Method of detecting conductive material contained in glass fiber

Details Method of detecting conductive material contained in glass fiber Method of detecting conductive material contained in glass fiber

1987-06-17

1989-04-25

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

331 65, 340677, G01N 2782, G08B 2100

Patent

active

048251585

ABSTRACT:
A method and apparatus for detecting conductive material contained in glass fiber, in which it is possible to detect fine conductive material contained in glass fiber under the condition that the glass fiber is running in the process of manufacturing the glass fiber, and in which it is possible to detect only the conductive material accurately without being affected by moisture or the like. The method and apparatus are arranged such that a state of oscillation is generated in advance by using an LC oscillator or the like disposed in the vicinity of a moving path of glass fiber in the manufacturing process so that a change may be caused in a reactance element in the oscillator by conductive material which may be contained in the glass fiber to thereby cause a change in the state of oscillation, the change in oscillation output being taken out as changed in amplitude and frequency by using an AM detector and an FM detector respectively, the taken-out AM and FM detection signals being combined with each other by a composite wave generator, the composite wave signal being compared with a reference level to thereby detect the conductive material maldistributed in the glass fiber.

REFERENCES:
patent: 2580670 (1952-01-01), Gilbert
patent: 3737764 (1973-06-01), Dufayet
patent: 3745451 (1973-07-01), Goyette
patent: 3974442 (1976-08-01), Savidge et al.
patent: 4004216 (1977-01-01), Natens et al.
patent: 4286261 (1981-08-01), Wagner et al.
patent: 4473799 (1984-09-01), Favre
Ogren, V. G., Sensor Circuit Utilizing Variable Inductance Input, IBM Tech. Discl. Bull., vol. 14, No. 4, Sep. 1971, p. 1225.

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