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| The Absolute Density Determination for A Single Crystal Silicon Sphere |
| LUO Zhi-yong |
| National Institute of Metrology, Beijing 100013, China |
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Abstract To determine Avogadro constant, the absolute density measurement of the single crystal silicon sphere is a decisive procedure. The current status of the density measurement of the single crystal silicon sphere,including measurement principles,measurement fields,influence factors,measuring devices and the best ability for the diameter measurement are introduced . The main difficulties and key techniques of density measurement is analyzed,and the development trend and technology prospect in related fields is predicted.
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2012, Vol. 33 
