System for measuring optical waveguide fiber diameter

Details System for measuring optical waveguide fiber diameter System for measuring optical waveguide fiber diameter

C - Chemistry, Metallurgy

03

B

341/42

C03B 37/02 (2006.01) C03B 37/025 (2006.01) G01B 11/10 (2006.01) G01N 21/47 (2006.01)

Patent

CA 1132374

Abstract of the Disclosure The diameter of an optical fiber being drawn is moni- tored and controlled by an optical measuring technique. An electrical input signal is generated from the fringe pattern produced by directing a laser beam onto the fiber. The input signal is connected to appropriate terminals of first, second, third and fourth comparators. The input signal is delayed 180° to provide an input signal to the remaining two terminals of the first and second comparators and is delayed 90° to provide an input signal to the remaining terminals of the third and fourth comparators. The output pulses from the comparators are shaped, summed and counted to provide a control signal for the fiber drawing apparatus.

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