Method for eliminating wall surface reflection in PIV (Particle Image Velocimetry) experiment

The invention belongs to the technical field of macroscopic PIV experiments, and particularly relates to a method for eliminating wall surface reflection in a PIV experiment. According to the invention, the wavelength of the incident laser is filtered, so that the wavelength of the laser which can only excite the tracer particles is irradiated to the measured flow field, and stray light in the surrounding environment and the like is filtered out; a light source received by the camera is filtered, only fluorescent light emitted by the tracer particles can pass through, light, with other wavelengths, reflected by the wall face of the tested model cannot enter the high-speed camera, and then post-processing is conducted on shot particle pictures through a self-developed image processing algorithm based on a convolutional neural network model; and wall reflection in the particle picture is effectively eliminated, so that a high-contrast pure particle image is obtained. The device can be used for eliminating stron