Study on the anti-vibration performance of a metal tube armored fiber grating sensing probe.

• Systematic study on the effects of external environmental vibrations on fiber gratings for different sized capillary metal tube packaging methods. • A research method is applied that selects the optimal packaging method under different vibration environments, to reduce the impact of vibrations on the proposed fiber gratings. • This work is based on theoretical research, simulation and numerous experimental verifications. Given the current limitations of traditional electrical sensors in practical engineering applications, alongside the difficulties of temperature monitoring in key components of industrial equipment, we propose a novel passive sensor based on fiber Bragg grating (FBG) that is encapsulated in a capillary metal tube. In addition, to provide a solution to the cross-sensitivity problem of the FBG sensor on measuring vibrations and temperature, this paper analyzed the influence of environmental vibrations on the FBG temperature sensor. This was achieved, in detail, through vibration experiments on the FBG sensor. The results showed that account should be performed for the interference of the FBG temperature sensor with factors such as environmental vibrations, acceleration, and the first-order natural frequency of the metal tube that was used in the packaging. Finally, an optimal analysis method for a metal tube armored fiber grating sensor is proposed. [ABSTRACT FROM AUTHOR]