Recent Advances in Multidimensional Fiber Bragg Grating Accelerometers

Fiber Bragg grating (FBG) accelerometers measure vibrations by demodulating wavelength shifts induced by dynamic strain. Their high-temperature resistance and multiplexing capabilities provide them with opportunities for quasi-distributed applications in harsh environments. The basic principle of an FBG accelerometer is based on vibration-strain coupling. In the design of a sensor's mechanical structure, improving the coupling efficiency can effectively enhance the sensitivity of the accelerometer. Moreover, an FBG accelerometer can be developed as a multidimensional sensor, which is a unique feature compared to distributed-fiber vibration-sensing technology. In this paper, we review the recent advances in FBG accelerometer developments and by focusing on two main trends: sensitivity enhancement and orientation identification. We emphatically introduce new techniques for FBG accelerometers including hybrid strain loading, thin-cladding fiber FBGs, multicore FBGs and cladding FBGs.

Automated summary

Fiber Bragg grating (FBG) accelerometers measure vibrations through wavelength shifts caused by dynamic strain. Their high temperature resistance and multiplexing capabilities make them suitable for quasi-distributed applications in harsh environments. Improving the coupling efficiency in the sensor's mechanical structure can enhance the sensitivity of the FBG accelerometer. Additionally, the FBG accelerometer can be developed as a multidimensional sensor, which distinguishes it from distributed-fiber vibration-sensing technology. This paper reviews recent advances in FBG accelerometer developments, focusing on sensitivity enhancement and orientation identification. New techniques such as hybrid strain loading, thin-cladding fiber FBGs, multicore FBGs, and cladding FBGs are introduced.