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Microwave Dielectric Measurements on Single Fibers

Western Utilization Research Branch, Agricultural Research Service, United States Department of Agriculture, Albany 10, California

T.M. Shaw

Western Utilization Research Branch, Agricultural Research Service, United States Department of Agriculture, Albany 10, California

Microwave techniques which have proved successful at frequencies of 3,000 and 9,300 Mc for the determination of the complex dielectric constant of fiber bundles have been extended to include a frequency of 26,000 Mc, where for the first time measure ments on a single wool fiber have proved to be feasible. Such measurements make it possible to compare directly the results of electrical and mechanical measurements on the same single fiber. In addition, the single-fiber technique has provided a con venient, rapid, and nondestructive method for the determination of the average mass of adjacent 1-cm sections of the fiber along its length. Variations as large as two-fold in mass per unit length are sometimes encountered within a single wool fiber. The occurrence of these variations and their effect upon mechanical measurements are discussed.

Textile Research Journal, Vol. 25, No. 10, 865-870 (1955)
DOI: 10.1177/004051755502501005


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