点光源消失法检测航空有机玻璃光学畸变实验方法研究

Study on Measuring Optical Distortion of Aircraft Acrylic Sheets by Point Source Vanishing

按点光源消失法目前规定的操作方法检测航空有机玻璃光学畸变消失角时,离板材中轴线较远位置处的光学畸变在靠近幕布与远离幕布两位置所测的数据相差较大,影响到产品合格与否的判定。此现象的形成与缺陷距板材中轴线的距离和缺陷的截面形状等因素有关。解决问题的方法:在现有的检测置物架上加装可水平滑动的装置,检测时水平移动板材使所测光学畸变移至置物架旋转轴附近再旋转板材,分别读取各位置消失角数据后,取最大值。

When the optical distortion vanishing angles of aircraft acrylic sheets were measured by the point source vanishing method according to the present stipulation operating procedures, the optical distortions in the further distance from the central axis line of aircraft acrylic sheet were measured in the positions that were both close to and away from the stripe curtain. As a result, the acquired measure data are quite different and it has seriously effect on the inspectors to judge whether the measure sheet is qualified or not. In fact, the phenomenon is in connection with such factors as the defect distance from the central axis of the sheet and the defect cross section shape. A solution method is found out that a horizontal sliding device is installed on the existing rotation measure rack. Thus, the measure sheet can be horizontally slid close to the rotation axis of the rack and rotated, then the vanishing angles in the different positions are got respectively and the maximum angle value is taken as the measurement result.