This paper introduces the application of direct digital synthesizers (DDS) technique in laser phase distance measurement.

本文介绍了直接数字合成（DDS）技术在激光相位测距仪中的应用。

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The authors introduced the methods and advance of grain size analysis technique, including direct measurement, sieving analysis, setting method and the laser grain-size analyzer;

本文主要介绍粒径测试技术方法及其新进展，包括传统的直接测量法、筛析法、沉降法和以计算机为依托的激光粒度测试仪法；

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