Device and method for measuring flow rate of fluid
A technology of fluid flow rate and measuring device, which is applied in the direction of fluid velocity measurement, measuring device, velocity/acceleration/impact measurement, etc. It can solve the problems of low applicability and low sensitivity, and achieve real-time measurement, high sensitivity, and simple system structure. Effect
Inactive Publication Date: 2013-04-24
ZHEJIANG UNIV
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Problems solved by technology
The traditional beam shifting method relies on the pointing characteristics of the ultrasonic transmitter, and has low sensitivity and little applicability at low flow rates
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Embodiment
[0058] Using the measuring device and method, using 200±2kHz ultrasonic waves, adopting a double generator interference source configuration, using a standard wind field to determine a standard curve, and measuring the air velocity at 22°C. Sampling the output voltage every 100ms, continuous sampling for 10s. The wind speed is within the range of 0-3m / s, and the measurement error of 5 wind speeds is less than 0.1m / s, and the standard deviation of each group of data is less than 0.05m / s. The wind speed is in the range of 3-15m / s, 10 wind speeds are measured, the relative measurement error is within 1%, and the standard deviation of each set of data is less than 0.05m / s.
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The invention discloses a device for measuring the flow rate of fluid and a method for measuring the flow rate of the fluid. The device for measuring the flow rate of the fluid comprises a voltage signal source, an ultrasound interference source, an ultrasound receiver, an amplifier and a voltage measuring device, wherein the voltage signal source is connected with the ultrasound interference source; the ultrasound receiver, the amplifier and the voltage measuring device are sequentially connected; the ultrasound interference source and the ultrasound receiver are respectively arranged on two sides of the fluid to be measured; and the flow direction of the fluid to be measured is perpendicular to the direction of a connecting line between the ultrasound interference source and the ultrasound receiver. The ultrasound interference source is utilized to generate interference strength at the position of the ultrasound receiver; when the fluid flows between the ultrasound interference source and the ultrasound receiver, the voltage measuring device is used for measuring voltage to obtain a voltage value; and then the voltage value is put into a formula for calculating or a determined standard curve through standard flow field calibration, and lastly, the flow rate of the fluid is obtained through calculation. The device for measuring the flow rate of the fluid and the method for measuring the flow rate of the fluid can realize continuous measurement of the flow rate of the fluid, are high in sensitivity when the flow rate is low, have a simple system and cannot influence the flow of the fluid in a measuring process.
Description
technical field [0001] The invention relates to a fluid velocity measuring device and method. Background technique [0002] The current flow velocity measurement method based on ultrasonic arrival time difference (frequency difference, phase difference), including wind speed and flow measurement, requires accurate measurement of time due to the high speed of sound in the medium. However, due to the time drift of the electronic components of the instrument, the accuracy is limited when the flow rate is small, and the circuit system is relatively complicated. Moreover, the round-trip flight time of ultrasonic waves needs to be measured separately, and continuous measurement cannot be realized. In the existing ultrasonic anemometer, the probe is located in the center of the measured air duct, which will affect the flow of wind. [0003] The Doppler method is suitable for fluids containing impurities or air bubbles, not for clean fluids. The traditional beam shifting method r...
Claims
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IPC IPC(8): G01P5/24
Inventor 杜竞杉陈水桥
Owner ZHEJIANG UNIV
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