Ultrasonic flux detection system and detection method

Abstract

The invention belongs to the detection field, and relates to an ultrasonic wave flow rate detecting system and a detecting method, in particular to a high-precision fluid flow rate ultrasonic wave detecting system and a detecting method. The ultrasonic wave flow rate detecting system includes a system control part, a circuit part and an auxiliary device. The ultrasonic wave flow rate detecting method is characterized in that an improved time difference method is adopted for calculating the speed of a fluid; the delay window reception technique is adopted, and the influence of noise on the detection precision during detection is reduced through pulse width detection; and as the resolution of measuring time for the system is further improved through the adoption of the interpolation correlation method and the correlation coefficient judgment method, and reaches 1.25ns, the accuracy and the precision of the ultrasonic flow-meter are remarkably improved. The detecting system provided by the invention has the characteristics of small size, low power consumption, stable and reliable measurement and the like; the precision reaches 0.5; the sensitivity attains 0.3mm / s; and the system is suitable for measuring the flow rates and the flow velocities of various liquids in plastic or metal pipes with diameters being 25mm-8m.

Description

technical field [0001] The invention belongs to the detection field, and relates to an ultrasonic flow detection system and a detection method, in particular to a high-precision fluid flow ultrasonic detection system and a detection method. Background technique [0002] In metallurgical, petroleum, chemical, electric power and other industrial enterprises, as well as urban water supply, drainage, and environmental protection departments, it is necessary to accurately measure fluids such as water, oil, and sewage flowing through pipelines. However, traditional detection methods and flow detection systems or detection devices such as turbines, vortex streets, orifice plates, and electromagnetics all need to install the sensing part in the pipeline, and a section of installation pipe is provided, which is not only inconvenient for installation and maintenance, but also causes fluid leakage. Pressure loss, leakage and other problems, especially for the measurement of toxic, corr...

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Problems solved by technology

[0007] In order to solve the problems existing in the prior art, the calculation of the flow velocity during the detection process contains the sound velocity C, which is greatly affected by the temperature, thereby affecting the accuracy of the measurement; the receiving door is always open during the detection process, and the outside world All kinds of interference signals are easy to invade, which will affect the stability of the measurement. In ultrasonic flow detection, the requirements for measurement accuracy are very high. The medium flow rate is 1m / s, and the time difference is only tens of nanoseconds. Resolution, technical problems that cannot be realized by existing detection methods, the present invention provides an ultrasonic flow detection system and detection method

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