Flow velocity measurement method applied to radar wave flow velocity meter and radar wave flow velocity meter

Abstract

The invention provides a radar wave flow velocity meter and a flow velocity measurement method applied to the radar wave flow velocity meter. A corrected electromagnetic wavelength is obtained throughcarrying out calculation according to a height, a temperature and air pressure of a position where the radar wave flow velocity meter is located, and the corrected electromagnetic wavelength is utilized to carry out flow velocity calculation, so that the flow velocity calculation correctness is improved. Furthermore, vibration interference signals in electromagnetic wave reception signals are filtered, so that the Doppler frequency value calculation correctness is improved and then the flow velocity calculation correctness is improved. By utilizing a related Fourier transform algorithm, high-precision Doppler frequency values can be calculated under limited sampling point data, so that the flow velocity calculation result can be accurate to 0.1 mm/s.

Description

Technical field [0001] The invention relates to the technical field of flow meters, and more specifically, to a flow rate measurement method applied to a radar wave flow meter and a radar wave flow meter. Background technique [0002] Currently, the measurement of river flow velocity usually uses a flow meter. The flow meter is mainly divided into four types: mechanical, electrical, ultrasonic and radar wave. Mechanical, electrical and ultrasonic are contact measurement methods. Radar waves are non-contact measurement. The radar wave velocity meter is based on the Doppler principle to measure the water flow velocity. When the electromagnetic wave emitted by the radar wave velocity meter illuminates the flowing water surface, the receiving frequency of the radar will change due to the Doppler effect. When the direction of the velocity of the water surface coincides with the direction of the electromagnetic wave, the received frequency increases. When the direction of surface ...

AI Technical Summary

Problems solved by technology

[0004] (1) The vibration of the radar wave current meter itself affects the measurement accuracy

For example, radar current meters installed under bridge decks are highly susceptible to vibrations from passing vehicles

The frequency generated by the vibration can easily affect the receiving frequency of electromagnetic waves, thereby affecting the measurement accuracy of the radar wave velocity meter

The radar current meter installed on the crossbar of the river bank is affected by the strong wind and vibrates, which is more likely to affect the receiving frequency of electromagnetic waves

[0005] (2) Weather factors affect the measurement accuracy of the radar current meter

For example, weather such as strong winds and rainstorms will have a certain impact on the emission and reception of electromagnetic waves, which in turn will affect the measurement accuracy of the radar wave velocity meter

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