Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1980-06-27
1982-03-30
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
73359R, 73DIG7, 340589, 340632, G01K 730, G08B 1706
Patent
active
043227252
ABSTRACT:
The invention provides a fire detection system which comprises an electric thermal transducer such as a thermistor placed in a turbulent gas stream. The transducer produces a signal, having an AC and a DC component, which signal is preferably amplified. The components are separated out in a discriminator, for instance an AC amplifier and the AC component is squared and integrated to give a final output which is proportional to the temperature of a heat source, such as a fire, upstream of the transducer. The invention also provides a fire detection system comprising a series of transducers connected to a single processing apparatus, the signal from the transducers being compared to locate a heat source. The invention also provides a method of detecting a fire using a system as described above.
REFERENCES:
patent: 2827624 (1958-03-01), Klein
patent: 2884786 (1959-05-01), Burk et al.
patent: 3818761 (1974-06-01), Brixy et al.
patent: 3878723 (1975-04-01), Blalock et al.
patent: 3890841 (1975-06-01), Brixy
patent: 3937086 (1976-02-01), von Thuna
patent: 4099413 (1978-07-01), Ohte et al.
Caldwell Sr. John W.
Coal Industry (Patents) Limited
Nowicki Joseph E.
Wray James C.
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