傅立叶红外光谱波数示值误差不确定度评定.doc

傅立叶变换红外光谱仪示值误差不确定度评定1.数学模型式中：波数示值误差，cm-1；第i峰值波数测量平均值，cm-1；第i峰值波数标准值，cm-1。1.1方差和灵敏系数数学模型中各项彼此独立，则其中：，。2.标准不确定度分量评定2.1由标准物质引入的不确定度由标准物质证书给出，其结果见表1.表1.标准值（cm-1）540.17841.84906.841028.561069.201154.631583.13扩展不确定度1.000.230.080.090.210.030.030.500.1150.040.0450.1050.0150.015标准值（cm-1）1601.342849.723001.393026.083060.023082.17扩展不确定度0.030.090.040.050.060.050.0150.0450.020.0250.030.0252.2波数测量的不确定度2.2.1由测量重复性引入的不确定度分量选择一台性能稳定的的傅立叶变换红外光谱仪，重复三次测量聚苯乙烯标准物质各参考吸收峰值，其结果见表2.,由极差法得:，式中C极差系数R极差n测量次数各峰值测量重复性的不确定度结果也见表2.。表2.标准值（cm-1）540.17841.84906.841028.561069.21154.631583.13测量值（cm-1）1539.56841.48906.841028.531069.351154.641583.232539.84841.35906.821028.531069.311154.631583.243539.71841.46906.791028.481069.241154.591583.23平均值539.70 841.43906.82 1028.51 1069.30 1154.621583.23 极差0.280.130.050.050.110.050.010.10 0.05 0.02 0.02 0.04 0.02 0.004 0.0990.0460.0180.0180.0390.0180.0046标准值（cm-1）1601.342849.723001.393026.083060.023082.17测量值（cm-1）11601.442849.563001.493026.063060.013082.2421601.422849.723001.493025.943060.13082.2131601.42849.563001.533025.973060.063082.17平均值1601.422849.61 3001.50 3025.993060.06 3082.21 极差0.040.160.040.120.090.070.01 0.06 0.01 0.04 0.03 0.02 0.0140.0560.0140.0420.0320.0252.2.2仪器示值分辨力引入的不确定度分量按上述傅立叶变换红外光谱仪，波数分辨力为0.01 cm-1，考虑为均匀分布。 cm-12.2.3. 合成标准不确定度由于由测量重复性引入的不确定度分量，仪器示值分辨力引入的不确定度分量独立不相关，所以。其结果见表2.3.的合成标准不确定度由于与独立不相关，所以：表3.标准值（cm-1）540.17841.84906.841028.561069.201154.631583.130.500.1150.040.0450.1050.0150.0150.0990.0460.0180.0180.0390.0180.00460.510.120.0440.0480.110.0230.0161.020.240.0880.0960.220.0460.032标准值（cm-1）1601.342849.723001.393026.083060.023082.170.0150.0450.020.0250.030.0250.0140.0560.0140.0420.0320.0250.0210.0720.0240.0490.04