Repetition and Statistical Errors Calculation for Short Wavelength X-Ray Stress Measurement
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摘要: 采用XL-1型短波长应力分析仪对铝板同一位置的Al(111)晶面衍射峰进行了8次测试，再分别采用交相关法和抛物线法定峰，确定了测试衍射峰的位置、积分强度及半高宽等参数，计算了它们8次测试重复性的相对偏差，并基于通常的sin2ψ应力测试技术，评估了两种定峰方法对铝板应力测试的统计误差。结果表明:采用交相关法和抛物线法定峰时，Al(111)晶面衍射峰位测试重复性的相对偏差分别只有0.144‰和1.27‰，衍射峰积分强度和半高宽测试重复性的相对偏差分别为5.38%和5.56%;采用交相关法和抛物线法定峰进行应力测试的统计误差分别为7.56 MPa和6.64 MPa，该误差值处在常规X射线应力测试允许的误差范围内。Abstract: The diffraction peak of Al(111) plane in an aluminum sample was measured repeatedly for 8 times at a fixed point by using an XL-1 type short wavelength stress analyzer, and then peak locations, integral intensity and full width of half maximum intensity(FWHM) were determined by using cross correlation method and parabola method, and relative deviations of repeated measurement for 8 times were calculated. The stress statistical errors for aluminum plate were also evaluated according to sin2ψ stress measuring technique. The results show the relative deviations of measuring repeatability for Al(111) plane peak locations determined by cross correlation method and parabola method were 0.144‰ and 1.27‰, and that of measuring repeatability for integral intensity and FWHM were 5.38% and 5.56%, respectively. The stress statistical errors were 7.56 MPa and 6.64 MPa from cross correlation method and parabola method, and the errors in the error range permitted by a conventional X-ray stress measurement.
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Keywords:
- X-ray stress measurement /
- inner stress /
- short wavelength
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