Based on visual radiation image processing, a set of online combustion detection system in CFB boilers was designed in this paper, including the measurement of flame temperature and emissivity.

本课题的主要目的在于建立一种基于可见光辐射图像处理技术的流化床燃烧在线检测系统，通过该系统可实时检测床内火焰温度和黑度信息。

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By the way, the illustration below is a handy visual aid in understanding the differing dangers associated with sources of radiation.

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When we talk about telescopes, we're usually referring to devices that "see" the visual spectrum of light, but astronomers also build telescopes that gather radiation like radio waves and X rays in order to peer deep into outer space.

FORBES: No. 17: The Telescope