Simulation and Evaluation of a Variable Effective Focal Length of Refractive Binocular Telescope

Main Article Content

Alaa K. Shwayyea
Alaa Badr Hasan

Abstract

The telescope works to magnify images of distant objects in general, but it needs special optical elements to complete the task to the fullest. The telescope needs optimal balance values of the optical parameters used to produce the best image, such as the effective focal length and the diameter of the pupil aperture, which are combined in a single concept called the focal number. The ground-based binary telescope relies on special lenses and an exceptional prism to achieve a hybrid design that produces clear images of relatively distant terrestrial objects. The pupil diameter of the telescope is relatively large to ensure that the largest possible amount of light is received, and as a result, a good image is obtained.


In this work, an achromatic objective lens and a Porro prism has been used to reduce the length of the telescope and change the path of the rays to the eyepiece, in addition to the presence of a flat convex lens behind the prism to collect the rays coming from it to reach the eyepiece. The effective focal length of the optical system was changed to illustrate the effect of this factor on the performance of a telescope and as a result of its effect on the image quality.

Article Details

How to Cite
K. Shwayyea, A. ., & Hasan, A. B. (2022). Simulation and Evaluation of a Variable Effective Focal Length of Refractive Binocular Telescope. Ibn AL-Haitham Journal For Pure and Applied Sciences, 35(3), 65–75. https://doi.org/10.30526/35.3.2857
Section
physics

References

Betul, S.; Barbara, L.; Xavier, L.; Adaptive optics with pupil tracking for high resolution retinal imaging, Biomed Opt Express.2012,3, 225–239.

Navarro, R.; Santamarıa, J.; Bescos, J.; Accommodationdependent model of the human eye with aspherics, J Opt Soc Am A.1985,2, 1273–1281.

Lu JN, Gao ZL. Design of the new zoomstereo microscope objective. Optical Instruments. 2011,33, 36–42.

Al-Hamdani, A.H.; Rashid, H.G.; Hasan. A.B.; Irradiance distribution of image surface in microlens array solar concentrator. ARPN Journal of Engineering and Applied Sciences, 2013,5, 23-31.

Al-Saadi, T.M.; Hussein, B. H.; Hasan, A. B.; Shehab, A. A.; Study the structural and optical properties of Cr doped SnO 2 nanoparticles synthesized by sol-gel. methodEnergy Procedia. 2019,157, 457–465.

Hasan, A.B.; Husain,S. A.; Design of Light Trapping Solar Cell System by Using Zemax Program. Journal of Physics: Conference Series. 2018,1003, 25- 32.

Ferster, D. A.; comparison of binocular depth mechanisms areas 17 and 18 of the cat visual cortex. J. Physiol. 1981,311, 623–655.

Fleet, D.J. ; Wagner, H.; Heeger, D. J.; Encoding of binocular disparity: energy models, position shifts and phase shifts. Vision Res. 1996, 36, 1839–1858.

Santamaría, J.; Artal, P.; L. Bescós.; Determination of the pointspread function of human eyes using a hybrid optical-digital method. J. Opt. Soc. Am. A 4, 1987.1109–1114.

Liang, J.; Grimm,B.; Goelz, S.; Bille. J. F.; Objective measurement of wave aberrations of the human eye with the use of a Hartmann-Shack wave-front sensor. J. Opt. Soc. Am. A .1994, 11, 1949–1957

Rodríguez, P.; Navarro, R.; Double-pass versus aberrometric modulation transfer function in green light. Journal of Biomedical Optics. 2007,12, 044018

Chirre, E.; Prieto, P. M.; Artal, P.; Binocular open-view instrument to measure aberrations and pupillary dynamics. Optics Letters. 2014, 39, 4773–4775

Fernández, E. J.; Prieto, P. M.; Artal, P.; Binocular adaptive optics simulator.Optics Letters. 2009, 34, 2628–2630

Sabesan, R.; Zheleznyak, L.; Yoon,G.; Binocular visual performance and summation after correcting higher order aberrations.Biomedical Optics Express. 2012,3, 3176–3789

Hasan, A. B.; Studying Optical Properties of Quantum Dot Cylindrical Fresnel Lens. NeuroQuantology, 2022, 20, 97–104.

Hamza, H. N. ; Hasan, A. B.; Design of Truncated Hyperboloid Solar Concentrator by Using Zemax Program. Ibn Al-Haitham Jour. for Pure & Appl. Sci. 2022, 35(1), 1-7.