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分析了LXJ－40离心机光栅测速系统的特点，并从测速信号质量要求出发，分析了出现稳速系统锁相环“滑相”现象及在高速（180～202r／min）中“飞车”现象的原因，提出了提高LXJ－40离心机光栅测速系统信号质量的方法。
The characteristics of LXJ-40 centrifuge raster velocimetry system are analyzed. Based on the requirement of speed signal quality, the phenomena of “slip phase” of phase-locked loop of steady speed system and the phenomenon of “speeding” in high speed (180 ~ 202r / min) The reasons for raising the LXJ-40 centrifuge raster speed signal quality measurement methods.