Brillouin-scattering-based water hardness monitoring method

The invention discloses a brillouin-scattering-based water hardness monitoring method. The water hardness monitoring method comprises a data storage stage and a water area monitoring stage. In the data storage stage, a data storage device used for storing brillouin scattering signals of water with different hardness is used for respectively adding soft water, slightly hard water, hard water and extremely hard water into a long-cylinder-shaped glass slot; incident laser is used for simulating backward brillouin scattering signals in the long-cylinder-shaped glass slot; a first computer is used for analyzing and processing the acquired backward brillouin scattering signals and laser power recorded by a first power meter and a second power meter, and storing relevant data. In the water area monitoring stage, the water hardness of the large-range water area is monitored according to the stored signal data; the backward brillouin scattering signals are simulated when the laser transmits in the large-range water area; a second computer is used for analyzing the acquired backward brillouin scattering signals and comparing the acquired backward brillouin scattering signals with the stored brillouin scattering signal data to obtain the hardness of the detected water area. The detection requirement of the large-range water area is met.