JJG 981-2003 阿贝折射仪标准块

霸霸场

中华人民共和国国家计量检定规程

JJG981-2003

阿贝折射仪标准块

StandardBlocksforAbbeRefractometers

2003一09一23发布2003一12一23实施

国家质量监督检验检疫总局发布

JJG981-2003

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本规程经国家质量监督检验检疫总局2003年09月23日批准，并自

2003年12月23日起施行。

归口单位:全国光学计量技术委员会

主要起草单位:中国计量科学研究院

本规程委托全国光学计量技术委员会负责解释

JJG981-2003

本规程主要起草人:

刘文丽(中国计量科学研究院)

马振亚(中国计量科学研究院)

杨磊(中国计量科学研究院)

姜石锋(中国计量科学研究院)

JJG981-2003

目录

1范围··························································································……(1)

2概述·························································································……(1)

3计量性能要求·············································································……(1)

4通用技术要求··············································································……(1)

4.1外观·······················································································……(1)

4.2维护保养················································································……(2)

4.3几何参数·················································································……(2)

5计量器具控制··············································································……(2)

5.1检定条件·················································································……(2)

5.2检定项目·················································································……(3)

5.3检定方法·················································································……(3)

5.4检定结果的处理········································································……(5)

5.5检定周期·················································································……(5)

附录A常用折射液的折射率及配制方法························-····················……(6)

附录B折射率(nu)值的测量不确定度评定方法·································……(7)

附录C平均色散(n;一n.)值的测量不确定度评定方法························……(10)

附录D阿贝折射仪标准块检定记录···················································……(12)

附录E阿贝折射仪标准块检定证书、检定结果通知书(内页)格式·········……(14)

JJG981-2003

阿贝折射仪标准块检定规程

范围

本规程适用于阿贝折射仪标准块的首次检定、后续检定和使用中检验。阿贝折射仪

配备的工作样块的折射率检定依照本规程执行。

2概述

阿贝折射仪标准块(以下简称标准块)是用来检定阿贝折射仪及其他利用阿贝折射

原理的计量仪器的标准计量器具(块)。阿贝折射仪工作样块(以下简称工作样块)是

阿贝折射仪配备的，用于调整、检查阿贝折射仪。

标准块组由轻冕玻璃QK1，冕玻璃K9，火石玻璃F2，重火石玻璃ZF2四种优质光

学玻璃材料加工制成的长方形块组成。

光学玻璃材料折射率的测量主要有精密测角法、V棱镜折射法、阿贝折射法及浸液

法。本规程采用V棱镜折射法。

利用V棱镜折射仪，采用比较测量法，对标准块组的各三条谱线的折射率进行测

量。用D谱线测得折射率nD值，用F谱线与C谱线测得的n;与n,值之差即为平均色

散(n;一nc)值。如需测量其他谱线的折射率(如n.)值，则应采用相应的谱线(如

汞灯中的e线)。

V棱镜折射法测量原理如下:

如图1所示，当单色平行光束垂直人射到V棱镜后，经V棱镜和样品的多次折射，

出射光线发生偏折。根据折射定律，按公式(1)计算样品的折射率n

n=(n孟+sing伽孟+si.10)111(1)

式中:%-V棱镜光学玻璃的折射率;

B—光束从V棱镜最后一面出射的偏折角。

当n=n。时，0=0;

当n大于n。时，0为正值;

当n小于n。时，.B为负值。

3计.性能要求

1标准块折射率(nD)值的测量不确定度不应超过5x10-'(k=3)o

2标准块平均色散(nF一nc)值的测量不确定度不应超过7x10-'(k=3)a

3工作样块折射率(n,)值的测量不确定度应满足1x10-0(k=3)的要求。

4通用技术要求

4.1外观

JJG981-2003

图1测量原理图

标准块材料牌号分别为QKl,K9,F2,ZF2，块体上应清晰标注牌号，无目视可见

的条纹、麻点、开口气泡、破点及破边、霉斑、明显影响测量精度的划痕等缺陷。

4.2维护保养

不得用手接触标准块抛光面，使用完毕后应立即用脱脂棉或脱脂纱布蘸少许无水酒

精与乙醚的混合液擦拭干净，存放在干燥器皿中。

43几何参数

标准块几何形状见图2，其中a,h边长应不小于11mm,G边长应不小于15mmo

标准块建议两面抛光(至少一面抛光一面细磨)，两抛光面夹角a为直角，误差应小于

士1'、

下

|

h

|

图2折射率标准块简图

5计量器具控制

计量器具控制包括:首次检定、后续检定和使用中检验。

5.1检定条件

5.1.1检定设备

5.1.1.1V棱镜折射仪

折射率示值的最小分辨力为1x10-50

5.1.1.2光源

钠灯、氢灯光源，60W普通白炽灯，D谱线、F谱线、C谱线滤光片。

JJ