Elevated sea pipelines are located in shallow areas. It is difficult to touch it and non-contact methods can be adopted only for most of inspection items.
跨海架空管道主要位于浅海区域，检验人员难以接近，大部分检验项目只能采用非接触式检验方法。
The main difficulty for improving the on-line diameter-measuring accuracy of large-sized axis depends on how the measurement position is accurately determined by non-contact methods.
提高大型轴类工件轴径在线测量精度，其主要困难在于用非接触法时如何精确地确定测量点的位置。
It is based on infrared radiation energy of the detected objects to determine their temperature, non-contact temperature measurement methods.
它根据被测物体的红外辐射能量确定其温度，为非接触测温方式。
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