高精度单浮子磁悬浮密度测量系统研制  

Development of high accurate single-sinker density measurement system based on magnetic suspension balance

作　　者：李会亚[1,2] 公茂琼[1] 郭浩[1,2] 董学强[1] 吴剑峰[1] 

机构地区：[1]中国科学院理化技术研究所低温工程学重点实验室,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《低温工程》2012年第3期1-4,共4页Cryogenics

基　　金：国家自然科学基金项目(No.50890183);中国科学院重大科研项目(No.YZ200739)

摘　　要：研制了一套高精度的流体压力-密度-温度(p,ρ,T)测量系统,其适用温度、压力和密度范围分别为90—290 K,0—3 MPa,0—2 000 kg/m3。该系统基于阿基米德原理,采用单浮子磁选耦合力传递方法,实现密度的高精度测量。该系统的温度、压力测量标准不确定度分别为5 mK、250 Pa(1.5 MPa量程)/390 Pa(3 MPa量程),密度测量最大相对标准不确定度为0.1%。用新研制的密度测量系统,对190—276 K温度区间和0—3 MPa压力区间的甲烷气体密度进行了测量,实验结果与REFPROP密度值有较好的一致性,验证了该系统的可靠性。An accurate fluid pressure-density-temperature measurement system was developed. The temperature, pressure and density range is 90 K to 290 K, 0 to 3 MPa, 0 to 2 000 kg/m^3 respectively. The density measurement system is based on Archimedes＇ buoyancy principle and is a single-sinker system incorporating a magnetic suspension coupling. The standard uncertainty in temperature is 5 mK, and that in pressure is 250 Pa for 1.5 MPa and 390 Pa for 3 MPa full scale range respectively. The maximum relative standard uncertainty is 0.1% in density. In order to verify the new apparatus, comprehensive pressure-den- sity-temperature measurements on pure methane were carried out in the temperature range （190 K to 276 K） and pressure range （0 to 3 MPa）. The experimental data were compared with the value calculated by REFPROP and good agreements were found.

关 键 词：密度 单浮子 磁悬浮天平 甲烷 

分 类 号：TB665[一般工业技术—制冷工程] TB663