Application of a Novel Long-Gauge Fiber Bragg Grating Sensor for Corrosion Detection via a Two-level Strategy
Abstract
:1. Introduction
2. Long-Gauge Fiber Optic Sensor
3. Two-Level Corrosion Detection Strategy Based on FBG Sensors
3.1. Framework of the Proposed Method
3.2. Theoretical Basis of the Proposed Method
3.2.1. Strain Flexibility Identification
3.2.2. Two-Level Corrosion Detection
4. Numerical Example of a Steel Beam
5. Experimental Verification through a Reinforced Concrete (RC) Beam
5.1. Description of the Experimental Setup
5.2. Accelerated Corrosion Procedure
5.2.1. Calibration Test
5.2.2. Corrosion Setup
5.3. Two Level Strategy for Corrosion Damage Quantification
5.3.1. Level 1: Corrosion Damage Localization
5.3.2. Level 2: Corrosion Damage Quantification
6. Conclusions
- (1)
- Based on the long-gauge FBG strain sensors, a new kind of corrosion detection methodology via impact test is proposed and demonstrated.
- (2)
- The original contribution of this paper is the development of a step-by-step strategy that helps to locate and quantify corrosion damage by using a long-gauge FBG sensor; a solid theoretical basis has been developed to guarantee that this sensor will detect corrosion accurately.
- (3)
- The proposed two-level corrosion detection methodology presents a distinct advantage in that locating Level 1 damage significantly reduces the number of unknown parameters in the sensitivity equations and increases the success of Level 2 corrosion quantification.
7. Patents
Author Contributions
Funding
Conflicts of Interest
Appendix A. Relationship between Modal Mass and Modal Scaling Factor
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Damage Location | Element 5 | Element 9 | ||||
---|---|---|---|---|---|---|
Damage Quantification | Theoretical Value () | Experimental Value () | Error (%) | Theoretical Value () | Experimental Value () | Error (%) |
Case 1 | 1.16 | - | - | - | ||
Case 2 | 0.97 | - | - | - | ||
Case 3 | 1.93 | 6.2 |
Short Specimen (325 mm) | Long Specimen (1000 mm) | ||||||
---|---|---|---|---|---|---|---|
Time (h) | Residual Mass (g) | Lost Mass (g) | Weight Loss Ratio (%) | Residual Mass (g) | Lost Mass (g) | Weight Loss Ratio (%) | Mean of the Ratio (%) |
0 | 454.5 | 0 | 0 | 1517.07 | 0 | 0 | 0 |
2 | 448 | 6.5 | 5.96 | 1510.65 | 6.42 | 5.44 | 5.7 |
4 | 441.5 | 13 | 11.92 | 1504.37 | 12.7 | 10.76 | 11.34 |
6 | 435 | 19.5 | 17.88 | 1497.89 | 19.18 | 16.25 | 17.1 |
8 | 429 | 25.5 | 23.38 | 1491.55 | 25.52 | 21.62 | 22.5 |
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Cheng, Y.; Zhao, C.; Zhang, J.; Wu, Z. Application of a Novel Long-Gauge Fiber Bragg Grating Sensor for Corrosion Detection via a Two-level Strategy. Sensors 2019, 19, 954. https://doi.org/10.3390/s19040954
Cheng Y, Zhao C, Zhang J, Wu Z. Application of a Novel Long-Gauge Fiber Bragg Grating Sensor for Corrosion Detection via a Two-level Strategy. Sensors. 2019; 19(4):954. https://doi.org/10.3390/s19040954
Chicago/Turabian StyleCheng, Yuyao, Chenyang Zhao, Jian Zhang, and Zhishen Wu. 2019. "Application of a Novel Long-Gauge Fiber Bragg Grating Sensor for Corrosion Detection via a Two-level Strategy" Sensors 19, no. 4: 954. https://doi.org/10.3390/s19040954
APA StyleCheng, Y., Zhao, C., Zhang, J., & Wu, Z. (2019). Application of a Novel Long-Gauge Fiber Bragg Grating Sensor for Corrosion Detection via a Two-level Strategy. Sensors, 19(4), 954. https://doi.org/10.3390/s19040954