结合微型光谱仪体积小、测量速度快的特点和双光路光谱仪的光束结构，基于双芯光纤和面阵探测器Czerny-Turner光学结构设计并研制成功一种微型双光束光谱检测系统——一双光束微型光谱仪.系统中第一根双芯光纤将光源光强均分成两路，一路作为参考光路，另一路作为检测样品的样品光路.参考光和被测样品光通过第二根双芯光纤传输并同时照明微型光谱仪的入射狭缝，两个纤芯沿狭缝长度(非色散)方向排列.为保证两路光的成像光谱不会发生重叠和串扰，在交叉对称Czerny-Turner光学结构中加入消像散柱面镜元件，运用光学设计软件对光谱仪系统进行了优化设计.光线追迹结果显示，双芯光纤传输参考光路与被测样品光路光束的成像光谱可以在300～800 nm范围内分离.依据设计结果加工并装调成功双光束微型光谱仪系统实验样机，实现了参考光谱和被测样品光谱在光谱仪上的同时显示与测量.实验表明，所设计的双光束光谱仪不仅具有双光路的光束结构，而且充分利用微型光纤光谱仪接口及配置灵活的特点，实现了真正意义上具有双光束光路结构的微型光谱仪系统.

A novel miniature double-beam spectrum measurement system called double-beam miniature spectrometer is proposed based on twin-core fiber and 2-D CCD detector Czerny-Turner spectrometer. The advantage of the miniature spectrometer with small size and fast measurement and the superiority of the double-path spectrophotometer with double light paths are both presented. In this system, the light intensity of the light source is divided equally into two parts by the first two-core fiber. One part is considered as the reference light path, and the other is considered as the sample light path. Then the reference light and the sample light are transferred to the slit of the spectrometer by the second two-core fiber. The two cores of the second two-core fiber are distributed along the direction of the length of the slit (the direction of the non-dispersion). In order to avoid the overlapping and the crosstalk between the sample spectrum and the reference spectrum, astigmatism corrected cylindrical lens is added into the symmetrical crossed Czerny-Turner optical bench. The optical design software is used to optimize the system aberration. The ray tracing result shows that the imaging spectra of the reference path and the sample path can be clearly distinguished in the wavelength range of 300~800 nm. Eventually, the experimental prototype of the double-beam miniature spectrometer is manufactured and aligned. The sample spectrum and the reference spectrum can be displayed and measured simultaneously with the system. The design method of the double-beam miniature spectrometer is verified by the experiment. The light path of double beam, the characteristic of fiber connector and flexible configuration are realized in the double-beam miniature spectrometer.