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包覆燃料颗粒的质量对于高温气冷堆安全运行起着重要作用。包覆燃料颗粒的镀层密度是影响颗粒质量的重要指标。因此，准确、及时地在线检测包覆燃料颗粒各镀层的密度，对于保证包覆燃料颗粒符合设计要求有着重要意义。在借鉴国内外同行研究成果的基础上，针对包覆燃料颗粒镀层的特点，研究并建立了一套满足实际生产需要的在线快速测试密度的综合方法。这包括着填装法、尺寸—质量法、比重瓶法和重液悬浮法。简要地介绍了这些在线性能测试方法，给出了一些测试数据，讨论了测量误差产生的主要原因。
The quality of the coated fuel particles plays an important role in the safe operation of the HTGR. Coating density of coated fuel particles is an important indicator of particle quality. Therefore, accurate and timely on-line detection of coated fuel particles of the coating density, to ensure that coated fuel particles meet the design requirements is of great significance. Based on the research results of domestic and foreign counterparts, aiming at the characteristics of coated fuel particles coating, a set of online rapid test density method to meet the actual production needs was established and established. This includes filling methods, size-mass methods, pyknometer methods and heavy-liquid suspension methods. A brief introduction to these online performance testing methods is given, some test data are given, and the main reasons for the measurement error are discussed.