Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Radiant energy controlled regulation of the current supply...
Reexamination Certificate
2011-04-12
2011-04-12
Choi, Jacob Y (Department: 2821)
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Radiant energy controlled regulation of the current supply...
C315S159000, C315S153000, C315S155000, C315S312000, C315SDIG002
Reexamination Certificate
active
07923936
ABSTRACT:
A fluorescent lamp sensor system is provided. The fluorescent lamp sensor system includes a plurality of bulbs and a plurality of electrodes coupled to the bulbs. A balanced differential circuit measures changes in electric fields produced by the bulbs in front of the electrodes. The balanced differential circuit includes a symmetric current source associated with alternating the surface potential of the bulbs. A current mode detection circuit detects the current associated with the capacitive effects of the balanced differential circuit. A synchronous detection circuit isolates the capacitive effects of the symmetrical current source from stray signals that differ in either frequency or phase.
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Avestruz Al-Thaddeus
Cooley John J.
Leeb Steven B.
Norford Leslie K.
Alemu Ephrem
Choi Jacob Y
Gauthier & Connors LLP
Massachusetts Institute of Technology
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