Method and apparatus for non-destructively measuring internal fi

Details Method and apparatus for non-destructively measuring internal fi Method and apparatus for non-destructively measuring internal fi

1975-02-28

1976-06-29

Rolinec, R. V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 30A, 324 62, 324 65R, G01R 3124

Patent

active

039671917

ABSTRACT:
The resistance of a conductive film coating on the interior bulb wall of a fluorescent lamp is measured by capacitive coupling from the exterior bulb wall. A pair of metal bands engage the exterior bulb wall, with one band being connected to ground through a sensing resistor and the other band being connected through a series inductance to a variable frequency signal generator. The sinusoidal voltage output of the generator is set to a fixed frequency equal to or less than 15 KHz, and the series inductance is selected to provide a resonant circuit during lamp testing. The voltage across the sensing resistor is measured and compared with a predetermined reference voltage or a measurement of the generator output voltage to provide an indication of the internal film resistance of the tested lamp.

REFERENCES:
patent: 2793343 (1957-05-01), Wagner
patent: 3296523 (1967-01-01), Haas
patent: 3566695 (1971-03-01), Guderjahn
patent: 3612993 (1971-10-01), Tims

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