定点高速闪光摄影技术在土工离心机中的应用

Fixed-spot High-speed Flash Photography Technique Applied to Geotechnical Centrifuge

在土工离心模型试验中,摄影是一种重要的测试手段,其具有非接触、直观、测试对象为整个压缩面而非点等优点,但如何拍摄高速旋转的土工离心模型完整、清晰图像一直是一个技术难点,通过定点高速闪光摄影技术较好地解决了这一问题。介绍了定点高速闪光摄影的原理,闪光时间、闪光能量的确定,定点高速闪光摄影同步控制以及实际应用的结果。

Photography is an important approach in geotechnical centrifuge model tests.It is intuitive,noncontact,and takes compression plane instead of points as the test object.It＇s a technical difficulty to get clear and complete photos of geotechnical centrifuge model while it＇s rotating with high speed.The authors introduced the principle of applying fixed-spot high-speed flash photography in geotechnical centrifuge.The determination of flash duration and power,the time-series synchronous control as well as the result of applying this photography system to geotechnical centrifuge were also presented.