Abstract:For the ship health monitoring, it needs to ensure the accuracy and reliability of the strain sensing. To achieve this objective, a fiber Bragg grating (FBG) based on the traceable strain sensor is designed in this study. The strain sensor is optimized with high precision, and it can berepeatedly installed and calibrated. Aspecial calibration devicefor FBGstrainsensorisdesigned.Its measurement valuecan betracedback tothe nationallengthstandard.Theperformanceofthetraceablestrainsensoris evaluatedbyloadingexperiments.Results show that the maximum nonlinear error of the strain sensor is 34 με, and the repeatability is 31 με. These results prove the high accuracy of the proposed strain sensor. In addition, the wave load tests are also implemented in the standard pool simulating, which includes the actual wind and wave environment by installing the proposed traceable strain sensor on the ship structure model. It proves the reliability of the proposed strain sensor. The static loading experiment of the sensor is carried out, and the measured data of the sensor arein agreement with the theoretical calculation results. Therefore, this studyprovides an effective tool for strain sensing, especially forthe ship online health monitoring system.