求翻译：固体发动机包覆层厚度检测一直是国内外研究的重点， 包覆层太厚或太薄均会影响其正常工作,因此在浇注推进剂之前,应对包覆层的厚度进行测量,以避免发动机故障。 固体发动机包覆层厚度检测一直是国内外研究的重点，在对包覆层进行厚度检测时，一般采用超声纵波对包覆层进行非接触式测量，本文主要讲述利用纵波的回波特性测量包覆层厚度。在对超声信号进行处理时，提出用解卷积法对信号通过包覆层界面的时间差进行估算，提高了火箭发动机包覆层厚度测量的精确度。是什么意思？

Coating thickness testing of solid rocket motor has been the focus of the study at home and abroad, the coating is too thick or too thin will affect their normal work, before pouring propellant response to the thickness of the coating were measured in order to avoid engine failure . Coating thicknes

Solid engine package laminate thickness test has been the focus of the study, both at home and abroad by layer is too thick or too thin will affect their work, and therefore the gate before the propellant, you should package the laminate thickness measurements to avoid engine failures. Solid engine