这些传感器很容易调准，且使用非常明亮的红色发光二极管来安装。
These sensors are easily aligned and installed using the extremely bright red sender led.
为了分析准单色光照射轴锥镜的衍射特性，用红色高亮发光二极管作为准单色光源。
A red highlight LED was used as quasi-monochromatic light source for analyzing the diffraction property of an axicon in quasi-monochromatic light.
为了分析准单色光照射轴锥镜的衍射特性，用红色高亮发光二极管作为准单色光源。
A red highlight LED was used as quasi-monochromatic light source for analyzing the diffraction property of an axicon in quasi-monochromatic light.
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