热处理、碳化、淬火硬化层，表面覆层，钢，有色金属，微小及薄形零件等。
Heat treated layer, carbonized layer, hardened hard layers, superficial coating, steels, non-ferrous metal, micro and thin shaped components.
用超声测量火箭发动机装药包覆层厚度时，当包覆层较薄时检测回波信号会出现时域混叠。
When the cladding thickness of rocket motor is measured with ultrasonics, the test echoes of the thin cladding will overlap in the time field.
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