Abstract
A tone burst of ultrasonic waves in air is scattered on passing through a pad of fibers. The distribution of spatial frequencies within the tone burst is found to be affected by the physical characteristics of the fiber used, and becomes a means of identifying fibers. Known cotton fiber samples whose properties have been studied previously by x‐ray diffraction are used to scatter 1‐MHz ultrasonic waves in air. Spectrum analysis of the transmitted tone bursts produces characteristic spectra which correlate well with the x‐ray diffraction results. Reliable tests can be made with samples weighing as little as 0.36 g.
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