The Study Of High Precision Pipeline Fluid Temperature Rapid Measurement Method Based On Ultrasound

Ultrasonic piping fluid temperature measurement with the advantages of non-contact measurement,fast response,wide measurement range,etc.,and it is particularly suitable to measure the temperature of large diameter and high dangerous fluid.An ultrasonic pipeline fluid temperature measurement system based on time difference method is designed by FPGA + STM32 microcontroller hardware circuit structure,improving the the measurement accuracy of ultrasonic propagation time in the media is the key to improve the accuracy of the system measurement.The main research contents are as follows:1.Various ultrasonic temperature measurement methods are studied,especially the time difference method;the propagation characteristics of ultrasonic wave in liquid medium and the working principle of ultrasonic transducer are studied in detail,and the ultrasonic transducer is designed and installed.2.According to the characteristics of the designed ultrasonic transducer,the ultrasonic transducer matching circuit with good performance is designed;the system uses the way of FPGA and single chip working together.FPGA is used as the control chip for transmitting and collecting ultrasonic signals,and Verilog HDL hardware description language and a large number of IP cores are used to design FPGA software;STM32 series microcontroller is used as the control chip of signal processing and man-machine interaction circuit.3.Design the maximum feature wave extraction algorithm and the linear interpolation algorithm for accurate calculation of the end of propagation time,the measurement accuracy of the ultrasonic propagation time reaches the nanosecond level.4.Each functional module is simulated and debugged,and under different experimental platforms,the temperature measurement experiments of static liquid medium and liquid medium in the pipeline were carried out.The error analysis and uncertainty evaluation of the measurement results were carried out.The system meets the design goals of high-precision rapid temperature measurement.