核子秤二次仪表的研制

Development of secondary Instrument for Nuclear Scale

介绍一种以AT89C52单片机为核心的核子称二次仪表的软、硬件设计。根据射线穿过物料后强度衰减的原理,通过测定传输带速度和穿透物料的γ射线强度,进行传输带上物料的非接触、在线称量和控制。采用插值法计算常用对数,用平均、平滑和限幅等数字滤波器消除射线强度统计涨落的影响,获得了满意的计算精度、重复性和响应速度。该仪表支持28项系统参数的设置,并具有模拟信号输出、打印机以及RS-232数据通讯接口,极大改善了其适应性。

This paper intriduced a design of software and hardware of the secondary instrument with nuclear scale based AT89C52 microcontroller.According to the principle that the radial intensity will attenuate when ray penetrates material,the system is developed to weigh and control the quantity of material on the conveyor belt on line by measuring the velocity of belt and the radition intensity of γ ray transmitted.The interpolation method is used to calculate common logarithm,meanwhile the digital filters of averaging,smoothing and limiting are applied to eliminate the influence of raediation statistical fluctuations,satisfying the requirement of the calculation precision,repeatability and response speed.