three-color photometry

例句：

1. 1. The three-color photometer wasused to measure the color temperature of thelight source.
   使用三色光度计测量光源的颜色温度。
2. 2. In tri-color photometry, each color is measured separately.
   在三色光度测量中，每种颜色分别测量。
3. 3. The tri-color photometerwas used to analyze the spectral characteristics ofthe light source.
   使用三色光度计分析光源的光谱特性。