Theoretical and experimental study on fiber-optic displacement sensor with bowknot bending modulation
| Autor: | Da Huang, Yong Zheng, Zheng-Wei Zhu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Optical fiber
Materials science Acoustics Detector 02 engineering and technology Bending 01 natural sciences Atomic and Molecular Physics and Optics Displacement (vector) Electronic Optical and Magnetic Materials law.invention 010309 optics Shear (sheet metal) 020210 optoelectronics & photonics Control and Systems Engineering law 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Calibration Direct shear test Sensitivity (control systems) Electrical and Electronic Engineering Instrumentation |
| Zdroj: | Optical Fiber Technology. 41:12-20 |
| ISSN: | 1068-5200 |
| DOI: | 10.1016/j.yofte.2017.12.008 |
| Popis: | A novel and simple fiber-optic sensor for measuring a large displacement range in civil engineering has been developed. The sensor incorporates an extremely simple bowknot bending modulation that increases its sensitivity in bending, light source and detector. In this paper, to better understand the working principle and improve the performance of the sensor, the transduction of displacement to light loss is described analytically by using the geometry of sensor and principle of optical fiber loss. Results of the calibration tests show a logarithmic function relationship between light loss and displacement with two calibrated parameters. The sensor has a response over a wide displacement range of 44.7 mm with an initial accuracy of 2.65 mm, while for a small displacement range of 34 mm it shows a more excellent accuracy of 0.98 mm. The direct shear tests for the six models with the same dimensions were conducted to investigate the application of the sensor for warning the shear and sliding failure in civil engineering materials or geo-materials. Results address that the sliding displacement of sliding body can be relatively accurately captured by the theory logarithmic relation between sliding distance and optical loss in a definite structure, having a large dynamic range of 22.32 mm with an accuracy of 0.99 mm, which suggests that the sensor has a promising prospect in monitoring civil engineering, especially for landslides. |
| Databáze: | OpenAIRE |
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