斜光束对校正滤光片匹配准确度的影响

光电积分式的测色仪器中,光探测器的响应必须满足卢瑟条件.这一般是通过精确的匹配校正滤光片来实现的,匹配的准确度与入射光束在校正滤光片中的实际光程有关.由于测量条件的影响,入射光束不可避免地包含各个方向的入射光线,斜光束的存在会使理论计算出的匹配准确度降低.本文采用总误差面积比例最小法来评价校正滤光片的匹配准确度,阐述了校正滤光片匹配的理论依据,验证了斜光束光谱透射对于整个校正滤光片匹配准确度的影响,并提出了考虑到斜光束影响的校正滤光片厚度的修正公式.以"Y"滤光片的匹配为例,证明了修正后的公式对提高匹配准确度的意义.

Influence of Oblique Beams on Matching Accuracy of Correcting Filter

Color measurement instruments designed by principle of photoelectric integral,response of photo detector must meet Luther condition, which is realized by matching of correcting filters, and the matching accuracy is relevant to the actual light path in correcting filter. With the impact of measurement condition, the incident light inevitably contains various directions, and the exist of oblique beams reduces matching accuracy by theoretical calculation. The accuracy of matching filter is evaluated using the smallest proportion of total error area, the theoretical basis for correcting filter matching is introduced, the influence of oblique beams to correcting filter's matching accuracy is proved, and the corrected formula of thickness of correcting filter is proposed when taking oblique beams into account. Take the matching of "Y" correcting filter as an example, the significant of corrected formula to matching accuracy is proved.