核燃料后处理工艺中需经常测量铀和硝酸的浓度。目前,主要采用人工定时取样、化验室化验分析的方法。这种方法准确度较高,但是分析的间隔时间较长。铀和硝酸浓度的波动情况不能及时掌握和控制,对指导生产十分不利。故特别需要一种自动、快速的测量方法,以便实现工艺生产自动化和远距离控制。核燃料后处理工艺中测量UO2(NO3)2和HNO3的浓度,通常采用密度-电导法, The concentrations of uranium and nitric acid are often measured in nuclear fuel reprocessing processes. At present, the main method of artificial sampling, laboratory laboratory analysis. This method is more accurate, but analyzes take longer. Uranium and nitric acid concentration fluctuations can not be timely grasp and control, to guide the production is very negative. There is a particular need for an automated and rapid measurement method for automation of process production and remote control. Measurement of concentrations of UO2 (NO3) 2 and HNO3 in nuclear fuel reprocessing processes is usually performed using density-conductivity methods,