Preparation And Performance Test Of Piezoelectric Ceramic Liquid Phase Modulator

Since modern society,astronomical telescopes have become the main medium for observing the universe.At the same time,higher requirements have been placed on the resolution.Traditional methods have increased the resolution by increasing the aperture of the telescope.A series of problems such as the difficulty of manufacturing.In order to overcome these problems,modern large-scale telescopes mainly use synthetic aperture imaging technology,which combines multiple small apertures together to achieve common phase imaging,and its resolution is equivalent to the spatial resolution of a large-aperture lens.As more and more researchers invest in the research of this technology,synthetic aperture imaging technology has become an important channel for obtaining high-resolution images,and optical phase modulators are the core part of this key technology.Enlarging the phase modulation range and accuracy of the optical phase modulator can effectively improve the resolution capability of the synthetic aperture imaging system.In this paper,an optical liquid phase modulator is prepared and exported based on a piezoelectric ceramic tube,and its related performance is tested and studied.The hollow piezoelectric ceramic tube is used as the matrix to design the structure of the phase modulator.The piezoelectric ceramic tube cavity is filled with a transparent liquid in the light transmission direction,and the length and contraction of the ceramic tube are electrically controlled to realize the phase adjustment of the transparent liquid light transmission direction.A series of optical phase modulators were output,and the bubble problem in the liquid device packaging process was studied in depth;an optical phase detection platform was built using Michelson interferometer combined with CCD and computer image acquisition system;this article is innovative A full grayscale image processing method is proposed,which can retain the original information of the image to the greatest extent,analyze the grayscale image of the regular distribution of optical intensity,and obtain the phase modulation range of the phase modulator within the control voltage range of 0-30V is(?),the phase modulation accuracy is ?/36.and compared with the traditional image processing method and the experimental results of the optical interference fringe counter,the three are highly unified,which verifies the rationality of the method.The research content of this article mainly includes four parts:1.The article first explains the background and significance of the subject,and based on this,investigates the research status of synthetic aperture imaging technology and optical phase modulators at home and abroad,and summarizes the research content and structure of this article;2.Analyze and summarize the basic theory and related characteristics of piezoelectric ceramics;3.Through theoretical model analysis,model selection,design,preparation output,problems in the preparation process and solution measures,five aspects were analyzed and summarized,and the optical liquid phase modulator based on piezoelectric ceramics was successfully prepared;4.Through the analysis and processing of the gray image of the regular distribution of optical intensity,the data processing of interferometry is to count the integral part and fractional part of the collected optical interference fringes.The variation of the interference fringe includes integer multiples and insufficient mantissas.On the basis of the interference fringe image,the traditional image processing method and the full grayscale processing method are used to detect the phase modulation characteristics of the device,and the correctness of the full grayscale processing method is verified by the optical interference fringe counter.The results show that the displacement measurement accuracy can be controlled at the micron level and the pixel-level resolution can be achieved to meet the phase modulation accuracy requirements of the optical synthetic aperture neutron mirror.At the end of the article,it summarizes the work of the whole subject and proposes the directions for further research and development in the future.