Equipment Of Detecting And Analyzing Water Using LIF Based On MUL

This paper described the physical mechanism of UV laser-induced fluorescence, analysis the mechanisms and regulations of UV laser excitation and detection. Using high peak power, high repetition rate, Q-switching of microchip UV laser as the excitation light source, design a smart and lightweight water quality analyzer prototype. The entire system is composed of microcrystal UV laser source module, light source driving control module, the sample pool, spectral detection module, displaying and processing module.Microcrystal UV laser source module is a quasi-monolithic, single-longitudinal-mode, single transverse mode, single polarization, all-solid-based, sub-nanosecond (pulse width less than 500ps), high repetition frequency (> 10kHz), high peak power (> 30kw) coherent light sources. It has a very small volume (1.4x1.4x1x1.60-2.00mm3), a wavelength of 355nm, 266nm and 213nm with very compact high-order harmonic laser systems; Light-driven control module can provide a stable temperature and power; Fluorescence detection module using CCD as a detector; Data analysis processing module conduct pre-processing and analysising to measure the fluorescence spectra images. According to fluorescent characteristic database, conduct semi-quantitative and qualitative analysis to the sample. Through the detection result of melamine and other compounds, demonstrate the feasibility of using UV laser-induced fluorescence spectroscopy technology to water analysis and test. This water analyzer has characteristics such as high sensitivity, high signal to noise ratio, portable and real-time.