Method of and apparatus for continuously monitoring diameter var

Details Method of and apparatus for continuously monitoring diameter var Method of and apparatus for continuously monitoring diameter var

1982-07-02

1985-06-18

Smith, William F.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 101, 65 13, 65 29, 65158, 65163, C03B 3702

Patent

active

045239380

ABSTRACT:
An optical fiber, being drawn from a preform and wound upon a reel, passes between parallel plates of a capacitor connected in a measuring circuit which, from the capacitance variations due to changes in fiber diameter, controls a reel-driving motor to minimize these variations. The capacitor may have a constant charge, as by having one of its plates made of an electret, in which case the capacitance variations are determined from voltage changes. A calculator connected to the measuring circuit translates these variations into numerical values representing the fiber diameter which can be visually displayed.

REFERENCES:
patent: 3088297 (1963-05-01), Kapany et al.
patent: 3221171 (1965-11-01), Locher
patent: 3865564 (1975-02-01), Jaeger et al.
patent: 4060965 (1977-12-01), Schwartz
patent: 4123242 (1978-10-01), Imoto et al.
Gutmann, "The Electret", Reviews of Modern Physics, vol. 20, No. 3, Jul. 1948, pp. 457-470.

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