【摘要】 根据光谱导数原理,设计了波长光强分束器,它能对光束实现光强和波长的空间分离,获得满足一阶光谱导数条件的两束光。开发了一种双光束双波长导数光谱技术,在物理上实现了光谱求导。使用波长光强分束器获得两束满足一阶光谱导数条件的光束,互补调制该两束光到同一个光电探测器进行差分,探测器输出差分信号到计算机进行处理,扫描波长从而获得光谱的一阶导数。实验验证了系统的可行性,并测出氙灯发射谱的导数光谱,发现其分辨率和光谱的精细结构都比其发射谱好。更多还原

【Abstract】 The derivative spectrum technique has been widely applied to spectral analysis due to its high resolution and sensitivity. A new kind of derivative spectrum technique is presented in this paper. In order to realize derivative spectrum, a wavelength-intensity splitter has been designed to obtain two light beams with slim difference in wavelength. The two light beams were complementarily modulated with an optical complementary chopper. The modulated light beams were focalized to a photoelectric detector and realized intensity difference. By scanning the wavelength, the derivative spectrum was obtained. The derivative spectrum signal from the detector was acquired and recorded by a computer. Through a lot of experiments, the rationality of the system was approved. The emission spectrum and its first derivative spectrum of the xenon lamp were measured on this system. Finally, the result shows that the first derivative spectrum sensitivity and resolution are both higher than that of the emission spectrum.更多还原