Novel non-imaging optic design for uniform illumination

Babadi, Sina; Ramirez-Iniguez, Roberto; Boutaleb, Tuleen; Mallick, Tapas K.

doi:10.1117/12.2209351

Cited by 10 publications

(5 citation statements)

References 6 publications

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“…The minCost is an upper bound on the length of the best tour, and it is improved every time by finding a shorter tour (lines [18][19]. Whenever a shorter tour is found, the current sensor (as a CH) is maintained in T * which finally gives us the optimal tour (line 20).…”

Section: Optimal Clustering Algorithmmentioning

confidence: 99%

“…The proposed algorithm is performed iteratively, while taking advantage of randomness and greediness to obtain an acceptable solution among the local optimal solutions. The greediness provides faster convergence to a local minimum while decreasing the search time in each iteration [19]. The randomisation contributes in achieving different solutions in each local search.…”

Section: Heuristic Clustering Algorithmmentioning

confidence: 99%

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An Efficient AUV-Aided Data Collection in Underwater Sensor Networks

Ghoreyshi

Shahrabi

Boutaleb

2018

2018 IEEE 32nd International Conference on Advanced Information Networking and Applications (AINA)

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From the view of routing protocols in Underwater Sensor Networks (UWSNs), mobile data-gathering mechanisms using Autonomous Underwater Vehicle (AUV) have received significant attention because of data collection capability via shortrange communications. In this paper, a new Cluster-based AUVaided Data Collection scheme (CADC) for large-scale UWSNs is proposed to make a trade-off between energy saving and data gathering latency. Our scheme consists of three phases: discovery phase, clustering phase, and data gathering phase. Neighbouring information is exchanged and then collected by AUV during the discovery phase. The collected information is used in the clustering phase in order to determine the cluster heads and members. Then, the AUV tour is planned such that all cluster heads are visited while shortening the tour length of the AUV. To cluster the sensors and cover their heads with the shortest possible tour, we first propose an optimal algorithm to find the global optimal solution, and then propose an efficient algorithm to obtain the near-optimal solution in the less computational time. CADC is scalable and also applicable in both connected and disconnected networks. In terms of energy-latency trade-off, CADC can effectively keep the tour length short while prolonging the network lifetime compared to those of mobile data-gathering approaches. The effectiveness of CADC is validated through an extensive simulation study which reveals the performance improvement in the packet delivery ratio, energy saving, and data gathering latency.

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Section: Optimal Clustering Algorithmmentioning

confidence: 99%

Section: Heuristic Clustering Algorithmmentioning

confidence: 99%

An Efficient AUV-Aided Data Collection in Underwater Sensor Networks

Ghoreyshi

Shahrabi

Boutaleb

2018

2018 IEEE 32nd International Conference on Advanced Information Networking and Applications (AINA)

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“…The Ant Colony Optimization (ACO) algorithm, combined with dynamic source-target mapping, was adopted to find suitable aiming vectors for modular reflectors for solar power stations in space [20]. Non-imaging optics mainly concern energy transmission efficiency and heat flux distribution instead of imaging quality [21]. This meet current requirement of achieving specific heat flux on a target surface.…”

Section: Introductionmentioning

confidence: 99%

Optical Model of Thermal Radiation Loading System for Turbine Vane Leading Edge

2021

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With the increase of combustion temperatures, the thermal radiation effect for hot components in the new generation of aero-engines has become a key factor in the combustion process, cooling structure design, and thermal protection. A radiation loading system can be used as an external heat source to simulate the real thermal environment of hot components in aero-engines. Total receiving power, as well as 3-D heat flux distribution, should better coincide with real conditions. With the aid of freeform optics and the feedback optimization method, the current study develops a concentrating-type radiation heating system fit for the leading-edge surface of a C3X turbine vane. A xenon lamp combined with a freeform reflector was optimized for controllable heat flux. A design method in the area of illumination engineering was innovatively extended for the current model. Considering the effect of polar angular radiative flux distribution of a xenon lamp, a Monte Carlo ray tracing (MCRT) method was adopted to evaluate the optical performance. Feedback modifications based on Bayesian theory were adopted to obtain the optimal shape of the FFS for target heat flux. The current study seeks a feasible way to generate 3-D heat flux distribution for complex curved surfaces, such as turbine vane surfaces, and helps to simulate the real thermal environment of hot components in aero-engines.

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“…Despite enormous advantages of LEDs, it is impossible to implement LEDs directly for the street lighting. Normally, LEDs have Lambertian radiation pattern which illuminates a circle spot on the target plane with high intensity at the centre and low intensity at the edge of the illuminated area [8]. Therefore, it is necessary to combine LEDs with a secondary optic to provide uniform illumination to meet the national and international street lighting standards (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…EN 13201 part 1-5 (2013) and BS 5489). A variety of designs for the secondary optics have been proposed and investigated in recent decades [8].…”

Section: Introductionmentioning

confidence: 99%

An optimisation of a freeform lens design for LED street lighting

Babadi

Ramirez-Iniguez

Boutaleb

et al. 2016

2016 International Conference for Students on Applied Engineering (ISCAE)

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The number of light emitting diodes (LEDs) used in a variety of applications is increasing rapidly. A good example of an application where this is happening is street lighting. The increasing use of LEDs is due to their advantages compared to other sources of illumination. However, LEDs are not without disadvantages. One of their main drawbacks when used for street lighting without an adequate secondary optic is that they tend to produce a circular footprint with high intensity at the centre and low intensity at the edge of the illuminated area, which prevents them from satisfying national and international standards for uniformity of illumination. This paper presents a new energy mapping method to design a freeform lens to generate uniform illumination of over 95% on the target plane. The lenses presented in this paper have been designed with two different entrance apertures: (i) A hemisphere subtracted aperture (ii) a flat entrance aperture .

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Novel non-imaging optic design for uniform illumination

Cited by 10 publications

References 6 publications

An Efficient AUV-Aided Data Collection in Underwater Sensor Networks

An Efficient AUV-Aided Data Collection in Underwater Sensor Networks

Optical Model of Thermal Radiation Loading System for Turbine Vane Leading Edge

An optimisation of a freeform lens design for LED street lighting

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