The two laser beam system has been used to measure the relative density of linen dust, with the feature of wide measurement range, good sensitivity and restraining the intensity fluctuation noise.
本文采用双光路激光系统，对亚麻尘的相对浓度进行了连续测量，具有测量范围宽、 灵敏度好、 抑制激光强度起伏噪声等特点。
Power electronics broad application in power systems brings serious harmonic pollution. This paper introduces harmonic harm, the measure of restraining harmonic and the basic principle of filter.
电力电子装置的广泛应用，给电力系统造成了一定的谐波污染，文中简要论述谐波的危害、谐波的治理措施及无源滤波器和有源滤波器的基本原理。
The same time, we measure the shelter effect and restraining effect of wind-break net.
同时，对防风网防风、抑尘效果进行现场实测。
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