衍射仪光阑配置及试样设置偏差对应力测量精度的影响

Effects of Slits Arrangement and Sample Setting Error on the Precision of X-Ray Stress Measurements

针对Rigaku公司的Dmax系列X射线衍射仪,研究了准聚焦光学系统下,DS/RS/SS光阑配制及试样设置偏差对常规法应力测量精度的影响。确定了优化的光阑配置参数,并排除光阑的作用对试样设置偏差的影响作了正确评价。

An Ω-goniometer Las been widely used on X-ray diffractometer tomeasure the stresses in polycrystalline materials.In this paper,the possible systematic errors due to casual arrangements of divergent slit,received slit and anti-scatter slit are evaluated with a standard stress-free sample.It is found that for the obtained stress value the application of divergent slit with large width will introduce negtive or positive errors in or measurements.This effect can hardly he eliminated by averaging those two stress values.Contrary to divergent slit,the received slit has nearly no influence on a relative displacement of diffraction profile.For stress measurement with stationary slits,the effect of sample setting error is often emphasized,but the experimental results in this paper indicates that the limit setting error may be neglected if the slit effect is excluded beforehand by a standard stress-free sample,