Torr M R, Torr D G
Appl Opt. 1995 Dec 1;34(34):7888-98. doi: 10.1364/AO.34.007888.
We report on the design of a small spectrograph that is capable of imaging several thousand angstrom simultaneously at a moderate spectral resolution. The prototype instrument included a number of developmental items that were used to assess their utility in this and other applications. Some we would recommend using again, some we would not. In the configuration that was built and tested, the instantaneous wavelength range was chosen to be 3700-11,700 Å. However, the wavelength range could be selected for a lower wavelength, as low as ~ 1200 Å. The spectral imaging was achieved with an intensified-CCD focal-plane detector. The broad wavelength coverage was achieved with a matrix of four diffraction gratings and a custom-designed photocathode system. The photocathode was specially built to provide a response over the chosen broad wavelength range by use of a single image intensifier. The theoretical spectral resolution of the instrument varied from 12 to 20 Å depending on waveleng th segment. A higher spectral resolution can be selected at the expense of total wavelength coverage. The optical system was designed to be moderately fast (f/6) when considered at the level of each of the four optical subchannels and suitable for use on relatively weak airglow signals. The instrument was designed to be readily portable, weighing 15 kg, with an envelope of 37 cm × 37 cm × 48 cm. The advantages and weaknesses of such an instrument are discussed, and improvements are suggested for specific applications. This study represents a stepping stone in the evolution of electronic spectrographs and leads to later designs that are currently being evaluated.
我们报告了一种小型光谱仪的设计，该光谱仪能够在中等光谱分辨率下同时对数千埃进行成像。原型仪器包含一些用于评估其在该应用及其他应用中的效用的研发项目。有些我们建议再次使用，有些则不建议。在已构建并测试的配置中，瞬时波长范围选择为3700 - 11,700 Å。然而，波长范围也可以选择更低波长，低至约1200 Å。光谱成像通过增强型电荷耦合器件（intensified - CCD）焦平面探测器实现。宽波长覆盖通过四个衍射光栅矩阵和定制设计的光电阴极系统实现。该光电阴极经过特殊制造，通过使用单个图像增强器在选定的宽波长范围内提供响应。仪器的理论光谱分辨率根据波长段在12至20 Å之间变化。可以以牺牲总波长覆盖范围为代价选择更高的光谱分辨率。从四个光学子通道各自的层面考虑，光学系统设计为中等速度（f/6），适用于相对较弱的气辉信号。该仪器设计为便于携带，重15千克，外形尺寸为37厘米×37厘米×48厘米。讨论了这种仪器的优缺点，并针对特定应用提出了改进建议。这项研究是电子光谱仪发展过程中的一块垫脚石，并促成了目前正在评估的后续设计。
