In order to achieve competitive system costs in mass-production, it is essential that CPV concentrators incorporate sufficient manufacturing tolerances. This paper presents an advanced concentrator optic comprising a Fresnel lens and refractive secondary element, both with broken rotational symmetry, producing the desired light concentration high tolerance (high acceptance angle) as well excellent homogenization by Köhler integration. compares conventional Fresnel-based concentrators.

The Concentrated Photovoltaics (CPV) promise relies upon the use of high-efficiency triple-junction solar cells (with proven efficiencies over 44%) and high-performance optics that allow for high concentration concurrent with relaxed manufacturing tolerances (all key elements low-cost mass production).Additionally, uniform illumination is highly desirable efficiency reliability reasons.All these features have to be achieved inexpensive containing only a few (in general no more than 2)...

The field of concentrated photovoltaics (CPV) has met some remarkable advances in recent years. continuous increase conversion efficiency multijunction solar cells and new advancements optics have led to demands opportunities for optical design CPV. This paper is a mini-review on current requirements CPV design, it presents the main trends years systems architecture.

The optical design presented here has been done in order to achieve superior performance comparison with the state-of-the-art Fresnel CPV systems. consists of a Photovoltaic Concentrator (CPV) comprising lens (F) as Primary Optical Element (POE) and dielectric solid RXI Secondary (SOE), both free-form surfaces (i.e. neither rotational nor linearly symmetric). It is first time RXI-type geometry applied secondary. This concentrator ultra-high CAP value ready accommodate more efficient cells...

We present novel advanced optical designs with a dramatically smaller display to eye distance, excellent image quality and large field of view (FOV). This enables headsets be much more compact, typically occupying about fourth the volume conventional headset same FOV. The design strategy these optics is based on multichannel approach, which reduces distance from size itself. Unlike microlens arrays, are also devices, our use freeform surfaces produce imaging in entire view, even when...

This paper describes two key components for VR: optics and high‐resolution microdisplay. Within the European‐funded project LOMID a new microdisplay with WUXGA resolution an ultra‐compact has been developed. The enables very high VR by using four displays at same time in particularly compact design.

It is essential to obtain high values of tolerance for PV concentrators because manufacturing process always implies some accuracy errors. In this way, three new free-form are presented here, combining geometric concentration and (high acceptance angle). This achieved by using the SMS3D design method, which most advanced method surfaces in non-imaging optics. Uniform illuminance on cell important as well, proper behavior durability system, so our designs will have homogenizer elements. We...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation P. Benítez, R. Mohedano, M. Buljan, J. C. Miñano, Y. Sun, W. Falicoff, Vilaplana, Chaves, G. Biot, López; Ultra‐High Efficiency, High‐Concentration PV System Based On Spectral Division Between GaInP/GaInAs/Ge And BPC Silicon Cells. AIP Conf. Proc. 1 December 2011; 1407 (1): 88–92....

A novel and advanced photovoltaic concentrator optic is presented comprising a Fresnel lens dielectric solid RXI as secondary optical element, both with free-form surfaces (i.e. neither rotational nor linear symmetry). The designed the Simultaneous Multiple Surface (SMS) design method of Nonimaging Optics. In optics rays undergo refraction (R), reflection (X) total internal (I), so SMS nomenclature [2] for device assigning letters to each surface that deflects rays. This first time RXI-type...

In present commercial Virtual Reality (VR) headsets the resolution perceived is still limited, since VR pixel density (typically 10-15 pixels/deg) well below what human eye can resolve (60 pixels/deg). We here novel advanced optical design approaches that dramatically increase of keeping large FoV required in applications. This approach be applied to a vast number architectures, including some configurations, as multichannel designs. All this done at stage, and no tracker needed headset.

We present novel ultracompact advanced optical designs for VR HMD’s with a large field of view (> 90 deg) based on multi-channel freeform optics an excellent image quality designed adapted to the human vision.

Development of a novel HCPV nonimaging concentrator with high concentration (>500x) and built-in spectrum splitting concept is presented. It uses the combination commercial GaInP/GaInAs/Ge 3J cell Back-Point-Contact (BPC) silicon for efficient spectral utilization, external confinement techniques recovering cell's reflection. The primary optical element (POE) flat Fresnel lens secondary (SOE) free-form RXI-type band-pass filter embedded in it - Both POE SOE performing Köhler integration to...

With the increasing interest in using freeform surfaces optical systems due to novel application opportunities and manufacturing techniques, new challenges are constantly emerging. Optical have traditionally been circular apertures, but types of call for different aperture shapes. First non-circular shape that one can be interested tessellation or various folds is rectangular one. This paper covers comparative analysis a simple local optimization design example orthogonalized representations...

Compacting devices is an increasingly demanding requirement for many applications in both nonimaging and imaging optics. "Compacting" means here decreasing the volume of space between entry exit aperture without optical performance. For systems, compact optics mainly important reducing cost. Its small less material needed mass-production size light weight save cost transportation. addition to mentioned advantages, increases portability as well, which contributes a lot wearable display...

Two quasi-aplanatic free-form solid V-groove collimators are presented in this work. Both optical designs originally designed using the Simultaneous Multiple Surface method three dimensions (SMS 3D). The second optically active surface both devices is a posteriori as grooved surface. First two mirror (XX) design order to clearly show procedure and working principle of these devices. Second, RXI comparable with existing collimators; it compact highly efficient made polycarbonate (PC)...

Concentration Photovoltaics (CPV) is one of the most promising areas for competitive solar electricity production. This promise relies upon use high-efficiency triple-junction cells (which already have proven efficiencies over 41%) and advanced optics designs, which allow high concentration concurrent with manufacturing tolerances, both key elements low cost mass In this paper we will present progress in development CPV optical designs at present. These are based on free-form using Köhler...

It is well known that the response of any photovoltaic solar cell dependent on spectral characteristics incident radiation. This dependency crucial in output a multijunction (MJ) where composition radiation determines overall photocurrent produced, as either top or middle subcell will be limiting its response. The current mismatching between and translated into energy losses, affecting yield system. For research commercial purposes it interesting to measure accurately MJ cell, terms...

A metal-less RXI collimator has been designed. Unlike to the conventional collimators, whose back surface and central part of front have be metalized, this does not include any mirrored surface. The is designed as a grooved providing two TIR reflections for all rays impinging on it. main advantage presented design lower manufacturing cost since there no need expensive process metalization. Also, unlike collimators performs good colour mixing. first prototype V-groove made PMMA by direct...

Manufacturing technologies as injection molding or embossing specify their production limits for minimum radii of the vertices draft angle demolding, instance. In some demanding nonimaging applications, these restrictions may limit system optical efficiency affect generation undesired artifacts on illumination pattern. A novel manufacturing concept is presented here, in which surfaces are not obtained from usual revolution symmetry with respect to a central axis (z axis), but they calculated...

A metal-less RXI collimator has been designed using the Simultaneous multiple surface method (SMS). The is completely made of plastic (PMMA) and does not include any mirrored surface, unlike to convectional collimators, whose back metalized provide a specular reflection. V-groove as grooved providing two TIR reflections for all rays impinging on it. main advantage presented design lower manufacturing cost since there no need expensive process metalization. Also, conventional collimators this...

An advanced CPV concentrator with a Fresnel primary and refractive secondary produces both high concentration tolerance an excellent light homogenization. It compares well conventional Fresnel-based from optical cost standpoints.

It is essential to obtain high values of tolerance for CPV concentrators because manufacturing process always implies some accuracy errors. This paper presents the Fresnel Köhler concentrator (FK), an advanced optical comprising a lens as primary element and refractive secondary element, both presenting free-form surfaces. optic produces both, desired light concentration (i.e. acceptance angle), well excellent homogenization by integration simultaneously. A comparison between FK other...

We present an advanced optical design for a high-resolution ultra-compact VR headset high-end applications based on multichannel freeform optics and 4 OLED WUXGA microdisplays developed under EU project LOMID [1]. Conventional systems in headsets require large distance between lenses displays that directly leads to the rather bulky heavy commercial we have at present. managed dramatically decrease required display size itself eye distance, making it only 36 mm (to be compared 60-75 most...

Metal grid lines are a vital element in multijunction solar cells order to take out from the cell generated photocurrent. Nevertheless all this implies certain shadowing factor and thus reflectivity on surface that lowers its light absorption. This produces loss electrical efficiency global energy production for CPV systems. We present here an optical design recovering portion of reflected light, leading system increase. new is based external confinement cavity, able redirect by towards...

Here we present a novel optical design of the high concentration photovoltaics (HPCV) nonimaging concentrator (>500x) with built-in spectrum splitting concept. The primary element (POE) is flat Fresnel lens and secondary (SOE) free-form RXI-type band-pass filter embedded in it, both POE SOE performing Köhler integration to produce light homogenization on target. It uses combination commercial GaInP/GaInAs/Ge 3J cell Back-Point-Contact (BPC) silicon for efficient spectral utilization,...