Abstract: This paper mainly describes the basic principle of LIF technology and its application in water source identification, and analyzes the structure of LIF technology and design of the main components. Through fluorescence experiment with water samples of one mine in the LIF system, the fluorescence spectra of the unknown samples was obtained. Traditional water source identification is mainly based to the ion concentration representative of the water, but it is hard to analyze the ion concentration of the water with the fluorescence spectrum. This paper proposes a more simple and practical method for precise water source identification with fluorescence spectrum, which corresponding analysis software is used to measure the Euclidean distance between unknown water samples and standard samples and then get an accurate classification of the unknown samples. Water source identification for unknown samples verifies the feasibility of the LIF system, and solves the problem that the current coal mine can’t have a better, real-time and online monitoring on water inrush, which is of great significance for coal mine safety in production.

Key words: LIF, water source identification, fluorescence spectra, Euclidean distance