Flame detector

Details Flame detector Flame detector

1977-12-01

1979-06-05

Edlow, Martin H.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

328 1, 328 94, 340577, H04B 1714, G08B 2100

Patent

active

041575067

ABSTRACT:
A method and apparatus for processing signals produced by a flame detector. A phase-locked loop is used to generate a binary indication of whether the signal from a flame probe is within a predetermined frequency band. A signal indicative of the average analog value of the resulting pulse train is produced and tested to determine whether it is in a range consistent with flame presence. The resultant binary signal is ANDed with a binary determination of whether the average DC value of the probe signal is within a range consistent with flame presence, and if both the DC and the frequency indications imply possible flame presence, then flame presence is indicated.

REFERENCES:
patent: 3553664 (1971-01-01), Tucker
patent: 3609364 (1971-09-01), Paine
patent: 3627458 (1971-12-01), Wade
patent: 3716717 (1971-05-01), Scheidweiler et al.
patent: 3940753 (1974-09-01), Muller

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