Garrett D L, Tousey R
Appl Opt. 1977 Apr 1;16(4):898-903. doi: 10.1364/AO.16.000898.
The objective of Skylab corollary experiment S020 was to obtain through the availability of long exposure times more complete information than was then available on the extreme ultraviolet (XUV) and soft x-ray spectrum of the sun in the 10-200-A range. The instrument was a small grazing incidence spectrograph with photographic recording. Use was made of a novel split-ruled grating that combined 1200- and 2400-1/mm rulings to double the spectral coverage of the instrument and to aid in the measurement of wavelengths and order sorting. As it happened, there were many difficulties resulting from the major problems encountered by the Apollo and Skylab missions. Useful spectra were obtained, but the sensitivity of the instrument was greatly reduced, probably because of contamination resulting from leakage of the fluid used in the spacecraft cooling system.
天空实验室配套实验S020的目标是，通过长时间曝光，获取比当时已有的关于太阳在10 - 200埃范围内的极紫外（XUV）和软X射线光谱更完整的信息。该仪器是一台带有照相记录功能的小型掠入射光谱仪。使用了一种新型的刻线分离光栅，它将每毫米1200条和2400条刻线组合在一起，使仪器的光谱覆盖范围加倍，并有助于波长测量和级次分选。碰巧的是，阿波罗和天空实验室任务遇到的重大问题导致了许多困难。虽然获得了有用的光谱，但仪器的灵敏度大大降低，这可能是由于航天器冷却系统中使用的流体泄漏造成的污染所致。
