Monitoring system and method for broken wires in PCCP based on distributed optical fiber sensing

US12399132B2 · kind B2 · utility

Inventors

• Yixin Zhang · Dresden, DE
• Shuai Tong · 安丰镇, CN
• Xuping Zhang · Nanjing, CN
• Shaoxiong Tang · 安丰镇, CN
• Ruofan Wang · Natick, US
• Haoran Wang · Zhejiang, CN
• Shun Wang · 安丰镇, CN
• Feng Wang · Nanjing, CN

Key dates

• Filing date: Jul 24, 2023
• Grant date: Aug 26, 2025
• Expiry date: Feb 12, 2044

Classification

• Technology area (CPC G): Physics
• CPC primary: G01M11/3109
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A monitoring system and method for broken wires in PCCP based on distributed optical fiber sensing relates to the technical field of optical fiber sensing. The monitoring system for broken wires in PCCP comprises a Sagnac interferometer, a Φ-OTDR system, a dual loopback system and a signal processing system. The Sagnac interferometer comprises a first laser, a first optical coupler, a first delay optical fiber, a Faraday rotating mirror and a first photodetector. The Φ-OTDR system comprises a second laser, a second optical coupler, an acousto-optic modulator, a circulator, a third optical coupler and a second photodetector. The dual loopback system comprises a wavelength division multiplexer and a second delay optical fiber. The invention solves the problems of low positioning accuracy, limited frequency measurement range, detection dead zone and high computing pressure in monitoring broken wires in PCCP.