Fiber bragg grating water content monitoring probe, monitoring system and monitoring method

The invention provides a fiber bragg grating water content monitoring probe, monitoring system and monitoring method, the monitoring probe comprises a shell, a sample pool rack and a fiber bragg grating, a first space is formed in the shell, and a through hole communicated with the first space is formed in the shell; the sample cell rack is arranged in the first space, and a gap exists between the periphery of the sample cell rack and the shell; a sample pool is arranged on the sample pool rack and is used for placing soil to be detected; the fiber bragg grating penetrates through the top of the shell, extends into the first space and extends in the first space in the vertical direction. And the fiber bragg grating comprises a force measuring grating positioned above the sample cell rack and a temperature compensation grating positioned below the sample cell rack. Compared with the prior art, the fiber bragg grating water content monitoring probe measures the soil water content according to the weight change