Point Diffraction Interferometer Pore Size Distribution Of The Diffracted Light Intensity

As a interference measuring method with high precision,the point-diffraction interference technique has a wide application space both in military and civil areas,the measurement accuracy mainly depends on the dimension of the pinhole.This paper has taken the pinhole part in point-diffraction interferometer as a background and researched effects by the pinhole with wavelength order to the intensity in diffraction field,obtained the result of the relation between the intensity in diffraction field and the pinhole's dimension.From the study of the scalar and vector diffraction theory,this paper has taken the ideal incident light and the incident light with primary spherical aberration as investigated subject,achieved the computational formula of diffraction intensity produced by the pinhole with wavelength order,acquired the relation between the intensity in diffraction field and the pinhole's dimension.According to the numerical calculation,this paper has summarized the data and reason of the inaccurate representation in using scalar diffraction theory to analyse the pinhole diffraction problem.Then using the vector diffraction theory to analyse the influence by pinhole in diffraction light intensity,achieve the same conclusion from three different theory views.This paper also has achieved the objective data and relation between pinhole's dimension and diffraction light intensity from the numerical calculation,and verified the conclusion of electric field component's leading role in the contribution to diffraction light intensiry.This paper has programmed several kinds of calculation method of the diffraction light intensity by MATLAB,providing the necessary numerical calculation method to the following research.To get the result of diffraction light intensity by differentpinhole's dimension,the handle only need to alter initial parameters in the program. The useful conclusions and necessary programs in this paper will help the following research to get more achievements.