利用ATR谱及SEM图像鉴别刹车气管的断裂方式

Exploration of the Broken Parts of a Brake Hose by ATR-FTIR and SEM

分别采用傅里叶变换衰减全反射红外光谱法(ATR-FTIR)及扫描电镜法(SEM)对一起交通事故中涉及的刹车气管进行了断端成分分析及微观形态检验,以此对体式显微镜检验结果进行补充。仪器分析结果显示,刹车气管断裂处的橡胶存在老化现象,刹车气管外侧橡胶层存在脆性断裂,内侧橡胶层存在原始空洞,多种原因共同导致了断裂的发生。实验结果表明,通过采集涉案物品的ATR谱与SEM图像,可以快速、准确并客观地反映事实真相,从而对传统的交通痕迹检验形成有效的补充。

ATR-FTIR and SEM were respectively utilized to analyze the chemical components and to observe the micromorphology of a broken brake hose from a traffic case,which could be a supplementary for the traditional microscopic examination.The instrumental analysis results indicated that the rubber from the brake hose had already aged;the rubber from external side had experienced brittle fracture and there were original hollows in the rubber from internal side.The breaking of the brake hose resulted from all these reasons.The experimental results also demonstrated that the fact could be reflected efficiently,accurately and objectively by the application of ATR-FTIR and SEM to the physical evidence from a case.Therefore,it could be an effective complement for traditional traffic trace examination.