目前,在机械性能试验中,对引伸仪之所以迫切需要,是由于:1.随着机械工业的发展,对于在不同场合下测定材料变形的需要加强了。但就现有的各类引伸仪来看,在使用上都存在着一定的局限性。就拿光学镜式引伸仪来说,它的精度很高,但是,使用过程中很费时,且装卸调试都很麻烦,这对于很多工厂试验室是不能满足 At present, in the mechanical properties test, the reason why the extensometer is urgently needed is due to: 1. With the development of the machinery industry, the need of measuring the material deformation in different occasions has been strengthened. However, in view of the existing types of extensometers, there are some limitations in their use. Take the optical microscope extensometer, its high accuracy, but the use of time-consuming, and loading and unloading debugging are very troublesome, which for many factory laboratories can not meet