Bibliographies thématiques / High light illumination

Littérature scientifique sur le sujet « High light illumination »

Auteur : Grafiati
Publié le 11 mars 2023

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Articles de revues sur le sujet "High light illumination"

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Shi, Fenghua, Jing Wen et Dangyuan Lei. « High-efficiency, large-area lattice light-sheet generation by dielectric metasurfaces ». Nanophotonics 9, no 12 (29 juin 2020) : 4043–51. http://dx.doi.org/10.1515/nanoph-2020-0227.

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AbstractLattice light-sheet microscopy (LLSM) was developed for long-term live-cell imaging with ultra-fine three-dimensional (3D) spatial resolution, high temporal resolution, and low photo-toxicity by illuminating the sample with a thin lattice-like light-sheet. Currently available schemes for generating thin lattice light-sheets often require complex optical designs. Meanwhile, limited by the bulky objective lens and optical components, the light throughput of existing LLSM systems is rather low. To circumvent the above problems, we utilize a dielectric metasurface of a single footprint to replace the conventional illumination modules used in the conventional LLSM and generate a lattice light-sheet with a ~3-fold broader illumination area and a significantly leveraged illumination efficiency, which consequently leads to a larger field of view with a higher temporal resolution at no extra cost of the spatial resolution. We demonstrate that the metasurface can manipulate spatial frequencies of an input laser beam in orthogonal directions independently to break the trade-off between the field of view and illumination efficiency of the lattice light-sheet. Compared to the conventional LLSM, our metasurface module serving as an ultra-compact illumination component for LLSM at an ease will potentially enable a finer spatial resolution with a larger numerical-aperture detection objective lens.
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Yoshinobu, Tatsuo, et Ko-ichiro Miyamoto. « Efficient Illumination for a Light-Addressable Potentiometric Sensor ». Sensors 22, no 12 (16 juin 2022) : 4541. http://dx.doi.org/10.3390/s22124541.

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A light-addressable potentiometric sensor (LAPS) is a chemical sensor that is based on the field effect in an electrolyte–insulator–semiconductor structure. It requires modulated illumination for generating an AC photocurrent signal that responds to the activity of target ions on the sensor surface. Although high-power illumination generates a large signal, which is advantageous in terms of the signal-to-noise ratio, excess light power can also be harmful to the sample and the measurement. In this study, we tested different waveforms of modulated illuminations to find an efficient illumination for a LAPS that can enlarge the signal as much as possible for the same input light power. The results showed that a square wave with a low duty ratio was more efficient than a sine wave by a factor of about two.
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Hanji, Param, Muhammad Z. Alam, Nicola Giuliani, Hu Chen et Rafał K. Mantiuk. « HDR4CV : High Dynamic Range Dataset with Adversarial Illumination for Testing Computer Vision Methods ». Journal of Imaging Science and Technology 65, no 4 (1 juillet 2021) : 40404–1. http://dx.doi.org/10.2352/j.imagingsci.technol.2021.65.4.040404.

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Abstract Benchmark datasets used for testing computer vision (CV) methods often contain little variation in illumination. The methods that perform well on these datasets have been observed to fail under challenging illumination conditions encountered in the real world, in particular, when the dynamic range of a scene is high. The authors present a new dataset for evaluating CV methods in challenging illumination conditions such as low light, high dynamic range, and glare. The main feature of the dataset is that each scene has been captured in all the adversarial illuminations. Moreover, each scene includes an additional reference condition with uniform illumination, which can be used to automatically generate labels for the tested CV methods. We demonstrate the usefulness of the dataset in a preliminary study by evaluating the performance of popular face detection, optical flow, and object detection methods under adversarial illumination conditions. We further assess whether the performance of these applications can be improved if a different transfer function is used.
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Feng, Di, Jaehwan Yoo, Kaname Nagatani, Wookyu Kim et HyeongChae Kim. « High Illumination Efficiency Linear Light Source Using Light Emitting Diodes ». Japanese Journal of Applied Physics 46, no 2 (8 février 2007) : 563–65. http://dx.doi.org/10.1143/jjap.46.563.

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Curlin, Jahnavi, et Charles K. Herman. « Current State of Surgical Lighting ». Surgery Journal 06, no 02 (avril 2020) : e87-e97. http://dx.doi.org/10.1055/s-0040-1710529.

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AbstractSurgical performance in the operating room (OR) is supported by effective illumination, which mitigates the inherent environmental, operational, and visual challenges associated with surgery. Three critical components are essential to optimize operating light as illumination: (1) centering on the surgeon's immediate field, (2) illuminating a wide or narrow field with high-intensity light, and (3) penetrating into a cavity or under a flap. Furthermore, optimal surgical illumination reduces shadow, glare, and artifact in visualization of the surgical site. However, achieving these principles is more complex than at first glance, requiring a detailed examination of the variables that comprise surgical illumination. In brief, efficacious surgical illumination combines sufficient ambient light with the ability to apply focused light at specific operative stages and angles. But, brighter is not always merely better; rather, a nuanced approach, cognizant of the challenges inherent in the OR theater, can provide for a thoughtful exploration of how surgical illumination can be utilized to the best of its ability, ensuring a safe and smooth surgery for all.
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Rahman, Md Momtazur, David Luke Field, Soyed Mohiuddin Ahmed, Md Tanvir Hasan, Mohammad Khairul Basher et Kamal Alameh. « LED Illumination for High-Quality High-Yield Crop Growth in Protected Cropping Environments ». Plants 10, no 11 (16 novembre 2021) : 2470. http://dx.doi.org/10.3390/plants10112470.

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Vegetables and herbs play a central role in the human diet due to their low fat and calory content and essential antioxidant, phytochemicals, and fiber. It is well known that the manipulation of light wavelengths illuminating the crops can enhance their growth rate and nutrient contents. To date, it has not been easy to generalize the effects of LED illumination because of the differences in the plant species investigated, the measured traits, the way wavelengths have been manipulated, and the plants’ growing environments. In order to address this gap, we undertook a quantitative review of LED manipulation in relation to plant traits, focusing on vegetables and herbs. Here, we use standardized measurements of biomass, antioxidant, and other quantitative characteristics together with the whole range of the photosynthetic photon flux density (PPFD). Overall, our review revealed support for the claims that the red and blue LED illumination is more reliable and efficient than full spectrum illumination and increases the plant’s biomass and nutritional value by enhancing the photosynthetic activity, antioxidant properties, phenolic, and flavonoids contents. Although LED illumination provides an efficient way to improve yield and modify plant properties, this study also highlights the broad range of responses among species, varieties traits, and the age of plant material.
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Wang, Depeng, Suva Roy, Andra M. Rudzite, Greg D. Field et Yiyang Gong. « High-resolution light-field microscopy with patterned illumination ». Biomedical Optics Express 12, no 7 (8 juin 2021) : 3887. http://dx.doi.org/10.1364/boe.425742.

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Shao, Wei, Kaibin Liu, Yunqiu Shao et Awei Zhou. « Smooth Surface Visual Imaging Method for Eliminating High Reflection Disturbance ». Sensors 19, no 22 (14 novembre 2019) : 4953. http://dx.doi.org/10.3390/s19224953.

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At present, visual imaging is widely applied for surface defects such as bumps and scratches in the manufacture of precise parts with a highly reflective surface. However, the high light reflection and halo disturbance as a result of the illumination in visual imaging exert a direct influence on the accuracy of defect detection. In this regard, the present paper develops an adaptive illumination method based on space–time modulation for a visual imaging system. Furthermore, a digital micro-mirror device (DMD) is employed to realize the pixel-level spatiotemporal modulation of illumination. Then, in combination with the illumination intensity feedback of charge coupled device (CCD), the time-space ratio is adjusted automatically to achieve adaptive uniform illumination and effectively suppress the high light reflection and halo disturbance of highly reflective surfaces. The experimental results show that, in terms of restraining high light disturbance, the visibility and accuracy of visual imaging are improved.
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Ito, Yuhei, Kyouichi Suzuki, Tsuyoshi Ichikawa, Yoichi Watanabe, Taku Sato, Jun Sakuma et Kiyoshi Saito. « Intraoperative Fluorescence Cerebral Angiography by Laser Surgical Microscopy : Comparison With Xenon Microscopy and Simultaneous Observation of Cerebral Blood Flow and Surrounding Structures ». Operative Neurosurgery 16, no 6 (12 juin 2018) : 700–706. http://dx.doi.org/10.1093/ons/opy159.

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Abstract BACKGROUND Laser surgical microscopes should enable uniform illumination of the operative field, and require less luminous energy compared with existing xenon surgical microscopes. OBJECTIVE To examine the utility of laser illumination in fluorescence cerebral angiography. METHODS Fluorescein sodium (fluorescein) was used as a fluorescent dye. We first compared the clarity of cerebral blood flow images collected by fluorescence angiography between the laser illumination and xenon illumination methods. We then assessed use of the laser illuminator for simultaneous observation of blood flow and surrounding structures during fluorescence angiography. Furthermore, the study was designed to evaluate usefulness of the thus determined excitation light in clinical cases. RESULTS Fluorescence angiography using blue light laser for excitation provided higher clarity and contrast blood flow images compared with using blue light generated from a xenon lamp. Further, illumination with excitation light consisting of a combination of 3 types of laser (higher level of blue light, no green light, and lower level of red light) enabled both blood flow and surrounding structures to be observed through the microscope directly by the surgeon. CONCLUSION Laser-illuminated fluorescence angiography provides high clarity and contrast images of cerebral blood flow. Further, a laser providing strong blue light and weak red light for excitation light enables simultaneous visual observation of fluorescent blood flow and surrounding structures by the surgeon using a surgical microscope. Overall, these data suggest that laser surgical microscopes are useful for both ordinary operative manipulations and fluorescence angiography.
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Yabuuchi, Kento, Masahiro Hirano, Taku Senoo, Norimasa Kishi et Masatoshi Ishikawa. « Real-Time Traffic Light Detection with Frequency Patterns Using a High-Speed Camera ». Sensors 20, no 14 (20 juillet 2020) : 4035. http://dx.doi.org/10.3390/s20144035.

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LEDs are widely employed as traffic lights. Because most LED traffic lights are driven by alternative power, they blink at high frequencies, even at twice their frequencies. We propose a method to detect a traffic light from images captured by a high-speed camera that can recognize a blinking traffic light. This technique is robust under various illuminations because it can detect traffic lights by extracting information from the blinking pixels at a specific frequency. The method is composed of six modules, which includes a band-pass filter and a Kalman filter. All the modules run simultaneously to achieve real-time processing and can run at 500 fps for images with a resolution of 800 × 600. This technique was verified on an original dataset captured by a high-speed camera under different illumination conditions such as a sunset or night scene. The recall and accuracy justify the generalization of the proposed detection system. In particular, it can detect traffic lights with a different appearance without tuning parameters and without datasets having to be learned.
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Thèses sur le sujet "High light illumination"

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Greenup, Phillip John. « Development of Novel Technologies for Improved Natural Illumination of High Rise Office Buildings ». Thesis, Queensland University of Technology, 2004. https://eprints.qut.edu.au/15936/1/Philip_Greenup_Thesis.pdf.

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Effective daylighting can substantially reduce the energy use and greenhouse gas emissions of commercial buildings. Daylight is also healthy for building occupants, and contributes to occupant satisfaction. When productivity improvements are considered, effective daylighting is also highly attractive financially. However, successful daylighting of sub-tropical buildings is a very difficult task, due to high direct irradiances and excessive solar shading. A device was created that combined effective solar shading and efficient daylight redirection. The micro-light guiding shade panel achieves all objectives of an optimal daylighting device placed on the façade of a sub-tropical, high rise office building. Its design is based on the principles of non-imaging optics. This provides highly efficient designs offering control over delivered illumination, within the constraints of the second law of thermodynamics. Micro-light guiding shade panels were constructed and installed on a test building. The tested devices delivered daylight deep into the building under all conditions. Some glare was experienced with a poorly chosen translucent material. Glare was eliminated by replacing this material. Construction of the panels could be improved by application of mass-manufacturing techniques including metal pressing. For the micro-light guiding shade panel to be utilised to its full potential, building designers must understand its impact on building performance early in the design process. Thus, the device must be modelled with lighting simulation software currently in use by building design firms. The device was successfully modelled by the RADIANCE lighting simulator. RADIANCE predictions compared well with measurements, providing bias generally less than 10%. Simulations greatly aided further development of the micro-light guiding shade panel. Several new RADIANCE algorithms were developed to improve daylight simulation in general.
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Greenup, Phillip John. « Development of Novel Technologies for Improved Natural Illumination of High Rise Office Buildings ». Queensland University of Technology, 2004. http://eprints.qut.edu.au/15936/.

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Effective daylighting can substantially reduce the energy use and greenhouse gas emissions of commercial buildings. Daylight is also healthy for building occupants, and contributes to occupant satisfaction. When productivity improvements are considered, effective daylighting is also highly attractive financially. However, successful daylighting of sub-tropical buildings is a very difficult task, due to high direct irradiances and excessive solar shading. A device was created that combined effective solar shading and efficient daylight redirection. The micro-light guiding shade panel achieves all objectives of an optimal daylighting device placed on the façade of a sub-tropical, high rise office building. Its design is based on the principles of non-imaging optics. This provides highly efficient designs offering control over delivered illumination, within the constraints of the second law of thermodynamics. Micro-light guiding shade panels were constructed and installed on a test building. The tested devices delivered daylight deep into the building under all conditions. Some glare was experienced with a poorly chosen translucent material. Glare was eliminated by replacing this material. Construction of the panels could be improved by application of mass-manufacturing techniques including metal pressing. For the micro-light guiding shade panel to be utilised to its full potential, building designers must understand its impact on building performance early in the design process. Thus, the device must be modelled with lighting simulation software currently in use by building design firms. The device was successfully modelled by the RADIANCE lighting simulator. RADIANCE predictions compared well with measurements, providing bias generally less than 10%. Simulations greatly aided further development of the micro-light guiding shade panel. Several new RADIANCE algorithms were developed to improve daylight simulation in general.
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Allen, Steven C. « Illumination for the 21st Century : High Efficiency Phosphor-Converted Light-Emitting Diodes for Solid-State Lighting ». University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1186160915.

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Hudon, Matis. « Active illumination for high speed image acquisition and recovery of shape and albedo ». Thesis, Rennes 1, 2016. http://www.theses.fr/2016REN1S070/document.

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L'objectif de cette thèse est de tirer parti d'une illumination totalement ou partiellement contrôlée pour enrichir l'acquisition vidéo de contenus tel que la reconstruction de la forme et de l'apparence. Aujourd'hui de nombreux travaux ont tenté d'atteindre cet objectif. Certains utilisent une illumination contrôlée et séquentielle pour obtenir des reconstructions de haute qualité de la forme et de la réflectance. En revanche, ces méthodes requièrent des dispositifs coûteuses et/ou ne fonctionnent pas en temps réel. Dans cette thèse, nous visions un système d'acquisition à bas coût, rapide et mobile, qui se veut non-seulement le moins intrusif possible mais aussi simple d'utilisation. La première contribution présentée dans cette thèse est une application de la méthode bien connue, intitulée stéréo photométrie, à la vidéo. De plus, comme une fréquence de trame élevée est nécessaire à une telle application, nous proposons une méthode permettant l'utilisation d'une illumination séquentielle avec des caméras rapides de type "electronic rolling shutter". Malgré les résultats intéressants obtenus, la qualité des reconstructions de l'apparence et de la forme n'étaient pas à la hauteur de nos espérances. De plus, la stéréo photométrie est une méthode qui, de nature, n'est pas très adaptée aux applications visées dans cette thèse. Pour notre seconde contribution, nous proposons une méthode de reconstruction de la forme (géométrie) ainsi que de la réflectance diffuse à partir d'une image (d'une séquence) en utilisant un système de capture hybride composé d'un capteur de profondeur (Kinect), d'une caméra grand public et d'un flash. L'objectif est de montrer qu'en combinant une acquisition RGB-D (image couleur + profondeur) avec illumination séquentielle, on peut obtenir une reconstruction qualitative de la forme et de la réflectance d'une scène dans le cas où l'éclairage n'est pas connu. Un couple d'images est capturé : une image non flashée (image sous une illumination ambiante) et une image flashée. Une image dont l'illumination ne provient que du flash (image flash pure) peut être calculée en soustrayant l'image non flashée de l'image flashée. Nous proposons un nouvel algorithme temps réel, qui, basé sur un modèle local d'illumination de notre flash et de l'image flash pure, améliore l'information de forme fournie par le capteur de profondeur tout en retrouvant les informations de réflectance diffuse. Notre dernière contribution concerne la composition automatique d'éclairage. L'éclairage est un élément clé de la photographie. Les professionnels travaillent régulièrement avec des systèmes d'éclairage complexes afin de capturer directement des images esthétiques. Récemment, certains photographes ont tenté une nouvelle approche : plutôt que photographier une scène directement sous un éclairage complexe, ils capturent la scène sous plusieurs éclairages simples, permettant ainsi un post-traitement permettant combiner les différentes illuminations de la scène. Cette approche apporte une nouvelle dimensionnalité intéressante au post-traitement. Cependant la combinaison des images requiert des compétences en matière de photographie, et l'acquisition sous différentes conditions d'éclairage n'en est pas moins fastidieuse. Nous proposons une méthode totalement automatisée, qui, à partir d'un modèle 3D (forme et albedo) reconstruit à partir de capture d'une scène réelle, produit virtuellement les images correspondant aux différentes conditions d'éclairages. Ensuite, ces images sont combinées automatiquement, à l'aide d'un algorithme génétique, pour correspondre à un style d'éclairage fourni par l'utilisateur sous forme d'une image cible de son choix
The objective of this thesis is to take advantage of controlled illumination to enrich a video acquisition with shape and reflectance reconstructions. Today, a lot of works have tried to meet this objective. Some of them take advantage of sequential controlled illumintation to recover high quality shape and reflectance, however they either require a costly and very cumbersome fixed setup, and/or do not run in real-time. Our aim is a low cost, fast, mobile and simple acquisition setup which has to be the less intrusive possible so as to provide a greater ease of use. The first contribution of this thesis focuses on the application of the well known photometric stereo method to a video acquisition. Moreover, as a high frame rate is required by such an application, a method using sequential illumination with high frame rate cameras (electronic rolling shutter cameras) is also considered. Despite the interesting results provided by photometric stereo, we found that this latter did not provide enough qualitative results. Moreover, by its nature, photometric stereo is not really suitable for the range of applications targeted. We propose, as a second contribution, a method for recovering the shape (geometry) and the diffuse reflectance from an image (or video) using a hybrid setup consisting of a depth sensor (Kinect), a consumer camera and a partially controlled illumination (using a flash). The objective is to show how combining RGB-D acquisition with a sequential illumination is useful for shape and reflectance recovery. A pair of two images are captured : one non flashed (image under ambient illumination) and a flashed one. A pure flash image is computed by subtracting the non flashed image from the flashed image. We propose a novel and near real-time algorithm, based on a local illumination model of our flash and the pure flash image, to enhance geometry (from the noisy depth map) and recover reflectance information. Finally, our last contribution concerns an automatic method for light compositing, using rendered images. Lighting is a key element in photography. Professional photographers often work with complex lighting setups to directly capture an image close to the targeted one. Some photographers reversed this traditional workflow. Indeed, they capture the scene under several lighting conditions, then combine the captured images to get the expected one. Acquiring such a set of images is a tedious task and combining them requires some skill in photography. We propose a fully automatic method, that renders, based on a 3D reconstructed model (shape and albedo), a set of images corresponding to several lighting conditions. The resulting images are combined using a genetic optimization algorithm to match the desired lighting provided by the user as an image
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Kubela, Petr. « Analýza tvorby třísky pomocí digitální vysokorychlostní kamery ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228890.

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In live we often involve monitoring of very fast actions, that are not observable by the human eye. The thesis focuses on possibilities of high speed digital cameras, their application in industry, and the mechanism of chip formation. The experiment part aims to record the chosen process of chip machining and the problems of necessary illumination during the process of object imaging.
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Chaisakul, Papichaya. « Ge/SiGe quantum well devices for light modulation, detection, and emission ». Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00764154.

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This PhD thesis is devoted to study electro-optic properties of Gemanium/Silicon-Germanium (Ge/SiGe) multiple quantum wells (MQWs) for light modulation, detection, and emission on Si platform. It reports the first development of high speed, low energy Ge/SiGe electro-absorption modulator in a waveguide configuration based on the quantum-confined Stark effect (QCSE), demonstrates the first Ge/SiGe photodiode with high speed performance compatible with 40 Gb/s data transmission, and realizes the first Ge/SiGe light emitting diode based on Ge direct gap transition at room temperature. Extensive DC and RF measurements were performed on each tested prototype, which was realized using the same epitaxial growth and fabrication process. Simple theoretical models were employed to describe experimental properties of the Ge/SiGe MQWs. The studies show that Ge/SiGe MQWs could potentially be employed as a new photonics platform for the development of a high speed optical link fully compatible with silicon technology.
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CHEN, SHR-HSUAN, et 陳仕軒. « High-efficiency optical couplers for Natural Light Illumination System ». Thesis, 2018. http://ndltd.ncl.edu.tw/handle/vd6yr8.

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碩士
國立臺灣科技大學
電子工程系
106
Due to the increasing global warming phenomenon in recent years, We need to reduce energy waste at present and find new energy sources to reduce the pollution to the environment for the sustainable development of mankind in the future, and solar energy is one of renewable energy. Many scholars have joined the development of sunlight. Among them, research has introduced natural light into the interior as a lighting and proposed the design of a Natural Light Illumination System(NLIS), which is beneficial to reduce the use of artificial lighting and lighting comfort requirements. The NLIS is composed of a light collecting, light transmitting, and light emitting subsystem. The collecting light system transmits the collected sunlight to the indoor light emitting subsystem through the light transmitting subsystem for green lighting. The system does not require additional energy conversion. It can effectively reduce the electricity consumption in the room. In the traditional Natural Light Illumination System, the light brick module light is transmitted by the optical fiber. However, the light brick module has four light exit ports, which require eight fibers to be coupled, and it is difficult to guide a large number of fibers to the erection. At the same time, it is easy to bend the fiber, which will cause the efficiency to drop. This study proposes an optical coupler that would improves the couple efficiency of the daylight collecting module in the Natural Light Illumination System. It uses the law of total reflection and double paraboloid confocal to compress the light twice and combine it for the light exit. We use this concept to reduce the use of fiber and indirectly improve the overall efficiency. Our simulation results show that the multi-stage series connection still has 66% efficiency at the 5th stage, and the new coupler effectively raises the tolerance angle. The coupler which used Natural Light Illumination System light source maintain 76%, it is 27% more efficient than the old coupler, and has an outstanding efficiency compared to the old coupler.
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Peng, Bo-Hen, et 彭柏翰. « Optical Design of High Power Light Emitting Diode for Illumination ». Thesis, 2008. http://ndltd.ncl.edu.tw/handle/48896584882384361447.

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碩士
國立清華大學
動力機械工程學系
96
In this study, an optical design of the high power light emitting diode (HP LED) for illumination is proposed. A simplified structure of the LED that can use the lens to replace the reflector cup is designed. Therefore, the fabrication cost can be reduced. According to this design concept, a design method of the optical lens is developed. Based on the proposed method, an optical lens of the front-emitting HP LED to obtain a uniform illumination, and reduce the injured of the glare is designed. An optical model is used to obtain the overall point data of the lens profile by mathematics and geometrical optics base on the optical requirement. Either the straight lines or curves are used to draw the lens profile, and then rotate around the central axle to create the 3D optical model. In addition, the several lenses with same form but different scale are analyzed to find the optical properties of each lens in order to select a suitable size of the lens. The emission pattern of the lens is used to adjust the lens profile and each lens profile is analyzed to search the optimization lens profile by the uniformity of the illumination. Finally, an optical lens model with excellent illumination uniformity is found.
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Huang, Jian-li, et 黃建歷. « Optical Design of High-Power White-Light LEDs for Illumination ». Thesis, 2009. http://ndltd.ncl.edu.tw/handle/34609764851758954337.

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碩士
國立臺灣科技大學
電子工程系
97
White light LEDs have more advantages than those of traditional incandescent lamps and the fluorescent lamps; e.g. high stability, long life time and low power consuming etc. Therefore, white light LEDs have been regarded as the most potential light source of solid-state lighting (SSL) in the future. In this thesis, we focus on the white light LED optical design and illumination analyses. For the optical design issue, our purpose is to design a 300-Lux lamp on the work plane which is 2 meter away with LED with 4 square meters in size plane and has uniformity illumination. The luminous intensity distribution curve shape is a batwing distribution and the maximum luminous intensity around 27° which compares with 0° approximately is 0.71. We focus on the design of LED lens using the LightTools software to improve the light distribution of white light LED. After the luminous intensity distribution curve design is completed, the lamp needs nine LEDs to enable the work plane approximately to have 300 Lux. Next, we optimize the lamp to enhance the uniformity illumination on the work plane. The uniformity illumination is promoted to 0.9. For the illumination analysis issue, we use the LED lamp and the fluorescent lamp in the indoor space making the comparison. According to the comparison results, the utilization factor of the LED lamp is 0.682 higher than the utilization factor of the fluorescent lamp is 0.394. The LED lamp produces 100Lux which needs 2.29W is smaller than the fluorescent lamp produces 100Lux which needs 2.56W in the unit area (1m2). It proved that the LED lamp has low consumption when compares to that of the fluorescent lamp.
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Huang, Jhen-Ting, et 黃振庭. « Design of high efficiency Freeform collimator for light propagation in Natural Light Illumination System ». Thesis, 2017. http://ndltd.ncl.edu.tw/handle/8dw69p.

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碩士
國立臺灣科技大學
電子工程系
105
In order to reduce the carbon dioxide emissions and reduce the level of global warming, renewable energy has become the development trend in which solar energy is inexhaustible. if the energy can be used not only save energy but also reduce carbon it will bring huge business opportunities. Therefore, National Taiwan University of Science and Technology Photonic Systems Simulation Design laboratory, PSSDL researches the sun into the indoor illumination for many years so that people will be able to enjoy healthy sunshine in the room and it can promote people's vitamin D and keep healthy both mentally and physically. Natural light illumination system is divided into four subsystems: pre-collecting, collecting, transmitting and irradiating. The pre-collecting track the sun which into the collecting system through the collecting system collects the next level of transmitting system and irradiating for indoor illumination. Due to the collecting system will continue reflection and refraction at interior cause scattered light as well as make the overall efficiency of the Natural Light Illumination System(NLIS) is not very well. In this paper, we design method of a free-form collimator is proposed. After Fresnel depletion, the strongest and sub-strong energy is selected. The collimator is designed by using the programmed grid cutting method and selecting complex light source is collimated by the slope of light spot with Cubic spline curve fitting also improve previously the efficiency of Natural light illumination system. Taking the freeform collimator of the 18496(1362) cutting grid as an example, the efficiency is 39.15% below 100 meters and compared to commercially available plastic fiber of PMMA materials, is up to about 39.08%.
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Livres sur le sujet "High light illumination"

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The High Country Illuminator : A Tale of Light and Darkness and the Ski Bums of Avalon. CreateSpace Independent Publishing Platform, 2013.

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Chapitres de livres sur le sujet "High light illumination"

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Kumar, Sudhir, Jwo-Huei Jou, Chun-Yu Hsieh, Yung-Cheng Jou et Jing-Ru Tseng. « An Energy Efficient and High Color Rendering Index Candle Light-Style Organic Light Emitting Diode for Illumination ». Dans Physics of Semiconductor Devices, 919–21. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03002-9_237.

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Sakuma, Ichiro, Toshiki Kobayashi, Hiroshi Seno, Yuki Akagi, Keiichi Nakagawa, Masatoshi Yamazaki et Naoki Tomii. « Application of Structured Light Illumination and Compressed Sensing to High Speed Laminar Optical Fluorescence Tomography ». Dans IFMBE Proceedings, 1216–19. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-30648-9_158.

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Sakuma, Ichiro. « Optical Fluorescence : Application of Structured Light Illumination and Compressed Sensing to High-speed Laminar Optical Fluorescence Tomography ». Dans Multidisciplinary Computational Anatomy, 349–53. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4325-5_47.

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Fukumoto, Kiyotaka, Yoshinobu Ebisawa et Kohei Mochizuki. « Detection of Pupil and Corneal Reflection Using High-speed Camera for Gaze Detection Under Face Intense Illumination and a Solution of Glass Reflection Problem by Improving Light Source ». Dans Communications in Computer and Information Science, 475–80. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-21380-4_80.

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Voigt, Christian C., et Daniel Lewanzik. « Evidenzbasierter Fledermausschutz bei Beleuchtungsvorhaben im Außenbereich ». Dans Evidenzbasiertes Wildtiermanagement, 199–230. Berlin, Heidelberg : Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-65745-4_8.

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ZusammenfassungAus Sicht des Naturschutzes tangiert Lichtverschmutzung vor allem die Lebensräume von nachtaktiven Tieren, zum Beispiel die der Fledermäuse. Dieses Kapitel bietet eine strukturierte Übersicht darüber, in welchem Umfang sich Lichtverschmutzung auf Fledermäuse negativ auswirken kann und wie sich unter der Maßgabe des hohen nationalen und internationalen Schutzstatus von Fledermäusen dieser negative Einfluss von Lichtverschmutzung vermeiden oder reduzieren lässt. Die aktuellen Forschungsergebnisse zeigen, dass vor allem an solchen Orten Fledermäuse künstliches Licht meiden, an denen sie für Beutegreifer vorhersehbar anzutreffen sind. Hierzu zählen vor allem Quartieröffnungen und Trinkstellen sowie für einzelne Arten auch Flugkorridore. Bei der Jagd meiden vor allem waldbewohnende und langsam fliegende Arten künstliches Licht bei Nacht, während hingegen schnell fliegende Fledermausarten, die im offenen Luftraum oder an Randstrukturen (Waldränder, Häuserschluchten) nach Nahrung suchen, mitunter Insekten an Lichtquellen jagen. Als besonders wirksame Maßnahmen, um Fledermäuse vor Lichtverschmutzung zu schützen, sind an erster Stelle die Vermeidung von Lichtquellen, die Reduzierung der Lichtintensitäten und die Abblendung von Streulicht, insbesondere in der Nähe von Quartieren und an potenziellen Trinkstellen, zu nennen. Ein Rückbau von Beleuchtungsquellen an sensiblen Quartierstandorten oder Trinkstellen ist aus Sicht des Fledermausschutzes ratsam, ebenso eine Umstellung auf neue Beleuchtungstypen mit fokussiertem Lichtstrahl und ohne ultraviolettes (UV) Spektrum. Schattenspendende Vegetation kann einerseits das Streulicht reduzieren, andererseits aufgrund der höheren Insektenabundanz zu einer größeren Anlockwirkung von künstlichen Lichtquellen für einige relativ häufige Fledermausarten führen. Eine temporäre Beleuchtung zu Beginn der Nacht wirkt sich unterschiedlich auf verschiedene Fledermausarten aus; vermutlich in Abhängigkeit von ihrem nächtlichen Jagdrhythmus. In ähnlicher Weise könnte eine durch Bewegungsmelder gesteuerte Beleuchtung besonders in wenig frequentierten Gegenden zur Reduzierung von Lichtverschmutzung beitragen, wobei die Auswirkungen einer solchen Steuerung auf Fledermäuse noch nicht im Detail erforscht sind. Eine Beleuchtung von sensiblen Lebensräumen mit einem rötlichen oder orangefarbenen anstatt mit einem weißen Lichtspektrum könnte Dunkelkorridore erhalten und potenziell der Fragmentierung der Landschaft durch Lichtverschmutzung entgegenwirken.SummaryFrom a conservation point of view, light pollution is mostly affecting nocturnal animals, such as bats. This chapter provides a structured compilation about the extent at which light pollution impacts bats and how to avoid and mitigate the negative effects of light pollution on bats based on the high level of protection bats are benefiting from on the national and international scale. The recent literature demonstrates that bats are most affected by light pollution at places where they are most visible and well predictable for predators. This is most apparent for roost openings and drinking sites, and for some species as well for flight corridors. Most forest bats and slow-flying species avoid artificial light at night, whereas fast-flying bats foraging in the open space or at edges (forest edges or street ‘canyons’) may hunt insects at street lamps. The most efficient way to reduce the negative impact of artificial light at night on bats is to avoid its installation, to reduce its intensity or to avoid light scatter beyond the target area; particularly in the vicinity of daytime roosts and potential drinking sites. Removing light sources from sensitive roost or drinking sites seems advisable from the perspective of bat conservation. A transition of light sources to modern luminaires with a focused beam and without UV light serves bat conservation as well. On the one hand, vegetation may reduce the light scatter and thus help light sensitive species. On the other hand, vegetation may increase the overall abundance of insects and may thus make light sources attractive for bats when hunting for insects lured by street lanterns. A part-time lighting scheme affects bat species in a diverse manner, most likely reflecting to what extent the part-time lighting interferes with the activity rhythm of bats. Similarly, using motion-sensor-controlled lighting could reduce light pollution particularly in less frequented areas, although the effects of such an adaptive control have not been investigated in detail. Illuminating sensitive habitats with a red or orange instead of white lighting may preserve dark corridors and thus counteract the fragmentation caused by light pollution at the landscape level.
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Forrest, Stephen R. « Organic light emitters ». Dans Organic Electronics, 367–567. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198529729.003.0006.

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This chapter introduces the design and fundamental concepts of organic light emitting diodes (OLEDs) and organic semiconductor lasers (OSLs). The chapter begins by describing device architectures used in fluorescent, phosphorescent, and thermally assisted delayed fluorescent (TADF) devices. Device characterization for both white and monochromatic OLEDs with application to displays and white illumination sources is discussed. OLED displays are compared with liquid crystal displays, and quantification of perceived color and luminosity is described. Materials and layer structures leading to high efficiency even at high brightness where exciton annihilation dominates, is followed by a discussion of methods used to efficiently outcouple light from substrate, waveguide, and surface plasmon modes. A discussion of reliability, with particular emphasis of the relatively short operational lifetime of blue phosphorescent and TADF devices, is provided. The last section is devoted to optically pumped OSLs, along with limitations encountered in achieving electrically pumped organic laser diodes.
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Keiko Lima Fujita, Alessandra, Daniel José Chianfrome, Vinicius Sigari Moreira, Anderson Luiz Zanchin, Priscila Fernanda Campos de Menezes et Vanderlei Salvador Bagnato. « Anatomically Adjustable Device for Large-Area Photodynamic Therapy ». Dans Photodynamic Therapy - from Basic Science to Clinical Research [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.93917.

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The illumination system composed of LEDs is an anatomically adjustable device of high intensity that can be applied in different areas of the body. It can be applied in health care, as in the dermatological and esthetic treatments. The device improved the treatment of pathological diseases (e.g. actinic keratosis) since disseminated lesions were reached in a single application, thus reducing the time of the procedure and ensuring homogeneous light distribution. It was compared with a smaller and non-adjustable illumination device and evaluated in the treatment of actinic keratosis. The results showed its versatile application and a uniform adjustment to body curvatures.
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Ahmed, Faisal, Miguel Heredia Conde et Otmar Loffeld. « Bringing VLC into ToF imaging : Pseudo-Passive Indoor ToF Imaging ». Dans ATHENA Research Book, Volume 1, 231–35. University of Maribor Press, 2022. http://dx.doi.org/10.18690/um.3.2022.14.

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High power consumption is a fundamental problem in active Timeof-Flight (ToF) modalities in contrast with passive imaging modalities, particularly when the ToF camera is incorporated into low-power devices, i.e., smartphones. This work introduces a novel concept that provides ToF-based measurements of a scene by empowering the light-based communication infrastructure in bistatic configuration. This provides a potential platform due to the pervasive presence of modulated light sources in indoor infrastructure. In this context, we are attempting to use VLC infrastructure, which synergistically supports lighting and communication, as an opportunity illuminator to attain ToF sensing for free. Such capabilities are demonstrated by performing simulations based on continuous-wave (CW) ToF and pulse-based (PB) ToF sensing in a passive approach. The passive modality not only makes the need for illumination units futile in ToF cameras, but also, consequently, will reduce the power consumption and cost of the system.
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« Benthic Habitats and the Effects of Fishing ». Dans Benthic Habitats and the Effects of Fishing, sous la direction de M. P. STRAND. American Fisheries Society, 2005. http://dx.doi.org/10.47886/9781888569605.ch34.

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Laser-based underwater imaging sensors have been developed and matured in the last decade that provide high resolution optical imagery of the sea floor. Laser Line Scan (LLS) and Streak Tube Imaging Lidar (STIL) have been particularly successful. A prototype Fluorescence Imaging Laser Line Scan (FILLS) sensor has been deployed in several underwater environments, yielding highresolution (~1 cm pixel size) imagery of the associated benthic habitats. The prototype FILLS sensor illuminates the sea floor with 488 nm laser light, and constructs four independent images from light collected at 488 nm, 520 nm, 580 nm, and 685 nm, respectively. The 488 nm image is formed from elastically scattered light (i.e., light scattered with no change in photon energy), while the other images are formed by inelastically scattered light. (The FILLS sensor is routinely operated during nighttime hours so that ambient illumination is negligible). Fluorescence is the primary physical mechanism giving rise to the inelastically scattered light sensed by FILLS. Coral reef environments produce particularly strong (and spectacular!) fluorescence imagery. FILLS was developed primarily for the detection, classification, and identification of man-made objects in underwater environments. In addition it can serve admirably for the characterization of underwater habitats. Examples of FILLS imagery relevant to fish habitat evaluation will be presented.
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Yang, M. M., et M. Alexe. « Photoelectric Effects at Domain Walls ». Dans Domain Walls, 199–216. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198862499.003.0009.

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This chapter reviews the history and the state-of-the-art research of the ferroelectric photovoltaic effect, in particular the role of DWs. Over the last decade, the field of ferroelectric photovoltaic effect has been experiencing a significant revival. Ferroelectrics can spontaneously generate a short-circuit current under uniform illumination owing to the asymmetric momentum distribution of the nonequilibrium photo-excited carriers in the k-space, termed the bulk photovoltaic effect. In contrast to the conventional photovoltaic effect based on a gradient of the chemical potential, the ferroelectric photovoltaic effect exhibits distinctive features. Although the solar energy harvesting based on ferroelectric materials suffers a low power conversion efficiency due to their poor light absorption in the visible range and high resistance, the progress in oxide thin film growth has significantly promoted the efficiency of ferroelectric solar cells in recent years. Meanwhile, the coupling of light with intrinsic degrees of freedom offers a fertile and rich playground to explore the new functionalities of (multi-)ferroelectrics and to develop related applications. In this regard, light-induced reversible ferroelectric switching and domain wall motion have been recently achieved.
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Actes de conférences sur le sujet "High light illumination"

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Günther, Johannes, Ingo Wald et Hans-Peter Seidel. « Precomputed light sets for fast high quality global illumination ». Dans ACM SIGGRAPH 2005 Sketches. New York, New York, USA : ACM Press, 2005. http://dx.doi.org/10.1145/1187112.1187242.

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Romańczuk, Patryk, Marcin Pietrzycki, Jacek Źmojda, Marcin Kochanowicz et Dominik Dorosz. « Multimode tapered optical light pipe for illumination systems ». Dans XXXVI Symposium on Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments (Wilga 2015), sous la direction de Ryszard S. Romaniuk. SPIE, 2015. http://dx.doi.org/10.1117/12.2203489.

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Sprague, Robert A., William D. Turner, Mark S. Bernstein, David L. Steinmetz, David L. Hecht, Tibor Fisli, Joseph W. Kaminski et Russell B. Rauch. « High Performance TIR Spatial Light Modulator ». Dans Spatial Light Modulators and Applications. Washington, D.C. : Optica Publishing Group, 1988. http://dx.doi.org/10.1364/slma.1988.thc1.

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The TIR linear spatial light modulator, which has been discussed in a number of previous publications,1-4 is a VLSI-driven device which utilizes phase change in lithium niobate to achieve modulation of a line of light at a number of positions along a line. It does this by coupling fringing fields from a set of electrodes on a VLSI chip into the crystal and interacting with these fringing fields in a total internal reflection mode of illumination. The device is used to phase modulate the light and can be either directly read out or used in a Schlieren readout system to create intensity modulation. In this paper we present information on design, fabrication, and performance of a new high performance device which has 4735 elements and operates with a 256 MPixel/second data rate.
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Antonis, Piet, Dick de Boer, Rolf Koole, Simon Kadijk, Yun Li, Vincent Vanbroekhoven, Patrick Van De Voorde et Christoph G. A. Hoelen. « Progress in extremely high brightness LED-based light sources ». Dans Sixteenth International Conference on Solid State Lighting and LED-based Illumination Systems, sous la direction de Nikolaus Dietz et Ian T. Ferguson. SPIE, 2017. http://dx.doi.org/10.1117/12.2275253.

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Keomanee-Dizon, Kevin. « Single-objective selective-volume illumination microscopy enables high-contrast light-field imaging ». Dans Virtual 12th Light Sheet Fluorescence Microscopy Conference 2020. Royal Microscopical Society, 2020. http://dx.doi.org/10.22443/rms.lsfm2020.37.

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Krzesłowski, Jakub. « Image-based specular component estimation using structured light illumination ». Dans XXXVI Symposium on Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments (Wilga 2015), sous la direction de Ryszard S. Romaniuk. SPIE, 2015. http://dx.doi.org/10.1117/12.2205694.

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Canoglu, Ergun, Elsa Garmire, I. Lahiri, D. D. Nolte et M. R. Melloch. « Pre-illumination to Control The Active Trap Density in a Semi-Insulating MQW Device ». Dans Spatial Light Modulators. Washington, D.C. : Optica Publishing Group, 1997. http://dx.doi.org/10.1364/slmo.1997.smc.4.

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Semiconductor photorefractive quantum well devices are prime candidates for high speed real-time image processing applications because of their high speed, small thickness and large electro-optic nonlinearities1,2,3. When used in the Stark geometry, where a field is applied perpendicular to MQW layers, the optical nonlinearity arises from longitudinal field screening in the illuminated areas. Lateral spatial modulation of the field screening is translated to lateral spatial modulation of refractive index and absorption by the quantum confined Stark effect. Device performance is characterized by spatial resolution and sensitivity, both of which strongly depend on carrier transport. The spatial resolution decreases with increased lateral carrier transport4,5, while the sensitivity increases with increased longitudinal transport. Highly trapping materials have been successfully used to increase the device resolution down to 5-7 μm6,7.
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Hassebrook, Laurence G., Raymond C. Daley et William J. Chimitt, Jr. « Application of communication theory to high-speed structured light illumination ». Dans Intelligent Systems & Advanced Manufacturing, sous la direction de Kevin G. Harding et Donald J. Svetkoff. SPIE, 1997. http://dx.doi.org/10.1117/12.294447.

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Bai, Xiaofeng, Lei Yin, Yufeng Zhu, Yingping He, Zhuang Miao, Wen Hu, Zhipeng Hou et Hongli Shi. « High illumination resolution test of low-light-level image intensifier ». Dans ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, sous la direction de Benkang Chang et Hui Guo. SPIE, 2013. http://dx.doi.org/10.1117/12.2033671.

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Leng, Xue, et Jinhua Yang. « Light Illumination Information Extraction Method of High Dynamic Range Image ». Dans 2nd International Conference on Computer and Information Applications (ICCIA 2012). Paris, France : Atlantis Press, 2012. http://dx.doi.org/10.2991/iccia.2012.235.

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