Particle playground measuring device and measuring method based on digital micro-mirror plane structured light illumination

Abstract

The invention provides a particle playground measuring device and a measuring method based on digital micro-mirror plane structured light illumination. The particle playground measuring device is characterized in that parallel light after collimation and beam expanding is reflected by a digital one-dimensional periodic optical grating generated by a DMD (digital mirror device) and forms plane structured light to illuminate a particle playground by sequentially passing through a first cylindrical lens, a filter and a second cylindrical lens, and finally the light is scattered by the particle playground and collected by an image sensor to form an imaging pattern; the DMD and the image sensor are synchronously triggered and controlled by adopting a computer to control a synchronous controller, the digital one-dimensional periodical optical grating is controlled by the DMD to generate the phase shift of 0, 2pi / 3 and 4pi / 3, three patterns with the phase shift of 0, 2pi / 3 and 4pi / 3 are sequentially collected through the image sensor, the collected interference pattern is processed by the computer, and the phase distribution of a to-be-detected object can be acquired. The method and the device have the characteristics of high response speed, stability in phase shift, convenience in use and the like.

Description

technical field [0001] The invention relates to a particle field measurement device, and the invention also relates to a particle field measurement method. Background technique [0002] The laser imaging measurement method is widely used in fuel spray, drug spray, Pesticide spray and other particle field scattering measurement. According to the spatial layout of the light source and detector, laser imaging measurement methods can be divided into forward, backward or side scatter measurement, and the most popular side scatter measurement method is planar laser imaging. After more than 30 years of development, the most common planar laser imaging techniques include particle image velocimetry (PIV, Particle Image Velocimetry), particle tracking velocimetry (PTV, Particle Tracking Velocimetry) and planar laser-induced fluorescence (PLIF, Planar Laser Induce Fluorescence). ), etc. Although these techniques utilize different scattering properties of light and instrumental method...

AI Technical Summary

Problems solved by technology

However, limited by the phase shifting speed of the rotary phase shifter, this method can only be used for low-speed measurement, and because of the non-linearity of the rotation of the rotary phase shifter, it is easy to cause the instability of the phase shift of the system, requiring very cumbersome calibration

Images