An AF-1 Fourier spectrometer is developed on the basis of a two-beam interferometer with a pendulum-type scanning unit, which is manufactured of a special alloy ensuring its time stability, and a stationary block of plane reflectors made of a highly stable glass. The performance characteristics of the instrument are as follows: the IR spectrum region is 400-4000 cm{sup}(-1); the highest resolution is 1 cm{sup}(-1); the accuracy of determining wave numbers is ±0.1 cm{sup}(-1); the optical-density measurement range is 0.05-3 units; the variations of the deviation from the 100% transmission level in the entire spectral region are within ±0.5%; the rms deviation of the optical density in the range of 0.2-2.0 units is ～1%; and the signal-to-noise ratio in the range of 2000-2100 cm{sup}(-1) is at least 10{sup}4 for a measurement time of 2 mm and a spectral resolution of 1 cm{sup}(-1).
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机译：AF-1傅里叶光谱仪是在带有摆式扫描单元的两光束干涉仪的基础上开发的，该摆锤式扫描单元由确保时间稳定性的特殊合金制成，并由高度稳定的玻璃制成的固定平面反射镜。该仪器的性能特征如下：红外光谱范围为400-4000 cm {sup}（-1）;最高分辨率为1 cm {sup}（-1）;确定波数的精度为±0.1 cm {sup}（-1）;光密度测量范围为0.05-3个单位;在整个光谱范围内与100％透射水平的偏差变化在±0.5％以内;在0.2-2.0单位范围内，光密度的均方根偏差为〜1％;并且在2mm的测量时间和1cm {sup}（-）的光谱分辨率下，在2000-2100 cm {sup}（-1）范围内的信噪比至少为10 {sup} 4。 1）。
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