压缩天然气(CNG)加气柱检定系统研究

Research on Compressed Natural Gas( CNG) Plus Column Verification System

以DSP(TMS320F28335)芯片为核心,采用高精度A/D对传感器的输出信号进行实时采集,结合现代信号处理算法,精确计算出相位差和频率,利用DSP快速运算功能,算出被测流体的密度和质量流量等信息,并在上位机上采用delphi语言开发用户界面,解决了大流量、高压力下信号的实时采集和流量变化幅度较大等难题。实验结果表明:该系统有效提高了系统的稳定性和测量准确度,大大缩短了系统的响应时间。

The DSP chip （TMS320F28335 ） is used as the core, and the real-time acquisition of the output signal of sensors is realized with the high-precision A/D converter. Combined with the modern signal processing algorithm, the phase difference and frequency can be calcu-lated accurately. With the fast operation function of the DSP chip, the information of the flow body such as the density and mass flow rate can also be calculated, which can also be displayed on the PC interface compiled with the Delphi language. The problems such as the real-time acquisition and great changes in flow under big flow and high pressure are solved in the system. Experimental results show that the response time of the sys-tem is shortened and the stability measurement accuracy of the system are enhanced effectively.