研制了一款模块化便携式的激光诱导荧光的检测仪。本检测仪以光纤耦合的稳谱405 nm LD激光器作为激发光源, 以改进的共聚焦光学结构的荧光探头作为荧光的收集模块, 微型光栅光谱仪作为荧光光谱分析模块。该检测仪采用模块化结构, 具有体积小、成本低、灵敏度高 、易操作等特点。 以荧光素钠为测试样品, 对仪器进行了评估。水的拉曼S/N值为935.67, 检测仪的最低检出限为1.9×10-11 g/L; 溶液浓度在10-10到10-12 g/L的范围内, 荧光强度的线性相关系数达到0.999 8, 线性范围超过3个数量级; 重复性测试中, 荧光峰值强度的相对标准偏差为RSD=3.36%, 荧光波长相对标准偏差RSD=0.14%。结果表明该检测仪具有灵敏度高、重复性好、线性范围宽等特点, 满足现场物品的实时快速检测需求。

A portable laser-induced fluorescence detector based on module design, which includes an excitation source of 405 nm fibre-coupled stable spectra diode laser, a fluorescence collection module based on a fibre fluorescence optical f probe with a improved confocal optical path, a fluorescence analysis module of Mini Fiber Grating Spectrometer. The advantages of the detector is compact, small size, low cost, high sensitivity, easy to operate.The performance of the detector was evaluated by Fluorescein Sodium . Water raman peak measurement S/N is 935.67.The detection limit of Fluorescein Sodium was 1.9×10-11 g/L. Correlation of the fluorescence intensity was 0.999 8 with the concentration from 10-10 to 10-12 g/L, the linear dynamic range was over 3 order. RSD of the fluorescence wavelength and intensity reproducibility was 0.14%and 3.36% respectively.It was concluded that the 405 nm LIFD had highly sensitivity, good reproducibility, a wide linear range.