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Abstract
Two-dimensional numerical solutions are carried out to asses the quality of obstructing apertures in terms of the diffraction limited resolution. This include the quality of the point spread function (psf), the modulation transfer function (MTF), and an image of double lines. These are average intensity of the psf (AI), maximum intensity of the psf,(MI), full width at half maximum of the psf (FW) average frequency components of MTF (AFC), and average side loops of an image of a double lines. The results indicate that the separation of the two lines becomes recognizable using central obstruction of radius equal to or greater than approximately 0.6 times the radius of the primary aperture.
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References
- BALDWIN, J.E., TUBBS, R.N., COX, G.C., MACKAY, C.D., WILSON, R.W. and ANDERSON, M.I. 2001. Diffraction limited 800 nm imaging with 2.56 m Nordic optical telescope. Astronomy and Astrophysics 368: L1-L4.
- BRUMMELAAR, T.A. and BAGNUOLO, W.G. 1995. Strehl ratio and visibility in long baseline stellar interferometry. Optics Letters 20: 521-23.
- BRUMMELAAR, T.A., BAGNUOLO, W.G. and RIDGWAY, S.T. 1994. Strehl ratio and coherence loss in long baseline interferometry. Technical Report, Center for High Angular Resolution Astronomy Georgia State University, No. 6.
- CHAKRABORTY, A. and THOMPSON, L.A. 2005. 10 contrast ratio at 4.5 /D:New results obtained in laboratory experiments using nonfabricated coronograph and multi-Gaussian shaped pupil masks. Optics express 13: 2394.
- DEBES, J. 2003. High contrast imaging with Gaussian aperture pupil mask. astro-ph 0301051, V 1.
- FIENUP, J.R. 2000. MTF and integration time versus fill factor for sparse-aperture imaging system. Proc. SPIE. 4091 A-06 San Diego, CA.
- GRANIERI, S., ENRIQUE, E. and FURLAN, W.D. 1998. Performance analysis of optical imaging systems based on fractional Fourier transform. Journal of Modern Optics 45: 1797-07.
- HARVEY, J.E and FTACLAS, C. 1995. Diffraction effects of telescope secondary mirror spiders on various image quality criteria. Applied Optics 34: 6337-49.
- JEAN-MARC, D., LEGER, D., ROGUES, S. and VALORGE, C. 2004. Modulation transfer function estimation from non specific images. Optical Engineering 43: 1355-65 DONAL, F.O’shea; Ed.
- MILANFAR, P. and SHAKOURI, A. 2002. Statistical analysis of diffraction limited images. IEEE ICIP.
- MOHAMMED, A.T., RASHID, N.M. and SADIK, A.R. 1990. Computer simulations of astronomical objects as seen by ground based optical telescope. Optics and Lasers in Engineering 12: 223-43.
- MOHAMMED, A.T. 2006. Quantitative analysis of imaging with apodized square apertures. Iraqi Journal of Science 47: 255-61.
- SONG, JONG.SUP., LEE YUN WOO, SONG JAE BONG, LEE IN WON, YANG HO-SOON, CHOI YOUNG-WAN, and DUAL JAE HEUNGO JO. 2002. Dual testing of a large aperture optical system. Proc. SPIE, Interferometry XI:Applications, 4778: 227-36.
- WILLIAM, C. and BECKLUND, O. 1989. Introduction to the Optical Transfer Function. Wiley Series in Pure and Applied Optics.
References
BALDWIN, J.E., TUBBS, R.N., COX, G.C., MACKAY, C.D., WILSON, R.W. and ANDERSON, M.I. 2001. Diffraction limited 800 nm imaging with 2.56 m Nordic optical telescope. Astronomy and Astrophysics 368: L1-L4.
BRUMMELAAR, T.A. and BAGNUOLO, W.G. 1995. Strehl ratio and visibility in long baseline stellar interferometry. Optics Letters 20: 521-23.
BRUMMELAAR, T.A., BAGNUOLO, W.G. and RIDGWAY, S.T. 1994. Strehl ratio and coherence loss in long baseline interferometry. Technical Report, Center for High Angular Resolution Astronomy Georgia State University, No. 6.
CHAKRABORTY, A. and THOMPSON, L.A. 2005. 10 contrast ratio at 4.5 /D:New results obtained in laboratory experiments using nonfabricated coronograph and multi-Gaussian shaped pupil masks. Optics express 13: 2394.
DEBES, J. 2003. High contrast imaging with Gaussian aperture pupil mask. astro-ph 0301051, V 1.
FIENUP, J.R. 2000. MTF and integration time versus fill factor for sparse-aperture imaging system. Proc. SPIE. 4091 A-06 San Diego, CA.
GRANIERI, S., ENRIQUE, E. and FURLAN, W.D. 1998. Performance analysis of optical imaging systems based on fractional Fourier transform. Journal of Modern Optics 45: 1797-07.
HARVEY, J.E and FTACLAS, C. 1995. Diffraction effects of telescope secondary mirror spiders on various image quality criteria. Applied Optics 34: 6337-49.
JEAN-MARC, D., LEGER, D., ROGUES, S. and VALORGE, C. 2004. Modulation transfer function estimation from non specific images. Optical Engineering 43: 1355-65 DONAL, F.O’shea; Ed.
MILANFAR, P. and SHAKOURI, A. 2002. Statistical analysis of diffraction limited images. IEEE ICIP.
MOHAMMED, A.T., RASHID, N.M. and SADIK, A.R. 1990. Computer simulations of astronomical objects as seen by ground based optical telescope. Optics and Lasers in Engineering 12: 223-43.
MOHAMMED, A.T. 2006. Quantitative analysis of imaging with apodized square apertures. Iraqi Journal of Science 47: 255-61.
SONG, JONG.SUP., LEE YUN WOO, SONG JAE BONG, LEE IN WON, YANG HO-SOON, CHOI YOUNG-WAN, and DUAL JAE HEUNGO JO. 2002. Dual testing of a large aperture optical system. Proc. SPIE, Interferometry XI:Applications, 4778: 227-36.
WILLIAM, C. and BECKLUND, O. 1989. Introduction to the Optical Transfer Function. Wiley Series in Pure and Applied Optics.