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Research on Optical Fiber Sensor Based on Underwater Deformation Measurement

Ocean College, Zhejiang University, Zhoushan 316021, China
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Sensors 2019, 19(5), 1115; https://doi.org/10.3390/s19051115
Received: 18 January 2019 / Revised: 28 February 2019 / Accepted: 2 March 2019 / Published: 5 March 2019
(This article belongs to the Special Issue Fiber Optic Sensors for Structural and Geotechnical Monitoring)
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Abstract

With the increase in the scale and complexity of underwater engineering, safety problems caused by underwater deformation have become increasingly prominent. Although the intensity fiber curvature sensor can be used for curvature monitoring on the ground, its sensing mechanism is still under investigation. This paper establishes the mathematical model of optical power relative loss and bending radius during deformation of the fiber sensitive region and uses the optical power meter to measure light intensity loss in the sensitive region, which verifies the correctness of the model and reveals the sensing mechanism of the intensity fiber curvature sensor, then optimizes the sensor signal conditioning circuit, applies the sensor to the single-point deformation curvature measurement, and analyzes its measurement error and accuracy. It is proved that the linear measurement range of the sensor is improved when compared with existing similar products. View Full-Text
Keywords: underwater deformation; sensitive region; optical power loss; fiber curvature sensor; measurement range underwater deformation; sensitive region; optical power loss; fiber curvature sensor; measurement range
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Chen, J.; Cao, C.; Huang, Y.; Zhang, Y.; Ge, Y. Research on Optical Fiber Sensor Based on Underwater Deformation Measurement. Sensors 2019, 19, 1115.

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