Device for recording air velocity field information and method thereof

Abstract

The invention provides a device for recording air velocity field information and a method thereof. The device comprises a light source system, a bubble generator, a synchronization controller and at least two color cameras. The light source system comprises continuous light sources and pulse light sequence light sources which irradiate according to a preset pulse flashing interval and the pulse color change order. The continuous light sources provide lighting for a test area. The pulse light sequence light sources provide pulse light irradiation for the test area. The bubble generator discharges tracing bubbles of neutral buoyancy to the air of the test area. The color cameras synchronously acquire color images recording the moving tracks of the tracing bubbles. The synchronization controller realizes synchronization of the pulse light sequence light sources and the color cameras, wherein the exposure time of the color cameras is greater than the preset pulse flashing interval of the pulse light sequence light sources. The requirements for the test environment and camera configuration are low so that the accuracy of the measurement result can be guaranteed and the design cost can be reduced.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a device and method for recording air velocity field information based on pulsed light sequences. Background technique [0002] Air flow is a very important way for the diffusion of pollutants and the transmission of heat. The thermal environment and the concentration distribution of pollutants will be significantly different under different air flow forms. Therefore, the grasp of the law of air flow and the measurement of air flow under different conditions have become the basis of research in related fields and are of great significance. [0003] Existing technical means for measuring airflow velocity include particle tracking velocimetry method, releasing tracer particles in the air, using a high-speed camera to continuously record the position information of the bubble point at the transient moment, and then calculating its trajectory and velocity; particle trajectory veloci...

AI Technical Summary

Problems solved by technology

[0005] The particle tracking velocimetry method needs to take a large number of photos of bubble positions at transient time points. The time interval between the photos is small, so that the displacement of the corresponding bubbles between the two photos is as small as possible, so as to facilitate the connection of the bubble positions at different time points. Together, the reconstruction of the bubble trajectory is completed. In order to improve the accuracy, the reconstruction results of the previous few time points are usually used for fitting, and the position of the object at the next moment is estimated, and the measurement results are not accurate.

[0006] Particle track speed measurement method, this scheme needs to keep the shutter open for a long time, the measurement frequency is low, it is difficult to judge the direction of particle movement, and the measurement accuracy is poor

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