Body type light source based measurement and control system for large-area section flow field measurement

Abstract

The invention discloses a body type light source based measurement and control system for large-area section flow field measurement. The measurement and control system comprises a test module, a central control module and a terminal control module; according to the invention, by adopting a body type light source to illuminate, a single-light-source illuminating area is increased, and bad influence of overlapping of multiple light sources on overall measurement is avoided; the measurement and control system disclosed by the invention applies depths of field of cameras and a specific focused image implemented by multi-camera post-processing synthesis to implement measurement on a specific section flow field, and compared to a conventional particle image speed measurement system, ensures measurement accuracy when implementing large-area measurement; the system can implement high-speed large-area section flow field measurement by connection of a synchronizer and a control system, and the system is simple in optical structure and convenient to arrange and apply; and by multi-camera synchronous acquisition and setting of exposure signals, large-area particle image acquisition can be implemented, and even high-speed fluid motion also can be measured by adopting a low-speed industrial camera.

Description

technical field [0001] The invention relates to the technical field of flow field measurement, in particular to a measurement and control system for large-area section flow field measurement based on a body light source. Background technique [0002] For the measurement of fluid, ocean, and water conservancy project cross-section flow fields, the commonly used measurement technology is particle image velocimetry technology, but limited by physical limitations such as image resolution, laser light source power, and spread angle, it is impossible to conduct large-area flow fields. Measurement. In actual marine engineering, hydraulic engineering research and engineering fluid measurement, many large waves, tidal currents, wind wave currents, and slope-changing flumes require high-precision flow field measurement of cross-sectional water bodies with a length of more than 1m. For the above-mentioned large-area cross-sectional flow field measurement, the conventional solution is ...

AI Technical Summary

Problems solved by technology

[0004] 1. Due to the problem of the fan-shaped angle of the light source, there will be overlapping parts at the splicing part of the light source, and the light intensity of the overlapping part is twice that of other parts, and the calculation of the flow field at the joint will be greatly affected;

[0005] 2. The splicing of multiple sets of light sources is also very difficult, which consumes precious experimental time and is easy to introduce errors;

[0006] 3. In addition, the cost of multiple sets of particle image velocimetry systems is very high, and multiple sets of hardware synchronization and post-processing are very time-consuming;

[0007] 4. For high-speed and large-area flow field measurement, the large-scale pulse laser used is large in size, cumbersome to adjust, and expensive;

[0008] 5. In large-scale sea areas relative to large-area smooth measurements, the measurement position of the test device used is very easy to change due to ocean currents, which will lead to inaccurate measurement orientation and even serious measurement distortion

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