If the temperature difference between normal and damaged tunnel lining is more than 3 , the thermography image is clear 隧道衬砌之红外线热影像温差大于3区域为有缺陷部位,温差较低区域则为完好之隧道衬砌。
If the temperature difference between normal and damaged tunnel lining is more than 3 , the thermography image is clear 隧道衬砌之红外线热图象温差大于3区域为有缺陷部位,温差较低区域则为完好之隧道衬砌。