They chose the correct photograph by breaking an infrared beam near the flat surface showing the photo.
它们可以通过感应屏幕上显示的红外光束来选择名人的照片。
Infrared beam
原声例句
VOA Special 2017年11月合集
华尔街日报
We have a transmitter, which is like an inner solar that delivers an invisible infrared beam and the receiver converts the infrared beam back into electricity.
我们有一个发射器，它就像一个内部的太阳能，它发出不可见的红外光束，接收器将红外光束转换回电能。
英语百科
Light beam
![A Symphony of Lights in Victoria Harbour, Hong Kong[1]](/Images/godic/202501/20/Hk-Symphony_of_Lights_34202141.jpg")
![Light beams were used to symbolize the missing towers of the World Trade Center as part of the Tribute in Light.](/Images/godic/202501/20/Wtc-2004-memorial2141.jpg")
![A natural lightbeam in the Majlis al-Jinn (literally 'Meeting place of the jinn') cave in Oman](/Images/godic/202501/20/Descending_into_cave2141.jpg")
![Beams shining through water-based haze in a photo studio setting.](/Images/godic/202501/20/Haze-beams2142.jpg")
A light beam or beam of light is a directional projection of light energy radiating from a light source. Sunlight forms a light beam (a sunbeam) when filtered through media such as clouds, foliage, or windows. To artificially produce a light beam, a lamp and a parabolic reflector is used in many lighting devices such as spotlights, car headlights, PAR Cans and LED housings. Light from certain types of laser has the smallest possible beam divergence.
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