Circuit arrangement for detecting the amount of deposited electr

Details Circuit arrangement for detecting the amount of deposited electr Circuit arrangement for detecting the amount of deposited electr

1996-01-05

1997-11-18

Pascal, Robert

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch cut-out

315119, 315120, H05B 3700

Patent

active

056891563

ABSTRACT:
The invention relates to a measuring circuit for detecting the amount of deposited electrode material on the wall of a lamp vessel of a discharge lamp by measuring the power of infrared radiation within a specific wavelength range, comprising a detector for generating an electrical signal constituting a measure for the power of the infrared light in said specific wave length range. According to the invention the measuring is done in a time lapse starting after a predetermined time interval following the extinguishing of the discharge lamp. An increased accuracy of the measurement is thereby realized.

REFERENCES:
patent: 3683226 (1972-08-01), Witting
patent: 5109181 (1992-04-01), Fischer et al.

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