在时间调制傅里叶变换光谱仪中, 直线运动型动镜很难精确驱动, 容易引起倾斜和剪切的问题。 旋转型动镜可以解决该类问题。 介绍了一种转镜式傅里叶变换光谱仪方案, 并对其进行了原理分析和光程差公式推导, 提出了工程设计约束条件。 该光谱仪由一个分束器, 两个固定平面镜, 两面平行固定在一个转轴上旋转的平面反射镜, 前置镜, 后置镜及探测器组成。 通过原理介绍得出, 该光谱仪结构简单, 两条分光光线经同一平面镜反射后干涉, 使仪器更容易装调;通过光程差推算得出, 该光谱仪容易实现大光程差, 光谱分辨率高;通过工程设计约束及仿真分析得出, 该光谱仪需要在高速旋转的条件下实现高分辨率采样, 容易实现精确运动控制, 稳定性好, 测量速度快。

In the temporally-modulated Fourier transform spectroscopy, the translational moving mirror is difficult to drive accurately, causing tilt and shear problems. While, a rotational moving mirror can solve these problems. A rotary Fourier transform spectrometer is recommanded in this paper. Its principle is analyzed and the optical path difference is deduced. Also, the constrains for engineering realization are presented. This spectrometer consists of one beamsplitter, two fixed mirrors, one rotating parallel mirror pair, a collimating lens, a collecting lens, and one detector. From it’s principle, this spectrometer show a simple structure, and it is assembled and adjustmented easily because the two split light are interfered with each other after reflected through the same plane mirror; By calculating the expression of it’s optical path difference, the spectrometer is easy to realize large optical path difference, meaning high spectral resolution; Through analyzing it’s engineering design constraints and computer simulation, it is known that the spectrometer should get the high resolution sample by high-speed spinning motor, so it is easy to achieve precise motion control, good stability, fast measurement speed.