Low-power-consumption and high-precision ultrasonic flow rate measuring method and device

Abstract

The invention discloses an ultrasonic flow rate measuring method and device. In the traditional flow velocity measurement, a measured result needs to be subjected to temperature compensation. In the method disclosed by the invention, the flow rate can be calculated by measuring down-flow propagation time t1, counter-flow propagation time t2 and electronic circuit delay time tr of an ultrasonic wave in fluid. The device disclosed by the invention comprises a first energy transducer, a second energy transducer, a first analog switch, a second analog switch, a third analog switch, a first signalconditioning circuit, a second signal conditioning circuit, an ultrasonic wave transmission timing circuit and a single-chip microcomputer. By means of the invention, the influence of fluid temperature to flow rate measurement is eliminated, the precision of flow rate measurement is improved, and the cost of the device is saved.

Description

technical field [0001] The invention belongs to the technical field of fluid detection, and relates to a method and device for measuring ultrasonic flow with low power consumption and high precision. Background technique [0002] Since the Germans developed the first ultrasonic flowmeter in 1928, the development technology of ultrasonic flowmeter has been continuously improved. Early ultrasonic flowmeters had fatal weaknesses such as low precision, slow response, poor stability and reliability. But in the past 20 years, due to the rapid development of high-speed digital signal processing technology and micro-processing technology and the progress of sensing technology, ultrasonic flowmeter not only overcomes the shortcomings of the past, but also has high precision, high anti-interference, and non-contact measurement. The advantages of changing the fluid flow field, easy operation, and low cost have been favored by more and more people in the industry. The development pros...

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Problems solved by technology

[0004] However, the ultrasonic sound velocity in the fluid is greatly affected by the temperature. In the measurement of the flow velocity of the fluid, temperature compensation is required for the measurement results. However, the traditional temperature compensation method has the disadvantages of large error and low repeatability, and uses a higher voltage to drive the sensor. As a result, the power consumption of the device increases and it is difficult to meet the requirements of the site

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