According to the practical requirement, a tubing length measuring device is developed.

根据油田井下作业的实际需要, 研制了一种油管长度在线连续测量仪.

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It enables to produce various kinds of precision mechanical, electronic digital protractor and length measuring tools.

能生产各种精密的机械类和数显类角度量具, 长度量具等.

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The principle of Laser Interferometer and its formula for length measuring are discussed in this paper.

分析了激光干涉系统的原理,给出了长度测量的计算公式.

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