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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。
According to the principle of spectral derivative, a wavelength beam splitter is designed, which can separate the intensity and wavelength of the beam and obtain two beams satisfying the first-order spectral derivatives. A dual-beam dual-wavelength derivative spectroscopy technique has been developed to achieve spectral derivation physically. Two beams of light that satisfy the first-order spectral derivative conditions are obtained using a wavelength optical beam splitter, the two beams of light are complementarily modulated to the same photodetector for differential, the detector outputs a differential signal to a computer for processing, the wavelength is scanned to obtain a spectrum of First Derivative. The feasibility of the system was verified experimentally, and the derivative spectrum of the xenon lamp emission spectrum was measured. It was found that the resolution and the fine structure of the spectrum were better than those of the emission spectrum.