Infrared overheat and fire detection system

Details Infrared overheat and fire detection system Infrared overheat and fire detection system

1990-04-10

1991-10-22

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

250342, 250353, 318490, 340511, 340515, 340584, G08B 1712

Patent

active

050599534

ABSTRACT:
A system for detecting an overheat condition in aircraft preferably includes two control units each connected to eight thermal imaging modules. The thermal imaging modules monitor the cargo by for an overheat condition and if any module detects an overheat condition, the control unit verifies the overheat condition and then triggers an alarm. The control units execute routines to monitor and test their operational status and that of each thermal imaging module. The control units are connected to the aircraft electronics to indicate the location of an overheat condition or any malfunctioning control units and thermal imaging modules. The thermal imaging modules are identical to each other and include an infrared detector, a rotating optical assembly, threshold circuitry and a motor. The optical assembly is rotated by the motor to provide the detector with a conical field of view. The optical assembly focuses the radiation in the cargo bay on the infrared detector. If the infrared detector measures a radiation level equal or greater than that of a fire, the threshold circuitry outputs an overheat signal to the control unit. The thermal imaging module also includes a thermal switch that will trigger an overheat signal if the temperature of the module itself is above a specified temperature.

REFERENCES:
patent: 4749862 (1988-06-01), Yoshida et al.
patent: 4769545 (1988-09-01), Fraden

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