secular stability meaning in English

长期稳定度
长期稳定性

As a result , just a set of imaging optical components , which used to merely complete alignment , now can be used for the three procedures ? die leveling , auto - focus , alignment . secondly , two vision - based optical systems for alignment are put forward . not only can high - resolution and high - quality images be gotten , but also straightforward hardware setup and good secular stability in the shop can be obtained
对本文所提出的光路结构方案中的成像镜组在光学自动设计软件zemax中进行了仿真和优化,成像镜组与所采用的高分辨率ccd相机和不同频率范围的led光源获得了很好的匹配,并在不同频带和视场获得了很好的像差平衡。