Radiant energy – Photocells; circuits and apparatus – Flame light source
Patent
1974-03-18
1976-02-03
Stolwein, Walter
Radiant energy
Photocells; circuits and apparatus
Flame light source
250206, 3402282, 431 79, G01N 2158
Patent
active
039366480
ABSTRACT:
A filter having a cut-off frequency of the order of 50Hz is included in the circuit of flame monitoring apparatus to remove signals below the cut-off frequency. In the circuit shown, a silicon p-n junction photo-electric pick-up is capacitively connected to an amplifier, the amplifier is connected to a high-pass filter, the output of the filter is connected to a further amplifier, the output of the further amplifier is applied to a detector integrator, the output of the detector integrator is connected to a Schmitt trigger, and the output of the trigger is applied to an output circuit giving a warning signal if the flame being monitored is extinguished. The use of sighting tubes for the photo-electric pick-ups is disclosed.
REFERENCES:
patent: 2794974 (1957-06-01), Bagno et al.
patent: 3613062 (1971-10-01), Bloice
patent: 3742474 (1973-06-01), Muller
patent: 3820097 (1974-06-01), Larson
Cormault Pierre J. B.
Megnoux Jean M.
Electricite de France
Flocks Karl W.
Stolwein Walter
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