Abstract: Based on linear array technology for measuring diameter, use the method of measuring yarn diameter with linear CCD laser sensor and estimating hairiness, to propose algorithm of filtering process on recursive averaging for Line Profile signal of yarn diameter and linear interpolation on acquiring the diameter pixel coordinates. This article also plotted a contactless real-time measuring system and experiment scheme. Verified the algorithm of recursion average filtering by the experimental simulation, and analyzed the influence of diameter pixels with different fluctuation threshold and the variation of sub segments hairiness and diameter. The results confirm the validity of the algorithm of obtaining the yarn diameter, the feasibility of the measurement system and the good reproducibility of the test results. And the system can accurately measure the yarn diameter and estimate hairiness, The data now can be analysed automatically on real-time, thus this article provide certain theoretical reference and experiment data for the textile process parameters monitoring.

Key words: linear array, yarn diameter, hairiness, recursive averaging