Relative Diffuse Reflectance Measurement

相對擴散反射量測

由於光無法穿透不透明 (固態) 樣品，因此會在樣品的表面上反射。如圖中所示，相對於法線對稱反射的入射光稱為「鏡面反射」，而在不同方向散射的入射光稱為「擴散反射」。

Measurement of Diffuse Reflection Not Including Specular Reflection Using an Integrating Sphere

Measurement of Diffuse Reflection Including Specular Reflection Using an Integrating Sphere

使用積分球時，可透過將樣品放在入射光窗口前方，並使用具有硫酸鋇內側塗層的球體，將從樣品反射的光集中在偵測器上以進行量測。取得的數值會成為相對參考標準白板之反射率的反射率 (相對反射率)。
光以 0° 射向樣品時，鏡面反射光會離開積分球且無法偵測到。因此只會量測到擴散反射光。可取得具有不同入射角的積分球型號，以在上述情況下量測鏡面和擴散光。

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