折轴阶梯光栅光谱仪由南京天文仪器研制中心研制成功，它的使用说明请参阅赵刚研究员和李宏斌写的《The Coudé Echelle Spectrograph for the Xinglong 2.16-m Telescope》(PDF)

Abstract:

    A brief description of the NAO coudé echelle spectrograph mounted on the 2.16-m telescope at Xinglong station is given. This echelle spectrograph is located at the coud¨| focus with a prism cross disperser. The echelle image covers the spectral region from 330 to 1100 nm displayed in 80 spectral orders in one exposure through two light beams. With a slit height of 2 mm, spectral orders are separated by 15 to 23 pixels in blue region and by 7 to 19 pixels in red region. Alternatively, two additional resolution modes corresponding to different focal length cameras with resolving power R =16 000, 170 000 in the blue beam and R = 13 000, 170 000 in the red beam could be provided by this spectrograph. The bias, dark, wavelength calibration, flat field and science exposure are described in details. The limiting magnitude for 1 hour exposure with an S/N ratio of 100 scales to V = 9.5 in the red path and to V = 7.2 in the blue path.
Key words: instrumentation: spectrographs --- methods: observational --- techniques: spectroscopic