为了提高光学衍射法细圆柱体直径测量精度，用递归法建立了更精确的改进模型。

To improve measurement accuracy of thin cylinder's diameter by optical diffraction, an improved model is established with recursive method, which is more accurate.

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运用改进模型测量细圆柱体直径时，克服了传统测量模型由衍射角引起的原理误差，提高了测量精度。

Theoretical error of customary model created by diffraction Angle is eliminated so that the measurement accuracy is improved when the diameter is measured with the improved model.

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运用改进模型测量细圆柱体直径时，克服了传统测量模型由衍射角引起的原理误差，提高了测量精度。

Theoretical error of customary model created by diffraction Angle is eliminated so that the measurement accuracy is improved when the diameter is measured with the improved model.

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