Exploring The Test Method To Transparent Medium’s Surface Morphology

Surface morphology is the effect of processing the surface quality and the functional characteristics of important factor. The surface topography measurement analysis and evaluation also mainly pauses in the2-D level. However, due to the limitation of the2-D display, we cannot have satisfied the requirements of industry for surface parameters. With modern photoelectric detection technology development, the topography measurement has become people’s point of research. Especially with the laser technology computer technology digital image processing technology rapid development, optical type with non-contact measurement in three-dimensional topography measurement is used more and more widely. As in the optical device precision instrument uses a lot of transparent medium, so how to get the morphology of transparent medium parameters becomes the morphology of testing a hot topic.In the first chapter subject mainly introduces the current main inside the morphology of test method and principle, of which mainly introduces projection bar line phase shift method and phase demodulation method. The second chapter of Michelson interferometer is discussed in detail, and introduces the experimental results of the light path chart and its experimental principle, that is the phase shift method, respectively for translation and rotation two kinds of method to phase shift. In the second chapter of the last, in order to verify took the image is correct or not, we introduce the simulation technology. In chapter3, to obtain the interference images we conduct a series of processing, from the remove noise, to the solution phase, to package, and then to3-D display. For rotary achieve phase shift, the size of the amount of phase shift is unknown. This subject uses two kinds of image similarity algorithm to get a full cycle of the optical image. At the same time, in order to and compared with ideal results, the simulation image has also understand phase, to package,3-D display. It is concluded that the disadvantages. The fourth chapter, summarizes the subject of the content, the deficiency existing in innovation points and prospect. In this article, we use the optical interference method、He-Ne laser、based on Michelson interferometer, measure respectively shape parameter of flat convex mirror. The optical path is simple, the function is strong. This thesis mainly completes the following concrete work.1、For the optical image noise caused by the laser speckle, choose different filter windows, using a variety of filtering methods, draw the conclusion that the Gaussian filter for the processing of the laser noise is better.2、Obtained Based on manual rotary table, rotary stage to put a thin glass phase shift the relationship between the rotation angle, the glass thickness and size of the phase shift, demonstrated the feasibility of this method.3、Due to phase shift rotation done manually, the size of the phase shift is unknown, this topic uses the image matching algorithm and peak signal to noise ratio algorithm, at last conclusions that using N-step phase shift, the specific values of N.4、Set up a easy-to-use optical platform, complete a set of transparent object measurement system. The system includes CCD. Michelson interferometer, manual turntable. He-Ne laser, space filter and system software. Among them software design using C++language development, has the very strong portability and practical.