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利用积分球内照度的一般公式，导出了光纤端面接收角内的照度（有效照度）的计算公式，并给出了随接收角变化的相对照度值曲线及一个简洁的结论。
The formula of illuminance (effective illuminance) within the acceptance angle of the fiber end is deduced by using the general formula of illumination inside the integrating sphere. The relative illuminance value curve with the receiving angle and a concise conclusion are given.