Non-intrusive pipeline liquid pressure measuring method based on ultrasonic longitudinal wave reflection technology

Abstract

The invention discloses a non-intrusive pipeline liquid pressure measuring method based on an ultrasonic longitudinal wave reflection technology. According to the method, the pressure value of the liquid in the pipeline is indirectly measured by utilizing different sound velocities of the liquid in the pipe wall under different pressures and temperatures; measurement errors caused by installation of an ultrasonic transducer, a coupling agent and circuit delay are eliminated through the longitudinal wave reflection time of ultrasound in the pipe wall, accurate measurement of the transmission time of liquid in the pipeline is achieved, and a mathematical model of the transmission time of the liquid in the pipeline, the liquid temperature and the pressure value of the liquid in the pipeline is established. The measuring device adopts a circuit design structure which takes an MS1030 time digital conversion chip as a main part and takes high-speed ADC data acquisition as an auxiliary part to carry out ultrasonic transmission time measurement, takes a microprocessor as a core, controls ultrasonic signal sending and receiving time and temperature measurement, converts the time into a pressure value through corresponding mathematical calculation, and displays the pressure value. The problem of non-intrusive pressure measurement required by special occasions is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of pressure measurement calibration, and in particular relates to a non-intervention pipeline liquid pressure measurement method based on ultrasonic longitudinal wave reflection technology. Background technique [0002] The pressure vessel type refers to a closed device that holds gas or liquid and carries a certain pressure. With the development of economy and social progress, pressure vessels have been deeply integrated into people's production and life, such as various process and reaction equipment in metallurgy and pharmaceutical industries; boilers and gas liquefaction facilities in the field of electric power and energy; Reactor force shell; pressure cooker, liquefied gas tank, etc. in daily life. Generally speaking, pressure vessels are installed in harsh environments such as high pressure and high temperature, and the media they carry are mostly flammable, explosive and highly corrosive substances....

AI Technical Summary

Problems solved by technology

Interventional pressure measurement is widely used because of its reliability, high precision, and low price, but it has the following disadvantages: 1) Stress concentration is easy to occur at the opening, and the peak value of stress can reach 3 to 6 times the stress of the film, reducing the service life of the container

2) It is not convenient to add additional test points

3) Most pressure vessels do not allow openings

Although the two-wave reference measurement method can reduce the influence of temperature, it cannot completely eliminate it, and requires multiple ultrasonic transducers, and the measurement device is complicated

The modeling method based on multi-wave fusion synthesizes the information of each waveform and greatly improves the measurement accuracy, but the coupling agent, the installation of the transducer, the starting vibration of the transducer and other working characteristics, ultrasonic excitation and receiving circuits etc. will have a greater impact on the ultrasonic transit time

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