By using of computer’s dynamic microscopic observation and real-time image process-ing technology,an automatic ramie fiber fineness instrument was designed with selecting and exploiting of relative software of the CCD camera,the 3 D loading platform,the strobe light (synchronizedwith the movement of loading platform),the projection optical microscope,the stepping motor,etc.It can rapidly and accurately determine ramie fiber fineness index:the diameter (d,μm),the metric count (Nm ,m/g),the linear density (ρL,tex)and fiber irregularity (CV,%). The results showed that the instrument was stable and repeatable as well,small error and high accuracy. A ramie fiber sample was detected for 5 min to 6 min and the number of fiber specimens up to 1000/min. The success of developing of the in-strument has filled the gap in the field of the quick determination technologies of fiber fineness of ramie in China and provided guidance of ramie fiber products quasi -determination in ramie scientific research and production.%运用计算机的动态显微观察及实时图像处理技术，通过对CCD摄像头、三维载物平台与载物台同步移动的频闪光源、投影光电显微镜、步进电动机等主要硬件的选型与相关软件的开发，研究设计出一种全自动苎麻纤维细度仪。该仪器可快速、准确测定苎麻纤维细度指标直径（d，μm）、公制支数（Nm，m／g）、线密度（ρL，tex）及其纤维不匀率（CV，％）。结果表明，该仪器性能稳定、重现性好、检测误差小、准确度高，单个试样测试时间5 min ～6 min，且测定纤维试样根数达1000根／min以上。该仪器的研制成功，填补了我国苎麻纤维细度快速测定技术与设备的空白，为指导苎麻科研与生产中的苎麻纤维准确定等提供可靠支撑。
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