A novel scanning lens instrument for evaluating Fresnel lens performance: Equipment development and initial results
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A system dedicated to the optical transmittance characterization of Fresnel lenses has been developed at NREL, in collaboration with the UPM. The system quantifies the optical efficiency of the lens by generating a performance map. The shape of the focused spot may also be analyzed to understand change in the lens performance. The primary instrument components (lasers and CCD detector) have been characterized to confirm their capability for performing optical transmittance measurements. Measurements performed on SoG and PMMA lenses subject to a variety of indoor conditions (e.g., UV and damp heat) identified differences in the optical efficiency of the evaluated lenses, demonstrating the ability of the Scanning Lens Instrument (SLI) to distinguish between the aged lenses.Keywords:
Fresnel lens
Optical instrument
Characterization
This project involved the manufacturing of curved-faceted, injection-molded, four-element Fresnel lens parquets for concentrating photovoltaic arrays. Previous efforts showed that high-efficiency (greater than 82%) Fresnel concentrators could be injection molded. This report encompasses the mold design, molding, and physical testing of a four-lens parquet for a solar photovoltaic concentrator system.
Fresnel lens
Molding (decorative)
Concentrator
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This study reports the current progress of the novel thermal-actuated tunable focal-length micro polymer (PDMS) lens. The prototype of solid state only tunable lens demonstrates a typical variation of focal length from 1852 mum to 1083 mum under a 60 mA driving current. Moreover, this study also demonstrates the capability to integrate the tunable polymer lens with other optical components such as the conventional and dual-focus Fresnel lens. The resulted compound (PDMS+Fresnel) lens reduced the focal-length of Fresnel lens from 13500 mum to 5038 mum. Moreover the focal-length of compound lens was further dropped to 3523 mum at 60 mA driving current. A dual-focus compound lens was also realized to reduce its focal-length from 8000 mum/4000 mum to 1343 mum/975 mum. The compound lens has potential to further perform beam shaping and remove aberrations.
Fresnel lens
Simple lens
Fresnel zone
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We have investigated a photo alignment material for fringe field switching (FFS) liquid crystal display and it has good alignment performance. It realizes alignment by irradiating linearly polarized light with wavelength of 254nm. We have investigated the factors that affect the transmittance in photo alignment FFS mode. The transmittance becomes smaller with the alignment angle increasing. The transmittance is also affected by the L/S width of the ITO electrode, it becomes smaller with the L/S increasing. The LC type also affect the transmittance, we can get higher transmittance using negative LC.
Visible spectrum
Mode (computer interface)
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An experimental model of a solar hybrid system including photovoltaic (PV) module, concentrating Fresnel lens, thermoelectric generator (TEG), and running water heat extracting unit was created and studied. The PV module used was of c-Si and TEG of Bi2Te3; the Fresnel lens (solar concentrator) and TEG share an optical train, whereas PV module was illuminated separately with non-concentrated light. Heat extracting unit operated in thermo siphon mode. In climatic conditions of Mexico (Queretaro, 20o of North latitude, summer time), the Fresnel lens accepted 120 W of solar radiation power, and the system generated 7.0 W of electric power and 30 W of thermal one. The discussion is made of the possible characteristics of a hypothetical hybrid system where all its elements share the same optical train. Copyright © 2016 John Wiley & Sons, Ltd.
Fresnel lens
Thermoelectric generator
Solar cable
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A system dedicated to the optical transmittance characterization of Fresnel lenses has been developed at NREL, in collaboration with the UPM. The system quantifies the optical efficiency of the lens by generating a performance map. The shape of the focused spot may also be analyzed to understand change in the lens performance. The primary instrument components (lasers and CCD detector) have been characterized to confirm their capability for performing optical transmittance measurements. Measurements performed on SoG and PMMA lenses subject to a variety of indoor conditions (e.g., UV and damp heat) identified differences in the optical efficiency of the evaluated lenses, demonstrating the ability of the Scanning Lens Instrument (SLI) to distinguish between the aged lenses.
Fresnel lens
Optical instrument
Characterization
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The development of micro satellites for the last two decades is emerging rapidly as the need of satellite communication usage is increasing. Earth observation is one of the example of how satellites are on demand. Most observation satellites consist of sensors and imaging system on-board. One of the key element to have a good imaging system is a special optical lens system design. Such lens is designed specifically by calculating every parameter such as refractive, reflective indexes, type of surface, distance and many more. Manufactured lenses sometimes do not match the requirement of an imager system hence the special lens design is needed. This paper will first briefly describe the history of optic, theory related to lens system, then the design and the analysis of lens system for micro-satellites generally and LAPAN A4 particularly.
Through-the-lens metering
Optical instrument
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A system dedicated to the optical transmittance characterization of Fresnel lenses has been developed at NREL, in collaboration with the UPM. The system quantifies the optical efficiency of the lens by generating a performance map. The shape of the focused spot may also be analyzed to understand change in the lens performance. The primary instrument components (lasers and CCD detector) have been characterized to confirm their capability for performing optical transmittance measurements. Measurements performed on SoG and PMMA lenses subject to a variety of indoor conditions (e.g., UV and damp heat) identified differences in the optical efficiency of the evaluated lenses, demonstrating the ability of the Scanning Lens Instrument (SLI) to distinguish between the aged lenses.
Fresnel lens
Optical instrument
Characterization
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Because of the low utilization of solar energy and the high cost of photovoltaic power,Fresnel lens were used to focus sunlight from the point of concentrator.On the basis of the analysis of the structure of Fresnel lens,the evaluation indexes of the lens were put forward and a 1 000 mm diameter Fresnel lens which can meet the demands was designed,the location of the lens when it concentrates light was also discussed.The design has a certain universal,which can be applied to other large diameter Fresnel lens design,it is important to promote the development of solar energy collection.
Fresnel lens
Fresnel zone antenna
Concentrator
Zone plate
Fresnel number
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The demand for process heat particularly low pressure steam is increasing in recent past. Solar energy can be utilized for generating medium temperature (100°C -150°C) low pressure (T<200°C) steam. By using solar concentrators, low pressure steam can be generated by using low cost technology (1). Fresnel lens solar concentrators are very useful to generate low pressure steam for industrial and cooking applications. The study of performance of Fresnel lens solar concentrator and steam generation using Fresnel lens solar concentrator is presented in this paper. The overall efficiency of Fresnel lens solar concentrator is around 51% and can generate process steam required in the industry. The thermal performance and cost benefits of Fresnel lens solar concentrator are also described. The studies presented in this paper concerns with Fresnel Lens Solar Concentrator System which are most useful for generating process heat for industrial applications. Thermal performance of Fresnel lens solar concentrator (FLSC) system can be studied by evaluating useful heat gain from the system when exposed to solar radiation (1). FLSC system consists of Fresnel lens, receiver tracking system and heat removing device. An attempt has been made to evaluate the performance of FLSC system with two methods viz.continuous fluid flow test method and Steam generation test method. The study reveals that Fresnel lens Solar Concentrator system has a very good potential in generation of low pressure steam.
Fresnel lens
Concentrator
Fresnel number
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An experimental method is used to measure the optical parameters of a GRIN lens. The intrinsic properties of the lens are well characterized by measuring the intercept values of the different GRIN lenses. Firstly, the intercept equation is derived from the transmission matrix of the GRIN lens, and the measurement method is described in detail. Secondly, we design and make the optical path measuring system. Finally, the error analysis of the experimental results is presented, which shows the feasibility of the working principle and the experiment operation. The principle and equipment of this measuring method are relatively effective, which affords great practical significance for the measurement of the GRIN lens.
Optical path
Optical instrument
Measuring principle
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