Circulatory time difference detection method for ultrasonic flow meter

Abstract

The invention discloses a circulatory time difference detection method for an ultrasonic flow meter. A pair of transducers is used as an emission and receiving signal detection group and arranged on the two sides of a pipe to be detected at certain angle. A detection period comprises controlling the two transducers (A&B) to serve as emission ends simultaneously to emit pulse signals of different frequencies; controlling the two transducers to serve as receiving ends, recording time of the signals used from being emitted by the transducer A to reaching the transducer B and time of the signals from being emitted by the transducer B to reaching the transducer A respectively, calculating time differences, performing calculation for N times continuously, calculating an average time difference (k=1,...,N-n) by taking the time differences from the kth time to the (k+n)th time, and calculating the flow speed and the flow by combining geometrical information. Compared with a traditional time difference method, the detection method has the advantages that the requirement of the time-difference method ultrasonic flow meter for high measuring accuracy can be met on the basis of reduction of the equipment number.

Description

technical field [0001] The invention relates to ultrasonic flowmeter technology, in particular to a cycle time difference detection method for ultrasonic flowmeters. Background technique [0002] Compared with mechanical flowmeters and electromagnetic flowmeters, ultrasonic flowmeters have the following advantages: high measurement accuracy, strong adaptability to pipe diameter, non-contact measurement, convenient use, and easy digital management. With the development of piezoelectric ceramic technology, electronic technology and high-speed digital signal processing technology, the performance of ultrasonic flowmeter has been greatly improved, and the manufacturing cost has also been greatly reduced. Therefore, ultrasonic flowmeter has been widely used in the industrial field and daily life. widely used. [0003] At present, the time difference method is mostly used in the design of ultrasonic flowmeters for signal detection. The following is a brief introduction to the det...

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Problems solved by technology

[0025] Method 1 to measure a time difference value requires ultrasonic waves to travel back and forth in the target fluid. If the flow velocity of the target fluid is uneven and changes frequently, the real-time performance of the time difference value measured by method 1 will be affected, thus The calculated flow rate will have a certain error, and the final calculated flow accuracy is limited

[0026] The second method uses two pairs of ultrasonic transducers to measure, although this can shorten the time to measure a time difference value, but it increases the complexity of the control and detection circuits, and at the same time increases the power consumption of the entire flowmeter. In practical applications Medium power consumption is also an important indicator that must be considered in the design

[0027] In practical applications, manufacturing cost is an important criterion to measure the quality of a design. The second method uses two pairs of transducers, and the complexity of the control and detection circuits is very high. While increasing power consumption, it also increases manufacturing costs.

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