在静态干涉系统中, 采用电光调制可变折射率晶体LiNbO3做静态傅里叶干涉具的材料, 两侧分别加载相位相反的调制信号, 从而在不改变静态傅里叶干涉具尺寸的条件下提高光谱分辨率。 通过推导光程差函数与折射率调制度的函数关系, 计算得在折射率调制度为0.030的条件下, 比同尺寸干涉具光谱分辨率提高了16.7倍, 达到2.836 cm-1。 仿真结果表明折射率调制度会因波长增大而减小, 光程差函数会随干涉位置的增大而产生偏大的现象。实际探测过程中, 由于光谱范围500～1 100 nm相对较窄, 波长变化造成的光谱探测失真不大, 可以通过标定补偿, 所以应用该方法可以有效地提高静态干涉系统的光谱分辨率。Fourier Transform Spectrometer

In the static interferometer system, the variable refractive crystalLiNbO3 with electro-optic modulation was used in static Fourier transforminterferometer, where both sides load phase opposite modulation signal separatelyso to raise the spectrum resolution in the same size of the instrument by theincrement of optical path difference. According to the derivation of the opticalpath difference function with refraction modulation, the maximum optical pathdifference was calculated and the spectrum resolution was analyzed to be 16.7times previous one when the refraction modulation was 0.030 in the same size ofinterferometer. The simulation result indicated that the refractive modulationwould be reduced when the wavelength increased, and the value of optical pathdifference will be bigger when the x′ increased. In actual detection process,because spectral region 500-1 100 nm is relatively narrow, the spectrumdistortion by the wavelength change is not big and may be compensated through thedemarcation. This method can increase the optical path difference withoutmechanical scanning, and possibly raises spectrum resolution of the staticinterferometer.-optic modulation; Spectrum resolution