根据残留农药受到紫外光激发能够发出荧光的机理,研究了一种用于测量残留农药浓度的荧光光纤测量系统.该系统采用脉冲氙灯作为激发光源,光纤探测并传输荧光,电荷耦合器(CCD)作为荧光检测系统的光电转换器件.由于荧光是微弱信号,系统采用微弱信号处理电路对CCD输出信号进行了处理,并且采用相关双采样技术有效地抑制了CCD输出噪声的干扰.用该系统对吡虫啉溶液进行荧光分析,实现了对吡虫啉的快速测定,在5～100μg/L范围内,荧光强度和浓度基本呈线性关系,线性相关系数为0.9959.
Abstract：
Based on the mechanism that pesticide can emit fluorescence in the ultraviolet light, a fluorescence fiber- optical measuring system is developed for monitoring its concentration. This system makes use of pulse xenon lamp as exciting light source, the optical fiber detects and transmits the fluorescence, charge coupled device (CCD) is used to photo-electricity transformation component of fluorescence measuring system. Because fluorescence is a weak signal, the system uses the weak signal processing circuit to carry on processing to the CCD output signal and uses the correlated double sample technique to control the disturbance Of CCD output noise effectively. Carting on the fluorescence analysis with this system to the imidaeloprid, the imidacloprid fast determination was realized. In the scope of 5～100 μg/L, the fluorescence intensity and the density assume the linear relations, the linear correlation coefficient is basically 0. 9959.
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