光学仪器上的一个可调开口，如照相机或望远镜，它控制穿过镜头的或到镜面的光的数量。
A usually adjustable opening in an optical instrument, such as a camera or a telescope, that limits the amount of light passing through a lens or onto a mirror.
本文介绍我们在1980年完成的500K可调黑体炉，它主要用于红外望远镜和红外探测系统定标。
The paper describes the blackbody with adjustable temperature at about 500K, which was made in 1980. It is used for the calibration of the IR telescope and IR detection system.
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