复合材料在热真空下的尺寸稳定性测试方法

航天光学遥感器在轨运行时的环境与地面装调时有很大差异,对于采用复合材料的遥感器而言,在轨运行时由于材料受湿气解析的影响其几何尺寸将发生变化,进而影响遥感器的成像质量.因此,模拟在轨环境下复合材料几何尺寸稳定性测试,分析其在轨条件下的几何尺寸变形是十分必要的.提出了一种在热真空环境下,采用激光双频干涉原理对复合材料几何尺寸变形量的高精度测试方法,对该方法进行了方案验证与精度分析.针对采用碳纤维蒙皮/铝蜂窝夹层结构复合材料的某相机前镜筒进行了实际的热真空环境下几何尺寸变形量测试.结果表明,试验数据与理论数值在数量级上相同,提出的测试方案可行,为复合材料模拟在轨环境下几何尺寸变形量提供了一种测试手段.

Dimensional stability testing method of composite materials in thermal vacuum environment

The in-orbit environment for space remote sensor is much more different from that in the ground; the deformation of the composite materials which is affected by the moisture desorption will result in the imaging quality of space remote sensor. The methods of measurement for the dimensional stability of the composite materials must be studied specially. A method which was using the principle of laser interference for measuring the deformation of the composite materials when subjected to the in-orbit thermal-vacuum environmental conditions was proposed. The method was verified and the precision was analyzed. It indicates that the method has higher precision than others. A experience which was based on the carbon fiber/aluminous honeycomb core composite materials was done to analyze the dimensional stability of the composite materials. The results show that the experimental data and theoretical data are the same in order of magnitude. The method is feasible and can be used in testing the dimensional stability of composite materials.