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Ames研究中心正研制一种新的长波红外测试装置,用以测试红外天文卫星(IRAS)望远镜的焦平面性能。此装置可在模拟的航天条件下,在背景电平低达8×10~6光子/厘米~2·秒的情况下,检验5～120微米波段的实际阵列。绝大多数的测试在主测试舱进行,主测试舱包括液氦冷屏、黑体源、黄道带背景的模拟装置和光点扫描光学装置。使用无污染高真空泵系统在降温前抽空测试舱,以防止分子沉淀。所有的辅助和焦平面输出信号经多路传输和数字转换后,通过高速数据传输线传送到PDP-11/70型计算机上。该计算机在终端彩色阴极射线管上作实时显象,同时贮存数据用于以后的数据整理和硬考贝输出。本文论述此测试装置的初步设计和性能规格。
Ames Research Center is developing a new long-wave infrared test set to test the focal plane performance of the Infrared Astronomy Satellite (IRAS) telescope. The device verifies the actual array in the 5-120 micron band under simulated space conditions at background levels as low as 8 × 10-6 photons / cm-2 · sec. The vast majority of tests are conducted in the main test chamber which includes liquid helium cold screens, blackbody sources, simulations of the zodiac background, and spot-scanning optics. Use an uncontaminated high vacuum pump system to evacuate the test chamber before cooling to prevent molecular settling. All auxiliary and focal plane output signals are multiplexed and digitally converted to a PDP-11/70 computer over a high-speed data transmission line. The computer in the terminal color cathode ray tube for real-time imaging, while storing data for future data collation and hard test output. This article discusses the preliminary design and performance specifications for this test setup.