTDR和M-Z干涉仪复合结构的方案可以有效降低系统的误报率,使系统的误报率由单一φ-OTDR的25%降至2%。
Aiming at the problem that the false positive rate of φ-OTDR optical fiber distributed vibration sensor is high due to the unstable light intensity of scattered light, a novel optical fiber distributed vibration sensing system combining φ-OTDR and Mach-Zehnder interferometer is proposed in this paper. , φ-OTDR and Mach-Zehnder interferometer to detect external vibration separately, so as to reduce the false alarm rate of single φ-OTDR detection. The experimental results show that the φ-OTDR and the proposed new composite structure system can detect the false alarm rate of external vibration. The experimental results show that compared with the existing φ-OTDR scheme, the proposed method based on φ-OTDR and MZ Interferometer composite structure of the program can effectively reduce the false alarm rate system, the system false alarm rate from 25% single φ-OTDR dropped to 2%.