The thermographic method as a nondestructive testing for the detection of subsurface defects is investigated. Results are given for the evaluation of defects in a series of thin-walled materials.
研究了红外热成象技术用于近表面缺陷的探测，给出了对两种薄壁材料中缺陷的探测结果。
When subsurface investigation reveals structural defects in the foundation area to be used for a structure, the foundation must be strengthened.
本地下勘探表明地基地区存在不良地层时，必须加固地基。
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