高温气冷堆包覆燃料颗粒由ＵＯ２燃料核芯和在它表面沉积的热解碳和ＳｉＣ层材料构成．这些热解碳和ＳｉＣ层的厚度只有３０～９０μｍ，为测量这些微小颗粒包覆层材料的性能，专门研究了热解碳和ＳｉＣ层的厚度、密度和热解碳层的各项异性度，ＳｉＣ层的弹性模量等的测量方法，并研制了颗粒尺寸分析仪、小试样弹性模量测定仪等设备．本文简要地介绍这些测量方法和测量精度．密度的测量精度可达０．０１ｇ／ｃｍ３，Ｘ光照相法测量包覆层的厚度，精度可达１微米 The GMR-coated fuel particles consist of a UO2 fuel core and pyrolytic carbon and SiC layer materials deposited on its surface. These pyrolytic carbon and SiC layers have a thickness of only 30 to 90 μm. In order to measure the properties of these fine particle coating materials, the thicknesses and the densities of pyrolytic carbon and SiC layers and the anisotropy of pyrolytic carbon layers, SiC layer modulus of elasticity measurement methods, and developed a particle size analyzer, small sample elastic modulus tester and other equipment. This article briefly introduces these measurement methods and measurement accuracy. Density measurement accuracy up to 0.01g / cm3, X-ray photometry method to measure the thickness of the coating, the accuracy of up to 1 micron