漫射红外线背景辐射实验 (Diffuse Infrared Background Experiment，DIRBE)是NASA在宇宙背景探测者任务中测量天空漫射红外线的一项实验。DIRBE的仪器是绝对辐射计和一架口径19公分的折叠离轴格里望远镜。目标是在从近红外线到远红外线 (1.25至240微米) 的10个频率波段上观察宇宙的亮度地图。同时，也在1.25、 2.2 和 3.5 微米测量线性偏极化。在任务期间，这套仪器每天可以取得半个天球的样本。

Diffuse Infrared Background Experiment (DIRBE) was an experiment on NASA's COBE mission, to survey the diffuse infrared sky. Measurements were made with a reflecting telescope with 19 cm diameter aperture. The goal was to obtain brightness maps of the universe at ten frequency bands ranging from the near to far infrared (1.25 to 240 micrometer). Also, linear polarization was measured at 1.25, 2.2, and 3.5 micrometers. During the mission, the instrument could sample half the celestial sphere each day.