Weak-Reflection Fiber Bragg Grating Strain Monitoring Sensing Cable

The weak-reflection fiber Bragg grating strain monitoring sensing cable consists of a weak-reflection fiber Bragg grating covered with a heat-cured GFRP glass-fiber protective layer, followed by a thermoplastic HDPE outer sheath. The strain fiber is in close contact with the outer sheath, enabling real-time sensing of external stress changes. The product offers certain mechanical strength, good toughness, and resistance to water, corrosion, and outdoor sunlight and rain. It has a certain rigidity, straightens naturally when released, and recovers immediately after bending is released. It is suitable for long-distance straight-line installation and for surface-mounted and adhesive installation. It is widely used in health monitoring of large buildings and in vibration sensing monitoring of utility tunnels, pipelines, and railway subgrades.