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计量学报  2013, Vol. 34 Issue (2): 97-100    DOI: 10.3969/j.issn.1000-1158.2013.02.01
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基于压浮原理的单晶硅球密度比较测量方法研究
刘子勇,王金涛,许常红,罗志勇,陈朝晖
中国计量科学研究院, 北京 100013
Research on Comparison Measurement of Single-crystal Silicon Sphere Density Based on  Pressure Floatation Method
LIU Zi-yong,WANG Jin-tao,XU Chang-hong, LUO Zhi-yong
National Institute of Metrology, Beijing 100013, China
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摘要 为了克服单晶硅球密度测量静力称重法精度受液体表面张力的影响,研究了压浮法进行单晶硅球密度精密比较测量方法和测量系统。在一定的温度下,调节压力,利用液体压缩系数控制液体密度使标准单晶硅球和被测单晶硅球稳定悬浮于工作液体中,通过温度、压力和悬浮高度的测量,计算出二者之间的密度差值。通过双层控温系统保证了液体温度长期波动在±0.25 mK内,利用标准单晶硅球在不同温度-压力悬浮条件线性关系计算出液体压缩系数。试验证明,压浮法测量装置实现了单晶硅球密度差值的精密测量,标准测量相对不确定度为2×10-7
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关键词 计量学单晶硅球密度压浮法比较测量温度控制系统液体压缩系数    
Abstract:To overcome the influence of liquid surface tension on the density measurement of single-crystal silicon sphere with hydrostatic method, pressure-of-flotation (PF) method and measurement system were developed to carry out the comparison measurement of single-crystal silicon sphere density. On the condition of certain temperature, the pressure of liquid was adjusted, which caused the change of liquid density, and the standard and measured single-crystal silicon spheres could be suspended in the liquid stably. By measuring liquid temperature, pressure and suspension heights, the density difference was determined. Double-level temperature control system was used to achieve stable temperature within ±0.25 mK. The liquid compress coefficient was determined by the linear equation of temperature-pressure suspension condition. It was verified by experiments that the density difference of single-crystal silicon spheres could be measured with high precision, and the standard relative uncertainty is 2×10-7.
Key wordsMetrology    Single-crystal silicon sphere    Pressure floatation method    Density    Comparison measurement    Temperature control system    Liquid compress coeffi-cient
    
基金资助:国家自然科学基金(51105347); 国家质量监督检验检疫总局量值传递资助项目(LC0502)
作者简介: 刘子勇(1955-),男,山西临汾人,中国计量科学研究院高级工程师,主要从事容量计量科学技术的研究。liuzy@nim.ac.cn
引用本文:   
刘子勇,王金涛,许常红,罗志勇,陈朝晖. 基于压浮原理的单晶硅球密度比较测量方法研究[J]. 计量学报, 2013, 34(2): 97-100.
LIU Zi-yong,WANG Jin-tao,XU Chang-hong, LUO Zhi-yong. Research on Comparison Measurement of Single-crystal Silicon Sphere Density Based on  Pressure Floatation Method. Acta Metrologica Sinica, 2013, 34(2): 97-100.
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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2013.02.01     或     http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2013/V34/I2/97
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