超高速光学扫描测量方法的准确度验证实验

Accuracy verification experiment of ultra-high speed optical scanning measurement method

为验证超高速扫描相机在动态条件下的测量准确度,采用具有较强代表性的扫描测量法获取TNT标准物质的爆速,并对测量的不确定度进行系统分析。结果表明:底片图像放大比的不确定度对爆速测量不确定度的影响最大,而标尺长度越小则图像放大比的不确定度将显著增加,因此,在实验过程中应尽可能地选择较长且图像较清晰的标尺;光学扫描测量法确定出TNT标准物质的爆速平均值为6.824 mm/μs,处于该标准物质的有效范围内,且标准差为0.015 mm/μs,可以反映出超高速光学扫描测量方法具有较高的准确度及较好的重复性。

In order to verify the measurement accuracy of ultra-high-speed scanning camera under dynamic conditions,the explosion velocity of TNT reference material was obtained by a representative explosion velocity scanning method,and the uncertainty of measurement was analyzed systematically.The results show that the uncertainty of image magnification ratio has the greatest influence on the measurement uncertainty of detonation velocity,and the smaller the length of scale,the greater the uncertainty of image magnification ratio.Therefore,in the process of experiment,we should choose as long as possible and the image is clearer.The average detonation velocity of TNT reference material was determined by optical scanning velocimetry to be 6.824 mm/μs,which was within the effective range of the reference material.And the standard deviation is 0.015 mm/μs,which can reflect that the ultra-high speed optical scanning measurement method has high accuracy and good repeatability.