Abstract
This Paper Introduces A Novel, Cost-Effective, And Durable Strain Sensor With Exceptional Sensitivity And Resolution, Utilizing An Open-Ended Hollow Coaxial Cable Resonator (OE-HCCR). The OE-HCCR Is Characterized By Two Reflective Elements: A Metal Post That Connects The Inner And Outer Conductors At The Signal's Entrance, And A Terminal Flange Near The Coaxial Line's End, Establishing A Variable Gap. The Sensor Employs A Paired Anchor Ring In Conjunction With The Terminal Flange To Transduce And Direct Strain. Variations In The Gap Alter The Resonant Frequency By Modulating The Phase Of The Reflection Coefficient At The Cable's Terminus. Initial Calibration Revealed A Nonlinear Relationship Between The Gap Alteration And The Fundamental Frequency Shift, Achieving A Sensitivity Of 2.5 GHz/mm At A Minimal Gap Of 0.02 Mm. A Low-Temperature Dependence Of 7.887x10⁻⁵ Mm°C (Change In Gap Distance/Celsius) Was Obtained. The Stability Of The Sensor Was Investigated To Obtain A Standard Deviation Of ±2.8 KHz, Corresponding To A Gap Distance Of ±5 Nm And An Equivalent Strain Change Of ±0.06 Με. Real-Time Monitoring Of Mortar Shrinkage Over A 56-Day Period Using Three OE-HCCR Strain Sensors Alongside Three Optical Fiber Extrinsic Fabry-Perot Interferometer (EFPI) Based Displacement Sensors Highlighted Consistent Strain Increase, Although Discrepancies Arose From Sensor Placement And The Complex Nature Of Mortar Hydration. With Its Low Cost, Simplicity, Wide Dynamic Range, Stability, And High Sensitivity, This All-Mechanical Design Sensor Holds Significant Promise For Demanding Industrial Environments.
Recommended Citation
Y. Tang et al., "Enhanced Sensitivity And Robustness In An Embeddable Strain Sensor Using Microwave Resonators," IEEE Transactions on Instrumentation and Measurement, Institute of Electrical and Electronics Engineers, Jan 2024.
The definitive version is available at https://doi.org/10.1109/TIM.2024.3380608
Department(s)
Electrical and Computer Engineering
Publication Status
Early Access
Keywords and Phrases
High Sensitivity; Hollow Coaxial Cable Resonator; Industrial Application; Mechanical Strain Transduction; Monitoring Temperature Stability; Precision Strain Detection; Resonant Frequency Modulation; Structural Health
International Standard Serial Number (ISSN)
1557-9662; 0018-9456
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Institute of Electrical and Electronics Engineers, All rights reserved.
Publication Date
01 Jan 2024
