Using this method can not only be convenient to measurement of roving stretch rate, but also shorten the testing spinning cycle of the roving.

用这种方法不仅能使粗纱伸长率的测量变得十分方便，而且还可使粗纱的试纺周期大大缩短。

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The differences of principle and precision between frequency measurement method, cycle measure method, and equivalent precision frequency measurement method are compared.

分析、比较了测频率法、测周期法、等精度测频法等几种常用测频方法的原理及误差。

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The method is qualified for measurement of groove depth and duty cycle simultaneously for the rectangle-shaped or similar profile of holographic grating mask.

对于要求同时检测矩形或接近矩形槽形的全息光刻胶光栅掩模的槽深和占宽比，该方法完全适用。

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