A device for calibrating speed measurement accuracy of Doppler current meter

Abstract

The invention provides a device for calibrating the velocity measurement accuracy of a Doppler current meter, which includes a vertical tube, a circular tube, a film, a locking ring, a grid, a suction tube, a peristaltic pump, an outlet tube, a control circuit, a bracket, and a vertical tube Through the upper part of the working section of the vertical circulating water tank, the round tube is located at the side of the vertical tube, the membrane is located at the front of the circular tube, the locking ring is located at the outside of the membrane, the grille is located at the outside of the vertical tube, and the suction tube is located at the side of the membrane At the front, one end of the peristaltic pump is connected to the suction pipe, the other end of the peristaltic pump is connected to the outlet pipe, the control circuit is connected to the power switch of the peristaltic pump, and the bracket is located inside the vertical pipe; the device for calibrating the velocity measurement accuracy of the Doppler current meter, Use the film to isolate the impact of the water flow on the Doppler current meter, use the active suction technology to reduce the high pulsating pressure at the front of the film, and solve the vibration caused by the Doppler current meter being subjected to fluid pulsating pressure and fluid separation during the test Effect problem, improve the speed measurement and calibration accuracy of Doppler current meter.

Description

technical field [0001] The invention relates to a device for calibrating the velocity measurement accuracy of a Doppler current meter, which belongs to the field of acoustic measurement. Background technique [0002] In recent years, with the implementation of the ocean strategy, more and more attention has been paid to the calibration of ocean instrument performance. In 2016, the Ministry of Science and Technology approved the project "Research on Key Measurement Standards and Traceability Technology for Ocean Acoustic Detection" (Approval Number: 2016YFF0200900). One of the subjects under this project is to establish an accurate calibration of Doppler ocean currents in the laboratory. A device for measuring speed accuracy. The basic design idea is to place a Doppler current meter in the working section of the vertical circulating tank, and use the flow velocity measured by the laser Doppler velocimeter to calibrate the flow velocity measured by the Doppler current meter. ...

AI Technical Summary

Problems solved by technology

Under the excitation of this shedding vortex, the Doppler current meter itself will vibrate, which will cause the detection area of ​​the acoustic wave probe to be unable to focus on a specific position, and will also cause the flow velocity output of the Doppler current meter to be unstable.

This is also one of the reasons why the flow velocity value cannot be stabilized in the process of using the Doppler sea current meter to measure the flow velocity in the field

[0005] Third, in the process of measuring the flow velocity, the Doppler current meter will also be affected by the jitter caused by the flow excitation of the steel cables and cables connected to it, which will also cause a small output of the Doppler current meter. amplitude fluctuation

[0009] To sum up, there is currently no device suitable for calibrating the speed measurement accuracy of Doppler current meters in vertical circulating water tanks.

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