Flow rate detection method for low-energy-consumption ultrasonic flow rate meter and system

Abstract

The invention belongs to the technical field of ultrasonic flow rate meter design, and particularly relates to a flow rate detection method for a low-energy-consumption ultrasonic flow rate meter and a system realizing the method. The method comprises the following steps that a main control module generates continuous excitation signals with the period being T and outputs the excitation signals to an excitation signal number control circuit; the excitation signal number control circuit processes the continuous and periodic excitation signals into excitation signals in specific period numbers, and the specific period number is greater than or equal to 6; a first energy converter receives the specific period number of excitation signals and then sends ultrasonic signals; the second energy converter receives the ultrasonic waves and then outputs echo signals to a timing circuit in an echo signal processing module for timing, in addition, the result is output to the main control module, and the main control module calculates the flow rate according to the ultrasonic wave down-flow and reverse-flow output timing difference values. The continuous excitation signals are processed into the specific period number of excitation signals, the first energy converter cannot be always in the work state, the energy loss is reduced, and the service life of the system is prolonged.

Description

Technical field [0001] The invention belongs to the technical field of ultrasonic flow meter design, and particularly relates to a flow detection method and system for a low-energy-consumption ultrasonic flow meter. 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 flow meters are widely used in petroleum, chemical, metallurgy, electric power, water supply and drainage fields. [0003] The measurement principle of the ultrasonic flow meter 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 upstream transducer af...

AI Technical Summary

Problems solved by technology

In the prior art, the excitation signal used to excite the transducer is mostly a continuous signal, but since only the time of downstream or upstream is collected, the part after the continuous signal is basically not used, and the continuous excitation wave signal will cause the transducer The continuous vibration of the energy device leads to excessive energy loss of the system, requiring frequent battery replacement of the ultrasonic flowmeter, which is inconvenient to use

In addition, the continuous excitation signal will also generate interference waveforms on the pipe wall or other parts, which will affect the measurement accuracy of the ultrasonic flowmeter

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