Electric heating – Heating devices – Resistive element: igniter type
Patent
1999-12-09
2000-08-01
Jeffery, John A.
Electric heating
Heating devices
Resistive element: igniter type
219270, 228104, 374 5, 324501, 324502, 29593, 1022027, 1022029, 102530, F24B 312, F24B 319, G01N 2572, G01R 3100
Patent
active
060969970
ABSTRACT:
A method of assembling an igniter (24) for a gas generating composition (18) comprises providing a pair of spaced apart electrodes (40 and 42) and providing a heat ignitable material (46). A heating element (44) is spot electrical resistance welded to the electrodes (40 and 42). The heating element (44) has flattened portions (110 and 112) at the spot welds (102 and 104) and a central portion between the spot welds (102 and 104) adapted for contact with the heat ignitable material (46). A test level of electric current is directed between the electrodes (40 and 42) and through the heating element (44) and the spot welds (102 and 104) at a level effective to heat the heating element (44) and the spot welds (102 and 104). The level infrared radiation emitted by the heating element (44) and the spot welds (102 and 104) is sensed, throughout a scanned field which fully encompasses the heating element and the welds, under the influence of the test level of electric current. The sensed levels of infrared radiation emitted by the heating element (44) and the spot welds (102 and 104) are compared. The heat ignitable material (46) is installed in heat transferring relationship with the heating element (44) if the sensed level of infrared radiation emitted by one or both of the spot welds (102 and 104) is greater than the sensed level of infrared radiation emitted by the heating element (44).
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Jeffery John A.
TRW Inc.
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