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本文通过模拟试验，利用扫描电镜研究了白炽灯分别在开灯和闭灯状态下撞碎时形成的钨丝热断痕迹及冷断痕迹。研究显示出钨丝在开灯时的热态和闭灯时的冷态下断裂，具有显著不同的断口痕迹特征。本文为刑事案件的侦查和道路交通事故责任的研究，提供了一种新的科学技术方法。
In this paper, through the simulation test, the scanning electron microscope (SEM) was used to study the hot and cold burn marks of the tungsten filament formed when the incandescent lamp crashed during turn-on and turn-off respectively. Studies have shown that the tungsten filament breaks down in the hot state when the lamp is turned on and the cold state when the lamp is turned off, and has markedly different fracture trace characteristics. This article provides a new method of science and technology for the investigation of criminal cases and the study of road traffic accidents.