Loading...
Search for:
fourier-optics
0.006 seconds
Reconstruction of 3D Images in Integral Imaging by Using Fourier Optics
, M.Sc. Thesis Sharif University of Technology ; Mehrany, Khashayar (Supervisor)
Abstract
In this thesis, the unwanted effects of diffraction and defocus aberration in three-dimensional (3D) integral imaging are taken into account by using the principles of Fourier optics approach. First, the indirect reconstruction of 3D images is simulated by using the geometrical optics and then the direct reconstruction process is simulated via Fourier optics. The role of diffraction and defocus aberration in deterioration of the depth of field is studied for both real/virtual and focused modes of integral imaging. The extent of image deterioration in 3D integral imaging is compared against the extent of deterioration in conventional single lens imaging. The field of view of the 3D integral...
Image Reconstruction in Superconducting Bolometric Detector Infra Red Imaging System Based on Physical Optics Principle
, M.Sc. Thesis Sharif University of Technology ; Fardmanesh, Mehdi (Supervisor) ; Kavehvash, Zahra (Co-Supervisor) ; Mirzaei, Eiman (Co-Supervisor)
Abstract
Recently Infrared imaging has been very much considered for its applications.and because the infrared wavelengths are harmless, considered in medical and industrial applications. the imaging system examined in this thesis is passive and the object's own radiation is received by a single-pixel detector, these images are taken by two superconducting sensors and a pyroelectric Sensor. the purpose of this thesis is to improve the quality of images And reconstruction for the resulting images and if possible, optimize the system. to improve this system, various work has been proposed and done. including parabolic mirror distortion survey available in the system and compensated for it, take a...
Design & Analysis of a DNA String Matching System Based on Optical Parallel Processing
, M.Sc. Thesis Sharif University of Technology ; Kavehvash, Zahra (Supervisor) ; Koohi, Somaie (Co-Advisor) ; Khavasi, Amin (Co-Advisor)
Abstract
In recent years, the biological evolution of molecular detection capabilities based on gene analysis has provided a reliable performance in the diagnosis of a disease before a symptom emerges. Human gene storage requires a large amount of computer memory (about 1.5 GB for each DNA) and the search for a specific pattern within it with electronic computers is time and power consuming. Optical computing uses light parallel processing capabilities to find the pattern in a digital field, which can be used to process large volumes of data in short time and low power consumption, while electronic computers process data in series with high power dissipation. According to the Optalysys report, the...
Speeding up DNA sequence alignment by optical correlator
, Article Optics and Laser Technology ; Volume 108 , 2018 , Pages 124-135 ; 00303992 (ISSN) ; Babashah, H ; Koohi, S ; Kavehvash, Z ; Sharif University of Technology
Elsevier Ltd
2018
Abstract
In electronic computers, extensive amount of computations required for searching biological sequences in big databases leads to vast amount of energy consumption for electrical processing and cooling. On the other hand, optical processing is much faster than electrical counterpart, due to its parallel processing capability, at a fraction of energy consumption level and cost. In this regard, this paper proposes a correlation-based optical algorithm using metamaterial, taking advantages of optical parallel processing, to efficiently locate the edits as a means of DNA sequence comparison. Specifically, the proposed algorithm partitions the read DNA sequence into multiple overlapping intervals,...
Temporal analog optical computing using an on-chip fully reconfigurable photonic signal processor
, Article Optics and Laser Technology ; Volume 111 , 2019 , Pages 66-74 ; 00303992 (ISSN) ; Kavehvash, Z ; Khavasi, A ; Koohi, S ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
This paper introduces the concept of on-chip temporal optical computing, based on dispersive Fourier transform and suitably designed modulation module, to perform mathematical operations of interest, such as differentiation, integration, or convolution in time domain. The desired mathematical operation is performed as signal propagates through a fully reconfigurable on-chip photonic signal processor. Although a few numbers of photonic temporal signal processors have been introduced recently, they are usually bulky or they suffer from limited reconfigurability which is of great importance to implement large-scale general-purpose photonic signal processors. To address these limitations, this...