Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1979-04-20
1981-02-03
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
250339, 340587, G08B 1712
Patent
active
042491681
ABSTRACT:
The detector has first and second circuits which are interconnected. The first circuit senses the emission of a flame at least in the wavelength range of carbon dioxide and produces square-wave signals corresponding to the flicker frequency. The second circuit senses short wavelength emission with a wavelength shorter than 3 .mu.m and produces square-wave signals corresponding to the flicker frequency of the emission. The interconnecting means permits the alarm means to be activated only when the first circuit signals and the second circuit signals are present simultaneously and with the same direction, to indicate that the flicker frequency is the same for both emissions. An integrator prevents spurious coinciding signals from resulting in an alarm and a reset circuit periodically resets the integrator. Various specific photoelectric means are described.
REFERENCES:
patent: 2897485 (1959-07-01), Johnson
patent: 3716717 (1973-02-01), Scheidweiler et al.
patent: 3742474 (1973-06-01), Muller
patent: 3940753 (1976-02-01), Muller
patent: 4101767 (1978-07-01), Lennington et al.
patent: 4160163 (1979-07-01), Nakauchi
patent: 4160164 (1979-07-01), Nakauchi
patent: 4179606 (1979-12-01), Nakauchi et al.
Report of Fire Research Institute of Japan, No. 30, Dec., 1969.
Cerberus AG
Swann III Glen R.
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