High Precision Measurement of High Frequency Dynamic Strain of Aerospace Structures with FBG Strain Sensors

Fiber Bragg grating (FBG) strain sensors are widely used in strain measurement of aerospace structures. FBG strain sensors have received widespread attention as an important strain testing method. With the continuous development of the aerospace manufacturing industry, the dynamic properties of new spacecraft materials have been rapidly improved, and dynamic strain testing has extremely high requirements for FBG strain sensors. The measurement characteristics of FBG sensors often change with the frequency of the measured strain signal. Therefore, current dynamic strain measurements cannot accurately obtain the strain magnitude of aerospace structures. In this paper, a high-precision measurement and error analysis method with FBG sensors is proposed to obtain high-frequency dynamic strains of aerospace structures. The measurement errors under different amplitude and frequency of dynamic strain are obtained. Experiment results show that the maximum error is only 36 με. Accurate and reliable measurement of high-frequency dynamic strain of aerospace structures using FBG strain sensors is realized.