Flow measuring and calculating method based on temperature compensation
A technology of temperature compensation and flow, which is applied in the direction of measuring flow/mass flow, liquid/fluid solid measurement, volume change compensation/correction device, etc., to achieve fast response, accurate measurement, and good real-time performance
Inactive Publication Date: 2021-06-15
山东锋士信息技术有限公司
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[0006] In order to make up for the deficiencies of the prior art, solve the deficiencies of the prior art, and solve the problem of ultrasonic water meters measuring the temperature of the medium, the present invention provides a flow measurement and calculation method based on temperature compensation
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Embodiment 1
[0046] It should be noted that the flow calculation method based on temperature compensation of the present invention is applied to the existing ultrasonic water meter. In this embodiment, the basic structural block diagram of the ultrasonic water meter used is as follows figure 2 shown. Among them, STM32L073V8T6 is a single-chip microcomputer, and TDC-GP22 is a time test chip.
[0047] Such as figure 1 As shown, a flow calculation method based on temperature compensation:
[0048] 1) The actual propagation distance of ultrasonic waves measured in still water
[0049] ① First, let the water flow fully in the ultrasonic pipe section. After the temperature is stable, close the valve of the flow verification device. Under the static water state, measure the upstream propagation time t of the ultrasonic wave from the upstream ultrasonic transducer to the downstream ultrasonic transducer in the pipe. u静 and the downstream propagation time t from the downstream ultrasonic transduc...
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The invention discloses a flow measuring and calculating method based on temperature compensation, and belongs to the technical field of ultrasonic water meters. The actual propagation distance of the ultrasonic waves is calculated according to the propagation time of the ultrasonic waves and the propagation speed of the ultrasonic waves in water at the temperature in a still water state; and then the ultrasonic wave propagation speed at the temperature is obtained by measuring the propagation time of the ultrasonic wave between the two transducers at any water temperature and the measured actual propagation distance, then the actual temperature of the fluid is obtained through calculation according to the relation between the ultrasonic wave propagation speed and the water temperature, and then temperature compensation is conducted. According to the method, on the basis that the hardware cost is not increased, accurate measurement of the water temperature is achieved through the actual propagation distance and propagation time of the ultrasonic waves in the still water state; and the method is simple in structure, high in temperature change response speed, good in real-time performance, capable of accurately measuring the temperature of water at the meter end and conducting temperature compensation, and high in measuring precision.
Description
technical field [0001] The invention relates to the technical field of ultrasonic water meters, in particular to a flow measurement and calculation method based on temperature compensation. Background technique [0002] As a tool for measuring water use, water meters are widely used in various places where water is used, such as domestic water, industrial water, and agricultural water. However, mechanical water meters are commonly used, and mechanical water meters are limited, so they cannot be widely used. Applied in various environments. So people designed ultrasonic water meters, which have the advantages of wide range and strong application environment. [0003] At present, most ultrasonic water meters are based on the principle of ultrasonic time difference. By detecting the time difference generated when the ultrasonic sound beam propagates downstream / countercurrently in the fluid in the measurement tube, the flow velocity of the fluid is analyzed and the flow rate of...
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IPC IPC(8): G01F1/66G01F15/02
CPCG01F1/66G01F15/02
Inventor 孙启玉刘玉峰张永忠李红超伊西锋
Owner 山东锋士信息技术有限公司