中性度是表征中性密度滤光片中性程度的一项重要指标,为了对中性度进行评价,通过分析和总结现有工程中的一些关于中性程度的表述,并结合密度滤光片的测试光谱曲线,总结出了光密度曲线的归一化比较方法。为进一步对中性度进行量化,提出了标准中性度的定义,并给出了中性度的具体算法。该算法简单、易行、直观,便于实施推广。经过该方法量化后的中性度指标不仅可用于标注标准密度滤光片产品的中性程度,也可用于非标产品中性程度评价和约束。

Neutrality is an important specification to judge the neutral degree for neutral density filters. Various descriptions of neutrality on its applications in current engineerings are analyzed and concluded to evaluate the neutrality. And normalization processing of spectral curve is summed up by analyzing the spectral characteristics of ND filters. The definition of the standard neutrality is given to quantify the neutral characteristics, and an algorithm, which is simple, intuitive and easy to implement and spread, is also produced. The quantized neutral characteristic can be used both in calibrating the standard ND filters and nonstandard products.