G - Physics – 08 – B
Patent
G - Physics
08
B
340/102
G08B 17/12 (2006.01)
Patent
CA 1229393
ABSTRACT OF THE DISCLOSURE A fire or explosion detection system is disclosed for discriminating between radiation produced by a hydrocarbon fire in an armored vehicle and radiation produced by the explosion of an armor-piercing ammunition round itself which does not cause a hydrocarbon fire. A radiation detector sensitive to radiation at 4.4 microns, characteristic of a hydrocarbon fire, produces logic output if the radiation intensity exceeds a predetermined relatively low threshold and is rising at at least a predetermined rate of rise. A detector operating at 0.9 microns, at which the exploding ammunition round produces significant radiation, produces logic outputs if the radiation intensity exceeds a predetermined relatively low threshold and if it is not falling at more than a predetermined rate. All these logic outputs are fed into a coincidence gate whose output feeds a time delay circuit which produces a fire or explosion indicating output only when the coincidence gate produces an output for at least a predetermined period of time. A third radiation detector, in combination with the 0.9 micron detector, measures the color temperature of the source being monitored, and inhibits the coincidence gate if the color temperature exceeds a predetermined value. This prevents the system reacting merely to muzzle flash from a gun or the like. However, any such inhibition is permitted to last only for a predetermined period of time, so that the system can still detect a fire in the presence of high color temperature sunlight. A medium threshold unit is provided to produce an inhibit signal for a relatively short period of time if the output of the O.9 micron detector exceeds a medium-level threshold. This primarily prevents the coincidence gate from reacting to relatively prolonged signals from an indirectly viewed ammunition round and its hot fragments.
477055
Ball David N.
Farquhar Robert L.
Henry Richard V.
Hutchins Peter L.
Rowe Vincent M.
Graviner Limited
Riches Mckenzie & Herbert Llp
LandOfFree
Fire and explosion protection system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fire and explosion protection system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fire and explosion protection system will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1283256