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红外列阵摄像机(IRAC)是Spitzer空间望远镜中的三台焦平面仪器之一。这是一台四通道摄像机,能够同时在3．6μm、4．5μm、5．8μm和8．0μm波长处获取宽带图像。四个通道成对地(3．6μm和5．8μm为一对,另一对为4．5μm和8μm)观测焦平面中两个靠得很近的5．2′×5．2′的视场。摄像机中的四个探测器列阵的尺寸均为256×256元,两个较短波长的通道使用InSb探测器,而两个较长波长的通道则使用Si：As IBC探测器。由于红外列阵摄像机具有高灵敏度、宽视场和四色成像功能,因此是一台得力的观察仪器。本文简单介绍该仪器在飞行中的科学、技术和工作性能．
The Infrared Array Camera (IRAC) is one of three focal plane instruments in the Spitzer space telescope. This is a four-channel camera that takes broadband images simultaneously at 3.6μm, 4.5μm, 5.8μm and 8.0μm. The four channels are paired (3.6 μm and 5.8 μm are paired and the other pair is 4.5 μm and 8 μm) to view the two closely spaced 5.2 ’× 5.2’ views in the focal plane field. All four detector arrays in the camera are 256 × 256 elements in size, with two shorter wavelength channels using InSb detectors and two longer wavelength channels using Si: As IBC detectors. Because of its high sensitivity, wide field of view and four-color imaging capabilities, the infrared array camera is an effective observation instrument. This article gives a brief introduction of the science, technology and performance of this instrument in flight.