A hyperspectral imager employing a Michelson interferometer and an infrared focal plane array detector is characterized. The system provides spatially resolved spectral information about the measurement scene. The software is developed to control all the hardware modules. Results of gas detection is performed by converting time domain signal to frequency domain. The system can identify, visualize, and track gas clouds in real time.
Nonimaging optical elements have been used for the development of CPV systems for delivering uniform flux distribution, which gives a high optical efficiency. This project presents optical modelling of a novel CPV system, which consists of a primary parabolic trough and a secondary nonimaging reflector. The proposed design sets solar cell at the center of the trough in a square shape, which achieves a geometrical concentration of 285 and optical efficiency of 72%.
A light collection and transmission design is proposed to transmit the concentrated light more uniformly into the optical fibers employing two optical elements: an eight-fold Fresnel lens and an octagonal spherical fiber connector. In addition, a bi-layer prismatic optical panel acting as a diffuser is proposed in order to distribute light more uniformly in the interior space. The proposed designs of those optical elements are verified by ray-tracing simulation for achieving the required illumination level.
A novel lighting system is proposed to transmit maximum light into the optical fibers using parabolic trough and nonimaging reflector. The proposed system increases light levels, improves installations difficulties, and maintains long-term reliability. All modules are designed and verified through raytracing simulation for calculating the efficiency and achieving the required light-levels. The proposed trough-based design inserts maximum light into the fiber bundle, which is placed at the center of the trough.
A Collision Warning and Avoidance System (CWAS) is developed for the wheeled mobile robot. Path planning is crucial for a mobile robot to perform a given task correctly. We implemented an integrated tracking system and CWAS in a mobile robot. Information on the surroundings is obtained through range sensors, and the control functions are performed through the microcontroller. The proposed system was tested using the binary logic controller and the Fuzzy Logic Controller.
A two-stage concentrated system is proposed in which light is captured, guided, and distributed through the concentrator, optical fibers, and lenses, respectively. At the capturing stage, uniform illumination solves the heat problem, which has critical importance in making the system cost-effective by introducing plastic optical fibers. The efficiency of the system is increased by collimated light, which helps to insert maximum light into the optical fibers.
A parabolic reflector-based concentration system is proposed to get collimated light, which helps to insert maximum light into the optical fibers. At the capturing stage, uniform illumination is achieved, which increases efficiency of the lighting system. Both hardware and simulation models are developed, and their results are compared.
Parabolic trough is used to capture the light and get high concentration. The concentration has been used for solar thermal systems. In this project, the trough is used for indoor illumination. Since it is difficult to achieve a high concentration, a trough compound parabolic concentrator (CPC) is used to pass the maximum captured collimated sunlight intothe optical fibers.
Imaging lenses are used to project an image onto a sensor (RGB, IR, etc.). By using imaging lenses, we can adjust magnifications, field of views, or focal lengths. By seeing the object in different ways, different features or characteristics can be observed and utilized for various applications.
A parabolic trough based optical design is proposed using two nonimaging secondary reflectors: reflective grooves and compound parabolic concentrator (CPC). The reflective grooves convert the line focus to a square shape irradiance distribution, and the CPC is used for redirecting the rays to the receiver. The CPV system reduces the number of cells compared to conventional trough-based CPV systems by attaining the concentration ratio of 285.
In this project, linear Fresnel lens is used to capture the light, and it is distributed through the optical fibers. To achieve a high concentration, a trough compound parabolic concentrator (CPC) is used to pass the maximum captured collimated sunlight intothe optical fibers.
A method is proposed for achieving collimated light, which illuminates the fiber-bundle uniformly. Light is collected through a parabolic concentrator and focused toward a collimating lens, which distributes the light over each optical fiber. An optics diffusing structure is utilized at the end side of the fiber bundle to spread light in the interior. The results clearly reveal that the efficiency in terms of uniform illumination.
A hybrid lighting system is developed using daylight and LED light. Optical-simulation results have shown that the efficiency achieved in the implemented systems — which is estimated based on the average illuminance in the interior and on the illumination quality of the system through combining daylight and LED light — is better than that of traditional lighting systems.
The system consists of an eight-fold Fresnel lens and nonimaging optical lens, which consists of eight parts. The light is focused through the Fresnel lens and then light is distributed over cell through the nonimaging lens. In the design, maximum sunlight is passed over cell by minimizing losses. Results have shown that the proposed CPV design gives good irradiance uniformity. The concentration module based on this novel design is a promising option for the development of a cost-effective photovoltaic solar energy generation.
This project presents a lighting scheme to illuminate the interior of a multi-floor building. A highly concentrated light pipe-based daylighting system is presented using heliostats. The daylighting system includes heliostats, light pipe, and light guide to collect, transmit, and distribute the light in the interior of the multi-floor building, respectively. The light guide is made of a reflective film and a prismatic optical film for distributing the light in the interior.
Nowadays, a variety of light emitters are available for different illuminative environments. This project proposes the linear microstructure to diffuse the parallel light for indoor illumination. To increase uniformity and promote illuminative area, the light emitter includes two microstructures for distribution of light.
In this project, a novel design of the collimator, which includes convex and concave lenses, is used for the illumination system. The TIR lens is used to collimate the light, and convex and concave lenses are used to converge the light to the required area.
Dr. Irfan Ullah is a Director Projects and an Associate Professor in Department of Electrical Engineering at the University of Management and Technology, Lahore, Pakistan. He was a post-doctoral fellow in the Graduate Institute of Color and Illumination Technology at the National Taiwan University of Science and Technology (NTUST), Taipei, Taiwan. He was a visiting research scholar in the Competence Center Envelopes and Solar Energy at the Lucerne University of Applied Sciences and Arts (Hochschule Luzern), Horw, Switzerland. He is the founder and Editor-in-Chief of Journal of Daylighting. He is actively involved in various projects.
Dr. Irfan Ullah is the Founder of Solarlits.com
Imaging optics Non-imaging optics Free-form optics Sequential raytracing Non-sequential raytracing Optical modeling and simulation Lighting simulation Automotive lighting Light sources Photonics Optical systems Illumination Digital image processing Hyperspectral imaging IR thermal imaging LiDAR Robotics LightTools CodeV Tracepro Zeemax FRED Solidworks
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Irfan Ullah, Optical Design of Centered-receiver CPV System, Journal of Photonics for Energy, vol. 11, pp. 035502, 2021.
Irfan Ullah, Fiber-based daylighting system using trough collector for uniform illumination, Solar Energy, vol. 196, pp. 484–493, 2020.
Irfan Ullah, Optical Modeling of Two-stage Concentrator Photovoltaic System Using Parabolic Trough, Journal of Photonics for Energy, vol. 9, no. 4, pp. 043102, 2019.
Irfan Ullah, Heliostats Daylighting System for Multi-floor Buildings, Journal of Daylighting, vol. 6, pp. 202-209, 2019.
Irfan Ullah, Hui Lv, Allen Jong-Woei Whang, Yuehong Su, Analysis of a Novel Design of Uniformly Illumination for Fresnel Lens-based Optical Fiber Daylighting System, Energy and Buildings, vol. 154, pp. 19-29, 2017.
Irfan Ullah, Allen Jong-Woei Whang, Development of Optical Fiber-Based Daylighting System and Its Comparison, Energies, vol. 8, no. 7, pp. 7185-7201, 2015.
B. Chen, B. Gao, Irfan Ullah, K. Chen, C. Chou, C. Lin, C. C.-C. Jhan, A. J. Whang, Freeform Microstructure Linear Light Emitter Design for Nature Light Illumination System, Applied Optics, vol. 54, no. 28, pp. E159-E164, 2015.
B. Chen, Y. Chen, Irfan Ullah, C. Chou, K. Chan, Y. Lai, C. Lin, C. Chang, A. J. Whang, An innovative light collimator with Afocal lens and TIR lens for daylighting system, Applied Optics, vol. 54, no. 28, pp. E165-E170, 2015.
Irfan Ullah, Seoyong Shin, Highly Concentrated Optical Fiber-Based Daylighting Systems for Multi-Floor Office Buildings, Energy and Buildings, vol. 72, pp. 246-261, 2014.
Irfan Ullah, Development of Fresnel-based Concentrated Photovoltaic (CPV) System with Uniform irradiance, Journal of Daylighting, vol. 1, no. 1, pp. 2-7, 2014.
Irfan Ullah, Furqan Ullah, Qurban Ullah, and Seoyong Shin, Integrated Tracking and Accident Avoidance System for Mobile Robot, International Journal of Control, Automation, and Systems, vol. 11, no. 6, pp. 1253-1265, 2013.
Irfan Ullah, Seoyong Shin, Development of Optical Fiber-based Daylighting System with Uniform Illumination, Journal of the Optical Society of Korea, vol. 16, no. 3, pp.247-255, 2012.
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Dr Irfan Ullah
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