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Proceedings Paper

Effect of tilted metallic mesh on modulation transfer function of optical system
Author(s): Zhengang Lu; Zhigang Fan; Dandan Zheng
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Paper Abstract

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.

Paper Details

Date Published: 12 January 2009
PDF: 6 pages
Proc. SPIE 7133, Fifth International Symposium on Instrumentation Science and Technology, 713338 (12 January 2009); doi: 10.1117/12.821244
Show Author Affiliations
Zhengang Lu, Harbin Institute of Technology (China)
Zhigang Fan, Harbin Institute of Technology (China)
Dandan Zheng, Harbin Institute of Technology (China)

Published in SPIE Proceedings Vol. 7133:
Fifth International Symposium on Instrumentation Science and Technology
Jiubin Tan; Xianfang Wen, Editor(s)

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