Flow detection method and system for high-precision ultrasonic flow meter
A flow detection and ultrasonic technology, applied in the field of ultrasonic flow meter design, can solve problems such as poor time measurement accuracy, inaccurate flow meter measurement results, and difficult to determine, and achieve the effect of improving measurement accuracy
Active Publication Date: 2015-01-28
姜跃炜
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Problems solved by technology
There are many deficiencies in this timing method: 1. The measurement accuracy depends on the crystal oscillation frequency ν of the counting circuit, where ν=1 / T; 2. Since the starting point of the echo signal received by the transducer has interference, it is not easy to determine , leading to inaccurate time measurement
Especially when the flow rate is small, that is, when the difference between t1 and t2 is small, the measurement accuracy of time is very poor, and the measurement result of the flow meter is very inaccurate
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[0018] Combine below Figure 2 to Figure 8 , the present invention is described in further detail.
[0019] refer to image 3 , a flow detection method for a high-precision ultrasonic flow meter, comprising the following steps: (A) the main control module 10 generates an excitation signal and outputs it to a first transducer; (B) the first transducer receives the excitation signal After the ultrasonic signal is emitted; (C) the second transducer receives the ultrasonic wave and outputs an echo signal to the echo signal processing module 60; (D) the echo signal processing module 60 divides and amplifies the received echo signal ;Such as image 3 As shown, the division is: when the main control module 10 generates the excitation signal or when the first transducer emits ultrasonic waves, the point after an integer number of clock cycles of the main control module 10 is the starting point, and the echo after the starting point Any rising edge or falling edge or peak point of t...
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The invention belongs to the technical field of ultrasonic flow meters and particularly relates to a flow detection method and system for a high-precision ultrasonic flow meter. The method includes producing excitation signals; allowing a first transducer to emit ultrasonic signals; allowing a second transducer to output echo signals after receiving the ultrasonic signals; allowing an echo signal processing module to cut and amplify the echo signals; outputting the cut and amplified pulse signals to a counting circuit of a main control module for counting. The system comprises the main control module, the first and second transducers and the echo signal processing module to execute the steps. The total transmission times of the ultrasonic countercurrent and anti-countercurrent processes are not compared, the countercurrent and anti-countercurrent are compared after removing the oscillation periods of the entire counting circuit in integral numbers, and the measurement precision is equal to the oscillation periods of the counting circuit divided by the magnification and is improved greatly as compared with the current measurement precision.
Description
technical field [0001] The invention belongs to the technical field of ultrasonic flowmeter design, and in particular relates to a flow detection method and system for a high-precision ultrasonic flowmeter. Background technique [0002] Ultrasonic flow meter is a device that uses the principle of ultrasonic time difference to measure the flow of liquid or gas. Compared with traditional mechanical meters, ultrasonic flow meters have low starting flow, high measurement accuracy, and small pressure loss. It is precisely because of these excellent characteristics that ultrasonic flowmeters are widely used in petroleum, chemical industry, metallurgy, electric power, water supply and drainage and other fields. [0003] The measurement principle of the ultrasonic flowmeter is: the upstream transducer sends out an ultrasonic signal, which is received by the downstream transducer after time t1; the downstream transducer sends out an ultrasonic signal, which is received by the upstrea...
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Inventor 姜跃炜
Owner 姜跃炜