초록 ▼

A fire or explosion detection system is disclosed for reliably discriminating between a hydrocarbon fire in an armored vehicle and other sources of radiant energy including explosion of an armor-piercing ammunition round without an accompanying hydrocarbon fire. Radiation detectors sensitive to radi

A fire or explosion detection system is disclosed for reliably discriminating between a hydrocarbon fire in an armored vehicle and other sources of radiant energy including explosion of an armor-piercing ammunition round without an accompanying hydrocarbon fire. Radiation detectors sensitive to radiation at 4.4 microns and 0.9 microns, respectively, each produce logic outputs if the viewed radiation intensity exceeds a predetermined relatively low threshold and, in the case of the 4.4 micron detector, is rising at least a predetermined rate or, in the case of the 0.9 micron detector, is not falling at more than a predetermined rate. The logic outputs are fed to a coincidence gate which produces a fire- or explosion-indicating output only if all of the outputs are received concurrently 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 radiation source being monitored, and inhibits the coincidence gate if the color temperature exceeds a predetermined value. Further discriminating capability is provided in the form of a medium threshold unit operable to produce an inhibit signal for a relatively short period of time if the output of the 0.9 micron detector exceeds a medium-level threshold.

대표청구항 ▼

A fire or explosion detection system for discriminating between radiation produced by a source of fire or explosion to be detected and radiation produced by a source of fire or explosion not to be detected, comprising first and second radiation detecting means respectively responsive to radiation in

A fire or explosion detection system for discriminating between radiation produced by a source of fire or explosion to be detected and radiation produced by a source of fire or explosion not to be detected, comprising first and second radiation detecting means respectively responsive to radiation in first and second wavelength bands the second of which is a characteristic wavelength band for a source of fire or explosion to be detected and operative to produce first and second radiation-intensity-dependent electrical signals respectively, output means connected to monitor the first and second signals and operative, unless inhibited by an inhibiting signal, to produce a fire or explosion indicating output only when, for at least a predetermined period of time, the magnitudes of both the first and second signals exceed respective first and second predetermined thresholds and the magnitude of at least said first signal is not falling at more than a predetermined rate, inhibiting means operative to monitor the color temperature of the radiation source viewed by the first and second radiation detecting means to produce an inhibiting signal when the color temperature exceeds a predetermined color temperature threshold, and means connecting the inhibiting signal to inhibit the output means.