DIN EN 2155-7-1997 航空航天系列.飞行器上窗玻璃用透明材料的试验方法.第7部分:光偏移的测定
Aerospace series - Test methods for transparent materials for aircraft glazing - Part 7: Determination of optical deviation; German version EN 2155-7:1997
The document specifies the method used for the determination of optical deviation caused to be a beam of light passing through a transparent element material perpendicular to the optical axis of the system.