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In order to analyze the effect of a tilted metallic mesh on the modulation transfer function (MTF) of an optical system,
the relation between the MTF and tilted angle &ptheta; of the mesh was established through calculating the point spread
function (PSF) of the tilted mesh using a model based on Huygens-Fresnel diffraction theory and then conducting
Fourier transform on the calculated PSF. It was found through analyses that the density of triangular spikes on the MTF
curve is compressed by 1/cos(&ptheta;) times along axis x, and the MTF values are degraded due to the stretch and
asymmetrical distribution of diffraction spots of the tilted mesh; moreover, when the aperture of the mesh is so small that
it is the optical stop itself, the cutoff frequency of MTF along axis x decreases by cos(&ptheta;) times and the MTF values drop
largely. The degradation effect on MTF caused by a tilted mesh can be reduced by using a large-size metallic mesh and
increasing the porosity ratio of metallic mesh.
Zhengang Lu,Zhigang Fan, andDandan Zheng
"Effect of tilted metallic mesh on modulation transfer function of optical system", Proc. SPIE 7133, Fifth International Symposium on Instrumentation Science and Technology, 713338 (12 January 2009); https://doi.org/10.1117/12.821244
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Zhengang Lu, Zhigang Fan, Dandan Zheng, "Effect of tilted metallic mesh on modulation transfer function of optical system," Proc. SPIE 7133, Fifth International Symposium on Instrumentation Science and Technology, 713338 (12 January 2009); https://doi.org/10.1117/12.821244