Abstract: We review design considerations and present preliminary details of the performance of a new imaging system for hard X-ray astronomy in the 20 - 600 keV energy range. The detector is a 40 cm $MUL 40 cm NaI(Tl)/CsI(Na) phoswich module, read out by a 7 $MUL 7 array of square PMTs. The detector comprises the main part of the next generation Energetic X-ray Imaging Telescope Experiment (EXITE2), which had its first flight on 13 June 1993 from Palestine, Texas. Imaging is accomplished via the coded- aperture mask technique. The mask consists of 16 mm square lead/tin/copper pixels arranged in a cyclically repeated 13 $MUL 11 uniformly redundant array pattern at a focal length of 2.5 m, giving 22 arcmin resolution. The field of view, determined by the lead/brass collimator (16 mm pitch) is 4.65 degrees FWHM. We anticipate a 3 sigma sensitivity of 1 $MUL 10$+$MIN@5$/ photons cm$+$MIN@2$/ s$+$MIN@1$/ keV$+$MIN@1$/ at 100 keV in a 10$+4$/ sec balloon observation. The electronics incorporate two on-board computers, providing a future capability to record the full data stream and telemeter compressed data. The design of the current detector and electronics allows an upgrade to EXITE3, which adds a proportional counter front-end to achieve lower background and better spatial and spectral resolution below approximately 100 keV.!14
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机译：摘要：我们审查了设计注意事项，并提出了一种新的用于硬X射线天文学的成像系统在20-600 keV能量范围内的性能的初步细节。该检测器是一个40 cm $ MUL 40 cm NaI（Tl）/ CsI（Na）荧光模块，由7个$ MUL 7个方形PMT阵列读出。该探测器包括下一代高能X射线成像望远镜实验（EXITE2）的主要部分，该实验于1993年6月13日从得克萨斯州巴勒斯坦首次飞行。成像是通过编码孔径光罩技术完成的。掩模由16毫米见方的铅/锡/铜像素组成，这些像素以2.5 m的焦距以循环重复的13 $ MUL 11均匀冗余阵列图案排列，从而获得22 arcmin分辨率。由铅/黄铜准直仪（16毫米间距）确定的视场为FWHM 4.65度。我们预计3 sigma灵敏度为1 $ MUL 10 $ + $ MIN @ 5 $ /光子cm $ + $ MIN @ 2 $ / s $ + $ MIN @ 1 $ / keV $ + $ MIN @ 1 $ /以每秒10 $ + 4 $的热气球观察速度。电子设备包含两台车载计算机，为将来记录全部数据流和遥测仪压缩数据提供了能力。电流检测器和电子设备的设计允许升级到EXITE3，它增加了比例计数器前端，以实现较低的背景以及低于约100 keV的更好的空间和光谱分辨率！14
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