Device for measuring the tensile stress of an optical fiber or corresponding wire by means of an acoustic surge.

摘要

The invention relates to an on-line tension meter for an optic fiber (11), which measures the tensile stress (T) of a bare optic fiber (11) without a contact, when the optic fiber (11) is drawn in a draw machine. A loudspeaker (12) produces into the fiber a wire wave (15), the measured advancing speed (v) of which indicates the fiber tension. The speed is measured with two location-sensitive electro-optic indicators or cameras (16), the distance (L) therebetween being known. <IMAGE>