Effective surface layer stress was introduced by birefringence of the fundamental mode, and corresponding apparatus of measurement was fabricated.

通过基模的双折射引入有效表层应力，并制作出相应的测量装置。

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In this paper, the birefringence method and its practical USES for measurement of orientation degrees of Polyethylene monofilaments have been investigated.

本文研究了双折射法测定聚乙烯挤出单丝取向度的方法与实际应用。

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