采用超声波方法对不同拉伸倍率的硬聚氯乙烯（PVC-U）样品垂直于其拉伸方向进行测试得到超声波速度,并通过红外二向色性的方法测试样品得到红外二向色性比。利用红外二向色性比对超声波速度进行标定,进而得到红外二向色性比与超声波速度的关系。经过测试表明,超声波速度与红外二向色性比可建立起关系,并且随着拉伸倍率的提高,样品的超声波速度逐渐减小,红外二向色性比逐渐增大。最终使得利用超声波方法进行在线取向度检测成为可能。
Ultrasonic has been used for measuring the sample with different ratio of stretching from the perpendicular direction of the stretching,and the velocity of ultrasonic was received.Dichroic ratio was given by microscopic infrared spectrum. Velocity of ultrasonic marked by the dichroic ratio,as follow the relationship between velocity of ultrasonic and dichroic ratio was founded.The result shows the increase of the stretching ratio reduces velocity of ultrasonic,and the dichroic ratio gradually ascends.Finally the possibility of measuring the orientation of the pipe by ultrasonic in-line could be realized.
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