A Fiber Bragg Grating Stress Sensor for Hull Local Strength Measurement

Abstract

In this paper, a fiber grating stress sensor for measuring the local strength of the hull is introduced. The optical fiber stuck between the fixed plates on both sides of the sensor is deformed when the part of the hull in which the sensor is mounted is subjected to an external force, causing the wavelength of the fiber grating to change. The local intensity variation of the hull will be solved by the wavelength variation of the fiber grating. The meter shows that the deformation of the fiber grating is linear with the wavelength change of the fiber grating. To this end, the compensation algorithm of the demodulator can change the stress of the hull structure and the wavelength of the fiber grating. Therefore, the sensor enables real-time monitoring of local stresses in the ship’s structure in harsh marine environments.