基于静力称重法的玻璃浮计校准方法研究

采用单晶硅环作为参考标准固体密度,以密度稳定、表面张力低的正十三烷为标准工作液体,选用CCD图像测量系统进行玻璃浮计刻度和液面位置的对准,设计了玻璃浮计校准系统。根据空气中和液体中两次玻璃浮计称重测量值可以计算出当前刻度对应的修正值。对密度测量范围为770~790kg/m³,最小分度为0.2kg/m³的玻璃浮计进行了测量,并与德国国家物理技术研究院进行了双边比对,验证了玻璃浮计校准系统的有效性。

Study of Glass Hydrometer Calibration by Hydrostatic Weighting

Glass hydrometers calibration uses silicon ring as a reference standard solid density, tri-tretradecane with density stability and low surface tension as the standard working liquid, CCD image measurement system to align the scale of hydrometer and liquid surface, designes a glass hydrometer calibration system.According to twice glass hydrometer weighing in the air and liquid can calculate the correction value of the current scale.To measure the density range of 770~790 kg/m3, a resolution of 0.2 kg/m3 of hydrometer is used.The results of measurement comparing with that of the Physikalisch-Technische Bundesanstalt,verify the validity of the calibration system.