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Original Articles

The Effect of Impact on the Filaments of Quartz Halogen Headlamps

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Pages 77-82 | Received 01 May 1986, Published online: 22 Nov 2013
 

ABSTRACT

Quartz halogen headlamps, unlike the older types of sealed beam headlamps, often have filaments oriented parallel to the forward direction of travel of the vehicle. Both compression and stretching of filament coils may be observed when vehicles equipped with quartz halogen headlamps are involved in collisions. The conditions under which these distortions occur have been studied by conducting impact tests on quartz halogen lamps under known conditions of velocity, illumination and impact angle. The results show that filament coil compression distortion was produced by the “head-on” impact of illuminated filaments, whereas coil stretching distortions were produced by impact of illuminated filaments at any angle. Further, if impact forces are of sufficient magnitude, an illuminated filament in an intact quartz halogen lamp can break.

RÉSUMÉ

Les phares quartz-halogène, contrairement aux phares ordinaires, montrent des filaments disposés dans la direction du déplacement du véhicule. Les spires des filaments peuvent alors subir une déformation par compression ou étirement lorsqu'un véhicule, doté de phares quartz-halogène, est impliqué dans une collision. Ces distortions ont été étudiées en effectuant des tests de chocs sur de tels phares et ce sous des conditions de vitesse, d'illumination et d'angle d'impact. Les résultats montrent qu'une compression des spires du filament fut produit par suite d'une collision frontale alors qu'une collision sous un certain angle montra un étirement du filament et ce lorsque le filament était allumé. De plus, si la collision est suffisamment forte, le filarrtent peut se briser alors que le phare demeure intact.

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