Fiber Bragg Grating Screw for EMI-Resistant Strain Monitoring
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Solution Overview
Problem
Conventional screw fastening systems fail to accurately detect and transmit physical characteristics due to electromagnetic interference (EMI) affecting electronic resistance strain gauges, limiting their ability to provide real-time data in modern applications.
Innovation Solution
Integration of a fiber Bragg grating (FBG) into screw fasteners to sense physical characteristics by measuring optical wavelength changes, replacing traditional resistance strain gauges with optical fibers that are less susceptible to EMI, allowing for precise measurement of pretightening load forces and strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electronic resistance strain gauges are used to detect physical characteristics in screw fasteners, then measurement capability is provided, but electromagnetic interference distorts the signal and reduces measurement precision
Solution Approach 1:
The patent replaces electronic resistance strain gauges with fiber Bragg grating (FBG) sensors embedded in the screw fastener. FBG sensors use optical fiber technology instead of electronic circuits, substituting optical measurement principles for electrical resistance measurement. This substitution eliminates susceptibility to electromagnetic interference while maintaining strain detection capability through optical wavelength shifts.
Solution Approach 2:
The patent introduces optical fiber as an intermediary medium between the strain measurement function and the external environment. The FBG sensor uses optical wavelength modulation to transmit strain information, with the optical fiber acting as an immune transmission medium that isolates the measurement system from electromagnetic interference in harsh environments.
2Adaptability or versatility
If conventional screw fasteners are used to connect structures, then mechanical fastening function is achieved, but physical characteristic detection and signal output capability are lost
Solution Approach 1:
The patent transforms the conventional single-function screw fastener into a multi-functional intelligent fastener by embedding FBG sensors within the screw structure. The fastener simultaneously provides mechanical connection and physical characteristic detection functions, enabling strain, temperature, and stress monitoring without requiring separate sensing devices.
Solution Approach 2:
The patent merges the structural fastening function and the sensing function into a single integrated component. The FBG sensor is embedded within the screw body, combining the mechanical fastening element with the optical sensing element into one unified intelligent fastener system.
3Reliability
If fiber Bragg grating sensors are embedded in screw fasteners, then resistance to electromagnetic interference is improved, but manufacturing complexity increases
Solution Approach 1:
The patent incorporates the FBG sensor into the screw manufacturing process at an early stage, embedding the optical fiber during screw production rather than as a post-manufacturing modification. This preliminary integration allows the sensor to be manufactured concurrently with the fastener structure, reducing overall manufacturing complexity.
Solution Approach 2:
The patent nests the FBG sensor within the screw structure, placing the optical fiber inside the screw body or along its length. This nested configuration allows the sensing element to be integrated within the structural element, utilizing the screw's existing geometry to accommodate and protect the optical fiber.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The fiber sensing screw system provides accurate, real-time data on physical characteristics with improved resistance to electromagnetic interference, enabling reliable monitoring and control in harsh environments, and can be used in various engineering applications.
Implementation Method 1
a sensing technique implemented through a physical sensing unit or apparatus that includes a sensing screw structure with fiber Bragg grating (FBG)
Data Source
AI summary
An apparatus includes a sensing screw capable of providing synchronous both pre-drawing of fiber Bragg grating and pre-tightening of bolt with induced characteristics to detect feedback control of large scale public engineering structures or precise equipments to facilitate fabrication of precise elements to achieve more precise control and record fabrication processes. Through the sensing screw apparatus a precision system structure can be formed to meet expectation of improved product quality and comprehensive recording of complete production process and physical characteristics at important points of the production process. The invention can provide instant onsite status and accumulate data or make parameter pre-action to avoid error accumulation, thereby improve production yield or safety of large scale structures.