静态焦散线仪及其光路分析

An Inexpensive Static Caustics Set with Optimum Optical Set-Up

利用自制的静态焦散线记录仪获得清晰的焦散线图象,对仪器的各种光路布置进行了分析,从而得出会聚光路为最佳实验光路,通过该光路布置可以获得最准确的焦散线图象.

Cranz-Schardin 24 spark camera has been widely used in measuring crack-tip stress fields of both transparent and opaque materials.It is suitable for both static and dynamic caustics experiments for measuring crack-tip stress field but is too expensive for a developing country. In this paper is presented an inexpensive static caustic set that gives caustic curve as clear,sharp,and bright as can be obtained with Cranz-Schardin 24 spark camera. In the design of this inexpensive static caustics set,several arrangements of optical set-up are com- pared,and the“convergent”arrangement is chosen as the optimum.This“convergent”arrangement al- lows the caustic image to be as clear and the experimental result to be as good as can be obtained with Cranz-Schardin 24 spark camera. This simple and inexpensive static caustics set can also be used for low-cyle alternating loads.