Fiber Grating Sensor Insert for Intelligent Plastic Pipe
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Solution Overview
Problem
Fiber grating sensors face challenges when implanted in industrial continuous extrusion processes of plastic pipes, as they are prone to debonding, shifting, or breaking due to erosion corrosion from fluids inside the pipe, and external environmental factors, affecting their accuracy and lifespan.
Innovation Solution
A strip-shaped fiber grating sensor insert with reinforcing fibers and matrix resin is implanted obliquely during the continuous extrusion molding process, ensuring the sensors are buried within the pipe and maintaining their functionality, with the matrix resin and fibers being compatible with the pipe material to enhance strength and compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fiber grating sensor is attached to the inner surface of the pipe, then the sensor can monitor internal parameters, but the sensor is liable to debond, shift and breakage due to erosion corrosion of the fluid
Solution Approach 1:
The fiber grating sensor is embedded within a protective housing structure that is integrated into the pipe wall, creating a nested configuration where the sensor is protected from direct exposure to corrosive fluids while maintaining its monitoring function
Solution Approach 2:
A protective coating or housing material is introduced as an intermediary between the sensor and the corrosive fluid, allowing the sensor to monitor internal parameters without direct contact with the eroding fluid
2Reliability
If fiber grating sensor is attached to the outer surface of the pipe, then the sensor is protected from fluid corrosion, but the sensor is prone to breakage and inactivation due to bad construction or working environment
Solution Approach 1:
The sensor is embedded within the pipe wall structure rather than being mounted on the external surface, providing mechanical protection while maintaining sensing capability through the pipe wall
3Reliability
If fiber grating sensor is implanted in the pipe during continuous extrusion process, then the sensor survival rate and test accuracy are improved, but the implantation process becomes extremely difficult
Solution Approach 1:
The fiber grating sensor is pre-installed into a protective housing or embedding structure before the pipe extrusion process begins, allowing the sensor to be incorporated into the pipe wall during continuous extrusion without requiring complex post-manufacturing implantation steps
Solution Approach 2:
The sensor implantation process is merged with the pipe extrusion process itself, where the sensor and protective housing are introduced into the extrusion die and embedded in the pipe wall as the material is being formed, eliminating the need for separate implantation operations
Data Source
AI summary
A fiber grating sensor insert, implanting system and method of an intelligent plastic pipe. A fiber grating sensors' strip-shaped insert is accurately implanted in an oblique guiding manner in the pipe's outer surface during the continuous extrusion molding process of the plastic pipe, so that temperature and strain sensors implanted beforehand in strip-shaped insert are buried in the pipe, and the sensors' survival in a bad pipe manufacturing and working environment is ensured, real-time online monitoring on parameters of the pipe such as temperature, strain, pressure and the like is achieved, the conventional continuous extrusion process technology of plastic pipes is combined with optical fiber communication technology, and the manufactured intelligent plastic pipe can achieve real-time online monitoring of temperature, strain, pressure and other parameters, and then can realize the safety early warning, fault diagnosis and automatic control of urban pipe networks, thereby effectively promoting the construction of “smart cities”.