Curved Trench Platform for FBG Strain Isolation
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Solution Overview
Problem
Existing sensing technologies using optical fibers with Fiber Bragg Grating (FBG) sensors face challenges in effectively isolating strain measurements, as strain can transfer between sensors along the optical fiber, leading to inaccurate readings.
Innovation Solution
The proposed solution involves placing FBG sensors in a platform with a trench that has curved sections, allowing each sensor to have a line contact along the curved sections of the trench, which reduces strain transfer between sensors and localizes strain measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If FBG sensors are placed along a straight optical fiber, then the sensing system can detect strain and temperature, but strain transfers between sensors along the fiber leading to inaccurate readings
Solution Approach 1:
The patent applies curvature to the optical fiber path by routing it through a trench with curved sections. This curvature creates line contact between the fiber and trench sidewalls, which provides friction-based strain isolation. The curved geometry prevents strain transfer between sensors while maintaining their positioning stability, thus improving both measurement precision and reliability
2Measurement precision
If FBG sensors are isolated from each other, then strain measurement accuracy improves, but the complexity of the sensing system increases
Solution Approach 1:
The patent segments the strain field by using curved trench sections that create isolated contact zones for each FBG sensor. Each curved section acts as an independent strain isolation unit, preventing strain transfer between sensors. This segmentation approach achieves measurement precision improvement without requiring complex external isolation mechanisms
Solution Approach 2:
The curved trench sidewalls serve as an intermediary structure between the sensors and the measured object. The friction contact at the curved interfaces acts as a mediator that blocks strain transfer while maintaining sensor positioning, providing a simple yet effective solution that avoids complex isolation systems
Data Source
AI summary
Apparatuses and methods therefor generally relate to sensing. In one example of such an apparatus, there is a platform. An optical fiber with Fiber Bragg Grating sensors is located in a trench formed in the platform. The trench has curved sections. The Fiber Bragg Grating sensors are respectively in the curved sections of the trench.