Abstract：To determine air density for high accuracy measurement of the weights, the method using the recommended equation is studied. According to the CIPM-2007 equation, an equipment of air density measurement that for high accuracy measurement of the weights is developed. Measurement of temperature, humidity, pressure and CO2 are integrated on it to measure air density automatically. Comparing with the results using approximation formula for air density, the relative error of 0.022% is achieved when CO2 is 937.4×10-6. The experimental results prove that additional measurement of CO2 can improve accuracy of air density measurement.
王肖磊,王健,钟瑞麟,张跃,蔡常青,姚弘,丁京安. 砝码质量测量中的空气密度测量装置的研究[J]. 计量学报, 2011, 32(1): 40-43.
WANG Xiao-lei,WANG Jian,ZHONG Rui-lin,ZHANG Yue,CAI Chang-qing,YAO Hong,DING Jing-an. Study on Air Density Measurement for Measuring Weights. Acta Metrologica Sinica, 2011, 32(1): 40-43.
［1］罗志勇,刘子勇,刘吉萍,等.便携式空气密度精密测量仪的研制［J］.计量学报,2001,22(1):52-56.
［2］JJG 99—2006,砝码检定规程［S］.
［3］OIML R 111-1:2004, Weights of classes E1, E2, F1, F2, M1, M1-2, M2, M2-3, and M3 Metrological and technical requirements ［S］.
［4］Picard A, Davis R S, Glser M, et al. Revised formula for the density of moist air (CIPM-2007)［J］. Metrologia,2008, 45:149-155.
［5］Harveya A H, Lemmon E W. Correlation for the second virial coefficient of water［J］. J Phys Chem Ref Data,2004, 33(1):369-376.
［6］Harvey A H, Huang P H.First-Principles Calculation of the Air-Water Second Virial Coefficient［J］. International Journal of Thermophysics, 2007,28(2): 556-565.
2011, Vol. 32 
