Low-cost and high-precision PIV (particle image velocimetry) measuring device and measuring method thereof

The invention provides a low-cost and high-precision PIV (particle image velocimetry) measuring device and a measuring method thereof. The device comprises a USB3.0 industrial camera and a laser engraving device, the front end of the laser engraving device is provided with a light path deformation lens group for converting laser from a point light source to a sheet light source, and the light path deformation lens group comprises a collimating lens located on the light source incident side of the laser engraving device and a Powell prism enabling the light source to be emitted in a fan shape. The laser carving device light source penetrates through the circle center and the focus of the collimating lens. According to the measuring method, the device is used for measuring the flow field. According to the device, the thickness and the divergence angle of the sheet light source can be adjusted through the combination of the collimating lens and the Powell prism, optimal matching of the light path, the tracer par