全数字标准液体压力校准系统的实现

压力仪表是工业生产过程中不可缺少的测量设备,对压力仪表的校准是保证其测量精度的必要手段,标准压力校准系统是校准过程的重要设备.全数字标准液体压力校准系统以数字信号处理技术为核心,借助数字信号处理器(digital signal processor,DSP)的强大运算能力和现场可编程门阵列(field programmable gate array,FPGA)的控制能力,实现了标准液体压力校准系统的精确控制.控制过程采用增量式PID算法,并利用积分分离技术实现了低超调的压力控制.实验结果表明:液体压力控制过程无明显超调,液体压力控制精度达到±0.02%的设计要求.

Realization of Full Digital Standard Liquid Pressure Calibration System

The pressure instrument is an indispensable measuring equipment in the industrial processes,which is calibrated as the vital means to ensure its accuracy of measurement,in order to realize its accuracy control,the standard pressure calibration system is an essential instrument in the calibration process.The full digital standard pressure calibration system regarded the digital signal processing technology as its core area,also used the great operational capability of the digital signal processor(DSP)and the control ability of the field programmable gate array(FPGA).The control process adopted the PID arithmetic with increment,and the integral separation technology was applied to implement the low overshoot pressure control.The experimental results show that the fluid pressure control process has no obvious overshoots,the precision of the fluid pressure control is achieved as the design requirement of ±0.02%.