发明名称 |
Circuit arrangement for detecting the amount of deposited electrode material on the wall of a lamp vessel |
摘要 |
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.
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申请公布号 |
US5689156(A) |
申请公布日期 |
1997.11.18 |
申请号 |
US19960583687 |
申请日期 |
1996.01.05 |
申请人 |
U.S. PHILIPS CORPORATION |
发明人 |
DERRA, GUENTHER H.;FISCHER, HANNS E.;GANSER, HANS G.;MOENCH, HOLGER |
分类号 |
G01N21/01;G01J1/00;H01J7/42;H01J9/42;H01J61/00;H01J61/56;(IPC1-7):H05B37/00 |
主分类号 |
G01N21/01 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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