论文部分内容阅读
直径小于100微米的微小细丝的精确测量至今还是一个复杂的问题。尤其是纤维(如合成纤维、炭素纤维、光学纤维)其质脆易断、受压则变形,不允许用接触法进行测量,目前主要采用光学显微和天秤称量法。由于激光具有良好的相干性,将激光束照射到纤维上,可以产生很清晰的朗夫霍菲图象,衍射条纹宽度反比于纤维直径。据此,为纤维细丝直径的测量提供了一个新的测量方法——激光衍射法。激光衍射法是非接触测量,对被测纤维无破坏作用,其精度很高,可以优于0.1微未,采用光电转换及脉冲数字技术,使测量非常简便。由于激光束很细,可以测出纤维上任意部位的直径,从而求得纤维粗细的分布情况。此方法可以直接用于生产线上,监视生产过程中纤维粗细的变化,实现自动化控制。
The precise measurement of fine filaments of less than 100 microns in diameter is still a complex issue to date. In particular, fibers (such as synthetic fibers, carbon fibers, optical fibers) are brittle and fragile, and are deformed under pressure. Contact measurement is not allowed. At present, optical microscopy and weighing scales are mainly used. Due to the good coherence of the laser beam, a laser beam impinges on the fiber to produce a very clear image of the Lanfhoff image, the width of which is inversely proportional to the fiber diameter. Accordingly, a new measurement method for the measurement of fiber filament diameter - laser diffraction is provided. Laser diffraction is a non-contact measurement, no damage to the measured fiber, its high accuracy, better than 0.1 micro-Wei, the use of photoelectric conversion and pulse digital technology, the measurement is very simple. As the laser beam is very thin, you can measure the diameter of any part of the fiber, so as to find the distribution of fiber thickness. This method can be used directly in the production line, monitor the changes in the thickness of the fiber in the production process, to achieve automation and control.