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部分相干像面散斑技术 总被引:2,自引:0,他引:2
本文以光的部分相干性理论为指导,讨论了部分相干像面散斑(通常称为白光散斑)技术的关键.其结果可与激光像面散斑媲美. 相似文献
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光源编码的白光散斑剪切干涉计量术 总被引:3,自引:1,他引:2
本文提出了一种用非相干光源照明进行剪切干涉计量的方法—光源编码的白光散斑剪切干涉计量术.它采用光栅对光源进行编码以提高空间相干性,使物体的两个剪切像的波面部分相干叠加,以实现剪切干涉. 相似文献
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Transparent conducting ZnO:AI thin films with good adhesion and Iow resistivity have been prepared on organic substrates and Coming 7059 glass substrates by r.f. magnetron-sputtering technique at Iow substrate temperature (25-210℃). Structural and photoelectric properties of the deposited films are investigated. The deposited films are polycrystalline with hexagonal structure and a preferred orientation with the c-axis perpendicular to the substrate. Only the (002) peak is observed.High quality films with resistivity as Iow as 1.0 x 10- 3Ω@ cm and 8.4 x 10- 4Ω@ cm, the average transmittance over 74% and 85% in the wavelength range of the visible spectrum have been obtained on different substrates. 相似文献
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In this letter,we propose a method for the numerical calculations of the femtosecond laser pulse passed through a subwavelength aperture.The time-dependent laser pulse is decomposed into a series of monochromatic simple harmoniv waves.For the light field of the harmonic wave with a single frequency,the numerical calculation is made based on the solution of the Green's integral equation set of the electro-magnetic waves.Such numerical solution is iterated for all the waves with different frequencies,and all thenumerical solutions are transformed into the light fields in the time domain by inverse Fourier transform.The light intensity distributions transmitted the subwavelength aperture are calculated and the resultsshow the propagation of the light field is along the direction of the medium interface. 相似文献
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提出了一种新的剪切散斑干涉方法─—二次波面干涉的剪切散斑干涉计量术.这一方法将被测物体变形前后波面的第一次干涉信息分别储存在两张全息干板上,通过光学信息处理实现波面的第二次干涉.两次波面干涉分别消除了位移和位移的一阶导数场对波面位相的影响,得到仅反映位移二阶导数场的条纹图. 相似文献
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Intensity Distribution and Phase Vortices of Speckle Fields Generated by Multi-Aperture Random Scattering Screens 下载免费PDF全文
The intensity distribution and phase vortices of the speckle fields generated by multi-aperture random scattering screens are simulated, and it is found that the vortices exhibit layer-like structures and the dislocation phenomena occur in the local phase patterns produced by the two-pinhole aperture, whose phase distributions appear as striped structures. For three- or four-pinhole aperture, there are many circular bright spots appearing in the speckle grains, and there is one vortex between the neighboring circular bright spots. The positive and negative phase vortex lattices appear in the phase distributions, and the regions circled by the isothetic phase lines form irregular quadrilaterals or hexagons. Moreover, the relative positions of the vortices or bright spots can be adjusted by changing those of the pinhole apertures. 相似文献