Fiber-diameter measurements can be carried out by applying the principle of the diffraction of white light. An instru ment (Mikronmeter) based on this principle is described. A sample of randomly arranged fibers produces a circular diffraction pattern the size of which is determined by the diameter of the fibers. Well-trained operators can measure fibre diameters very accurately, while randomly chosen operators can determine fiber diameter with a 95% confidence interval of about ±0.8 microns. Occasionally, some operators cannot use the instrument correctly.
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Yakovlev, V.V. , Measurement of Fiber and Filament Diameters by Diffraction Methods, IVUZ, Teklnol. Tekstilnoi Pram. No. 2,128-31 (1965): Technol. Textile Ind., USSR, No. 2, 27-30 (1965).
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