科氏质量流量计中全数字驱动技术

针对全数字驱动技术流量管难以启振的问题,综述了模拟转数字启振、随机波启振、正弦波启振、扫频方波启振、正负阶跃交替启振等5种启振方法;针对驱动信号幅值、频率、相位难以调节的问题,提出了解决方法;针对全数字驱动技术的实现平台,综述了2种解决方案:基于DSP的单核全数字驱动和基于DSP+FPGA的双核全数字驱动。其中,基于DSP的单核全数字驱动成本低,易于推广;基于DSP+FPGA的双核全数字驱动精度更高。

All-Digital Drive Technology in Coriolis Mass Flowmeter

Aiming at the problem that the all-digital driving technology flow tube is difficult to start vibration, five kinds of starting methods such as analog to digital start-up, random wave start-up, sine wave start-up, sweep frequency square wave start-up, and positive-negative step alternate start-up are reviewed. Aiming at the problem that the amplitude, frequency and phase of driving signal are difficult to adjust, the solution is proposed. For the implementation platform of all-digital drive technology, two solutions are summarized: a single-core all-digital drive based on DSP and a dual-core all-digital drive based on DSP+FPGA. Among them, the single-core all-digital driving based on DSP has low cost and is easy to promote, and the dual-core all-digital driving based on DSP+FPGA has higher precision.