| Ceramic materials generally have excellent characteristics of high hardness,hig h temperature resistance,excellent wear resistance and light weight,and have broad application prospects in many fields such as aerospace,medical,mobile phones and automobiles.However,because ceramic materials are brittle materials,their mechanical properties play a key role in ensuring safe use,and this requires a focus on the production process.Non-contact detection technology is the main detection method in the current testing field,ensuring the non-contact of the production process,accurately detecting the quality of the production products,and performing related quality inspection on ceramic materials to improve the reliability of the application process.Has an important position.As a kind of non-contact measurement,the laser wave number scanning interferometry method has excellent characteristics of high stability,strong anti-interference ability and high signal-to-noise ratio.The main work of this research is:(1)build a measurement system based on laser wave number scanning interfero metry technology,(2)and verify that the system can be applied to the field of ceramic material detection with weak reflection characteristics.Provides a new method for measuring the mechanical properties of ceramic materials.This paper first introduces the method of ceramic materials in the field of non-destructive testing,focusing on the research status of laser wavenumber scanning interferometry at home and abroad and the research results obtained so far.The laser wave number scanning interferometry method is described in detail from the theoretical basis and the optical path system design,including wave number scanning method,wave number monitoring method,random Fourier transform theory and the overall structure of optical path system and its hardware equipment selection.index.Then the measurement principle of the out-of-plane displacement field is described in detail from the formula derivation,and the Fourier transform which can effectively improve the anti-noise ability and reduce the noise point is further clarified under the previous basic theory of wave-number scanning interferometry.-The basic principle of the interference spectrum nonlinear least squares algorithm.Next,with the support of the complete theory and hardware system,the off-plane displacement field of the alumina ceramic piece was measured by the measurement system,and the experimental operation process of the measurement system,the experimental method of the sample,the acquisition of the data and its subsequent The data processing steps are described in detail.At the end of the paper,the measurement data of the alumina ceramic material obtained by the experimental process is given,that is,the out-of-plane displacement field distribution diagram of the ceramic material under different stress conditions,and the data results are analyzed under different angles,and the defects are compared.The experimental data of the alumina ceramic sheets containing the defects were analyzed by detailed results.It can be seen from the experimental results that the displacement displacement of the alumina ceramic sheet is different under different stresses,and the deformation increases with the increase of the force,and the whole changes linearly.Through the analysis of experimental data,on the one hand,the correctness of the wavenumber scanning interferometry technology is theoretically verified.On the other hand,the feasibility of the measurement system is demonstrated,and the non-contact measurement characteristics of the full field of view are obtained.The availability of laser wavenumber scanning interferometry in the field of mechanical properties detection of ceramic materials is confirmed,and a new method is provided in this field. |
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