Full-domain flood water level real-time monitoring method based on fringe projection structured light

Abstract

The invention discloses a full-domain flood water level real-time monitoring method based on fringe projection structured light, which relates to the technical field of water level measurement, and comprises the following steps: S1, preparing a water tank, a CCD camera and a projector, pasting black films on the bottom surface and the side surface of the water tank, arranging a gate at the middle upstream of the water tank, and using a CCD camera for capturing stripe pattern pictures of the water surface in the water tank changing from dynamic state to stable state; and S2, opening the water tank gate, selecting a stripe pattern picture at any moment after the water tank gate is opened, performing Fourier transform profilometry processing on the stripe pattern picture at any moment to obtain a truncation phase difference corresponding to the water surface at the corresponding moment, and determining the global water surface height h (x, y) at any moment through the truncation phase difference and a phase height mapping formula. Through the design, real-time monitoring of the global flood water level is completed.

Description

technical field [0001] The invention relates to the technical field of water level measurement, in particular to a method for real-time monitoring of global flood water level based on fringe projection structured light. Background technique [0002] At present, there are mainly two methods for flood level measurement: immersion measurement and non-immersion measurement. Commonly used immersion measurements include artificial physical sounding methods, pressure sounding techniques, etc., such as capacitive-resistive wave height meters, plumb bobs, scales, and buoys. Among them, manual measurement methods such as plumb weights, scales, etc. have poor measurement accuracy, and it is difficult to measure large flow rates, large water depth changes, and unstable riverbeds; buoy measurement methods have risks such as loss and sinking; capacitance-resistive wave height meters are often used only The water depth data of a single point can be obtained, and the water surface will be ...

AI Technical Summary

Problems solved by technology

Among them, sonar sounding technology and laser sounding technology can measure the water level of the whole area, while GPS sounding technology can only measure the water level of the band, but cannot measure the water level of the whole area. Its measurement accuracy depends on the GPS accuracy, and the general accuracy is not very high.

Compared with immersion measurement, non-immersion measurement generally requires a complete system to operate, has higher requirements for devices, and the real-time performance of non-immersion water level measurement is poor

Although the current measurement technology is developing rapidly, and the accuracy and speed have been greatly improved, the monitoring of flood water level is mostly point measurement or strip measurement, it is difficult to measure the real-time water level data of the whole area, and some measurement The method needs to insert tools such as probes and measuring sticks into the water, which has certain requirements for the minimum water depth, and will cause disturbance of the water flow, which is a serious waste of manpower and material resources.

[0004] The purpose of the present invention is to address the deficiencies of the prior art, to provide a method for real-time monitoring of the global flood water level based on fringe projection structured light, and to solve the problem that the existing measurement method can only be point-based , The limitation of band-shaped water level measurement, realize the whole-area water level measurement, improve the real-time performance and accuracy of water level measurement, provide support for in-depth research on flood evolution laws, reduce the waste of manpower and material resources, and improve the measurement speed

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