Micro velocity measuring system of micro flow field particle image

Abstract

The invention discloses a micro flow field particle image microscope speed trial system. It is made up of frame-spanning CCD camera, imaging lens group, long filter, 45 degrees of laser reflecting prism, microscope lens with long working distance and high numerical aperture radius, double-pulse laser, reflector, control and image processing computer, signal synchronizer. It uses microscope to control the thickness and position of the imaging plane, and it uses whole field lightening mode to replace the traditional particle image speed trial lamp house, and uses fluorescence with micron grade to nanometer grade, and induces the laser from side surface with 40 degrees of laser reflecting prism, avoids the damage to CCD camera by laser, at the same time, it uses fluorescence filtering method, upgrades the signal-to-noise of image. The device can carry on precise detection to the micron grade flow field.

Description

technical field [0001] The invention relates to a flow field detection system, in particular to a microscopic flow field particle image microvelocity measurement system. Background technique [0002] Particle Image Velocimetry (PIV) is a full flow field multi-point measurement technology developed from the solid mechanics speckle method in the late 1970s. This technology breaks through the limitation of traditional single-point measurement, and can instantaneously and non-contactly measure the velocity distribution of the two-dimensional plane in the flow direction in the flow field, and has high precision. The basic principle is: evenly spread tracer particles in the flow field, and use a pulsed laser sheet light source to incident into the measured flow field area, and record the particle image on the PIV negative film or by CCD through two or more consecutive exposures. The camera gets a digital image. Two-dimensional velocity distribution is obtained by Young's fringe ...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the microscopic shooting problem in the microscopic fluid particle image velocimetry technology, the purpose of the present invention is to provide a microscopic flow field particle image microscopic velocimetry system

The special optical path system design is adopted to solve the screening of illumination laser and excited fluorescence, and the high numerical aperture objective lens is used to solve the problem of plane shooting, so as to realize the microscopic plane detection of the microscopic flow field by laser-induced fluorescence.

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