流体多参数超声波测量仪设计

Design of Multi-Parameter Ultrasonic Measuring Instrument for Fluid

针对目前流体检测仪测量参数单一的问题,提出了一种用超声波技术测量流体多参数的方法。当传播距离不变时,利用超声波在流体中的传播速度间接得到流体的体积流量、密度、质量流量。由于流体流量、密度等参数均受温度影响,故设计过程中以温度信号作为参考信号,对所求参数进行实时补偿。同时,测量仪以FPGA为控制核心,实现高速信号采集与处理,以软件插补算法实现超声波传播时间的精密计算,使测量结果更加稳定可靠。

In order to solve the problem of single measurement parameters of fluid tester,a method of measuring fluid multiparameter by ultrasonic technique is proposed.When the propagation distance is constant,the volume flow,density,and mass flow of the fluid are obtained indirectly by using the propagation speed of ultrasonic waves in the fluid.Because the parameters such as fluid flow and density are affected by the temperature,the temperature signal is used as the reference signal in the design to compensate the parameters in real time.At the same time,using FPGA as the control core to achieve high-speed signal acquisition and processing,and using software interpolation algorithm to accurately realize the precise calculation of ultrasonic propagation time,the measurement results can be more stable and reliable.