Developing the Modular Background-Oriented Full-Scale Schlieren Technique

2011 ◽  
Author(s):  
Yu-Cheng Hung ◽  
Chien-Chih Chen ◽  
Shun-Chih Wang ◽  
Chen-Ching Ting
Keyword(s):  
Light Source ◽  
Full Scale ◽  
Schlieren Technique ◽  
Fluorescent Lamps

This article mainly presents the full-scale schlieren technique using modular background-oriented light source instead of the retroreflective method. Moveover, this article is also focused on investigating sensitivity influence of the cutoff light percentage by the cutoff grid. An unit background-oriented light source is composed of the fluorescent lamps of Philips-865, the atomizing film, and the linear grating mask in this work. The applied cutoff grids are with 50, 60, 70, 80, and 90% of the cutoff light percentage respectively. The results show that a cutoff grid with 90% cutoff light for the conventional Z-arrangement schlieren technique and a cutoff grid with 60% cutoff light for the full-scale schlieren technique receives the best visualization.

Developing the Color Full-Scale Schlieren Technique for Flow Visualization

2011 ◽  
Author(s):  
Chien-Chih Chen ◽  
Yu-Cheng Hung ◽  
Shun-Chih Wang ◽  
Chen-Ching Ting
Keyword(s):  
Flow Visualization ◽  
Light Source ◽  
Test Section ◽  
Combustion Process ◽  
High Sensitivity ◽  
Full Scale ◽  
Large Area ◽  
Fuel Gas ◽  
Schlieren Technique ◽  
Color Mask

The full-scale schlieren technique was famous and especially developed for flow visualization with large area of test section. This article further presents the color full-scale schlieren technique which captures more colorful images and also promotes the resolution of images. In this work, the developed color full-scale schlieren technique used the light source which penetrates through the linear grating color mask with alternated red, green, and blue colors. The applied light source is made of flat plate and with modular structure which is convenient for varying area of the light source. The width of the grating color lines is 6 mm. The applied area of light source and its test section are 2×2 and 1×1 m2 respectively. In future, this developed color full-scale schlieren technique will be further used for e.g. CO flow visualization during incomplete combustion process of fuel gas. The results in this work show beautiful images and also with expected high sensitivity.

scholarly journals INVESTIGASI PENGARUH TEMPERATUR WARNA BERKORELASI TERHADAP PERFORMA DSSC UNTUK SISTEM INDOOR SOLAR CELL

Jurnal Teknik ◽  
2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Muhammad Khairuddin ◽  
Indrawan Nugrahanto ◽  
Leonardo Kamajaya
Keyword(s):  
Solar Cell ◽  
Light Source ◽  
Color Temperature ◽  
Dye Sensitized Solar Cell ◽  
Pv System ◽  
Dye Sensitized ◽  
Fluorescent Lamps ◽  
Higher Power ◽  
Higher Temperature ◽  
Experimental Researches

This study proposes the best light source, based on its color temperature, to be installed for indoor photovoltaic (PV) system since the light source is very significant for indoor PV system and greatly affects the performance of Dye-Sensitized Solar Cell (DSSC). In outdoor PV system, the higher temperature in the environment gives a fine impact for DSSC’s performance. However, this trend is unclear in indoor PV system. Hence, some experimental researches, such as investigating the light properties and the performance of DSSC under fluorescent lamps FL865 with CCT 6500K and FL830 with CCT 3000K, will be carried out in order to find out a preferable luminaire between two for indoor PV system. The results show that a light source, FL830, with lower color temperature is better for DSSC’s outcome in indoor use. Since the lower CCT produced higher illuminance, intensity, and radiant power that make DSSC generated 2.28% higher power than the higher CCT.Keywords: DSSC, Color Temperature, Indoor Solar Cell(Penelitian ini mengusulkan sumber cahaya terbaik berdasarkan correlated color temperature (CCT) atau temperatur warnanya untuk digunakan pada sistem indoor solar cell karena sumber cahaya sangat mempengaruhi kinerja Dye-Sensitized Solar Cell (DSSC) yang digunakan pada sistem indoor solar cell. Dalam sistem solar cell di luar ruangan, suhu yang lebih tinggi di lingkungan memberikan dampak yang baik untuk kinerja DSSC. Namun, tren ini belum jelas jika DSSC digunakan di dalam ruangan. Oleh karena itu, beberapa penelitian eksperimental, seperti menyelidiki sifat cahaya dan kinerja DSSC di bawah lampu neon FL865 dengan CCT 6500K dan FL830 dengan CCT 3000K, akan dilakukan untuk menemukan luminer yang lebih unggul untuk sistem PV dalam ruangan. Hasilnya menunjukkan bahwa sumber cahaya, FL830, dengan temperatur warna (CCT) yang lebih rendah lebih baik untuk DSSC dengan penggunaan dalam ruangan. Karena CCT lebih rendah menghasilkan iluminasi, intensitas, dan daya pancaran yang lebih tinggi yang membuat DSSC mencapai kinerja yang lebih baik dengan menghasilkan daya 2.28% lebih tinggi dari CCT yang lebih tinggi.Kata Kunci: DSSC, Temperatur Warna, Solar Cell dalam Ruangan).

scholarly journals THE USE OF A MIX-450 MOBILE FORENSIC LIGHT SOURCE TO IDENTIFY CRIME TRACES

2020 ◽  
Vol 12 ◽  
pp. 3-5
Author(s):  
Olga A. Barinova ◽  
Keyword(s):  
Light Source ◽  
Human Skin ◽  
Luminous Flux ◽  
Biological Origin ◽  
Forensic Light Source ◽  
Fluorescent Lamps ◽  
Preliminary Examination ◽  
Forensic Tools ◽  
Material Evidence

One of the tasks of forensic science is to improve the tactics of conducting an inspection of the scene, which is largely associated with the use of modern technical and forensic tools used to detect, fix and seize traces and other material evidence in order to disclose and investigate a crime and establish the identity of the offender. However, as practice shows, the use of traditional technical means — portable sources of ultraviolet radiation to detect traces of biological origin (blood, semen, saliva and other human secretions) is not always effective. This is due to the fact that the intensity of the luminous flux of fluorescent lamps is quite low, which prevents the detection of traces during daylight hours. In addition, long-term illumination of the object, over 5 seconds, causes the destruction of the DNA in the blood and semen, which prevents the possibility of its further examination. At the same time, the arsenal of methods and technical means is constantly expanding. For example, a mobile forensic light source “MIKS-450” has now been developed. However, there is no information about the types of traces detected with its use. To fill this gap, the author of the article carried out a set of experiments, the results of which testify to the effectiveness of its use for detecting traces of human skin and preliminary examination of documents at the scene. The author also comes to the conclusion that the possibility of detecting traces of human skin depends on the physical properties of the trace substance (dirty or clean hands, dry or wet), the structure of the trace-sensing surface (smooth, rough), its color, as well as the time elapsed since the occurrence traces.

Effects of a new light source (cold cathode fluorescent lamps) on the growth of tree peony plantlets in vitro

2010 ◽  
Vol 125 (2) ◽  
pp. 167-169 ◽  
Author(s):  
Yi Ding ◽  
Songlin He ◽  
Jaime A. Teixeira da Silva ◽  
Gaoyan Li ◽  
Michio Tanaka
Keyword(s):  
Light Source ◽  
Cold Cathode ◽  
Tree Peony ◽  
Fluorescent Lamps

Performance of Arabidopsis thaliana under different light qualities: comparison of light-emitting diodes to fluorescent lamp

2017 ◽  
Vol 44 (7) ◽  
pp. 727 ◽  
Author(s):  
Karin Köhl ◽  
Takayuki Tohge ◽  
Mark Aurel Schöttler
Keyword(s):  
Arabidopsis Thaliana ◽  
Light Source ◽  
Light Emitting Diodes ◽  
Seed Mass ◽  
Fluorescent Light ◽  
Chlorophyll Fluorescence Parameters ◽  
Light Emitting ◽  
Led Light ◽  
Improve Energy Efficiency ◽  
Fluorescent Lamps

For precise phenotyping, Arabidopsis thaliana (L.) Heynh. is grown under controlled conditions with fluorescent lamps as the predominant light source. Replacement by systems based on light emitting diodes (LED) could improve energy efficiency and stability of light quality and intensity. To determine whether this affects the reproducibility of results obtained under fluorescent lamps, four Arabidopsis accessions and a phytochrome mutant were grown and phenotyped under two different LED types or under fluorescent lamps. All genotypes had significantly higher rosette weight and seed mass and developed faster under LED light than under fluorescent lamps. However, differences between genotypes were reproducible independent of the light source. Chlorophyll content, photosynthetic complex accumulation and light response curves of chlorophyll fluorescence parameters were indistinguishable under LED and fluorescent light. Principal component analysis of leaf metabolite concentrations revealed that the effect of a change from fluorescent light to LED light was small compared with the diurnal effect, which explains 74% of the variance and the age effect during vegetative growth (12%). Altogether, the replacement of fluorescent lamps by LED allowed Arabidopsis cultivation and reproduction of results obtained under fluorescent light.

scholarly journals Orientation of the snail Biomphalaria straminea (Dunker, 1848) in response to light in a situation of selection

1986 ◽  
Vol 81 (3) ◽  
pp. 255-263 ◽  
Author(s):  
Virginia T. Schall ◽  
Pedro Jurberg ◽  
Brani Rozemberg
Keyword(s):  
Light Source ◽  
Geographical Distribution ◽  
Social Factors ◽  
Behavioral Response ◽  
Natural Light ◽  
Fluorescent Lamps ◽  
Biomphalaria Straminea

The behavioral response of Biomphalaria straminea to light was evaluted in terms of location of the snail in a Y-shaped aquarium in a situation of selection and of the rate (cm/hour) and direction of locomotion under homogeneous 9vertical) or differential (horizontal) lighting upon only one arm of the aquarium. The light source consisted of daylight fluorescent lamps with a spectrum close to that of natural light, with illumination varying from 28 to 350 lux. Analysis of the data showed that all animals, whether in groups or isolated, were attracted to light, although the time needed to approach the light source was 50% shorter for the former than for the latter. The rate of locomotion of B. straminea was 35% higher than observed in B. glabrata and 51% higher than that observed in B. tenagophila studied under similar conditions. The results are discussed in terms of social factors and geographical distribution of the three species.

Performance of New Hybrid Solar Lighting Luminaire Design

Solar Energy ◽  
2003 ◽  
Author(s):  
Dennis D. Earl ◽  
L. Curt Maxey ◽  
Jeff D. Muhs ◽  
Robert R. Thomas
Keyword(s):  
Light Source ◽  
Intensity Distribution ◽  
Fiber Optic ◽  
Optical Elements ◽  
Optical Efficiency ◽  
Spatial Intensity Distribution ◽  
Spatial Intensity ◽  
Fluorescent Lamps ◽  
Quantitative Measurements ◽  
Solar Lighting

We report on the performance of a new hybrid luminaire designed to blend light from a fiber optic solar source with electric fluorescent lamps. The luminaire design studied involves a commercially-available fluorescent luminaire that had been modified to include optical elements for efficiently dispersing a fiber optic solar light source. Quantitative measurements of the hybrid luminaire’s optical efficiency and spatial intensity distribution/deviations are discussed. The effects of static differences and dynamic fluctuations in spatial intensity distribution are qualitatively discussed and potential design improvements examined.

scholarly journals Green-light Supplementation for Enhanced Lettuce Growth under Red- and Blue-light-emitting Diodes

HortScience ◽  
2004 ◽  
Vol 39 (7) ◽  
pp. 1617-1622 ◽  
Author(s):  
Hyeon-Hye Kim ◽  
Gregory D. Goins ◽  
Raymond M. Wheeler ◽  
John C. Sager
Keyword(s):  
Plant Growth ◽  
Light Source ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Green Light ◽  
Light Sources ◽  
Natural Setting ◽  
Light Emitting ◽  
Fluorescent Lamps ◽  
Green Fluorescent

Plants will be an important component of future long-term space missions. Lighting systems for growing plants will need to be lightweight, reliable, and durable, and light-emitting diodes (LEDs) have these characteristics. Previous studies demonstrated that the combination of red and blue light was an effective light source for several crops. Yet the appearance of plants under red and blue lighting is purplish gray making visual assessment of any problems difficult. The addition of green light would make the plant leave appear green and normal similar to a natural setting under white light and may also offer a psychological benefit to the crew. Green supplemental lighting could also offer benefits, since green light can better penetrate the plant canopy and potentially increase plant growth by increasing photosynthesis from the leaves in the lower canopy. In this study, four light sources were tested: 1) red and blue LEDs (RB), 2) red and blue LEDs with green fluorescent lamps (RGB), 3) green fluorescent lamps (GF), and 4) cool-white fluorescent lamps (CWF), that provided 0%, 24%, 86%, and 51% of the total PPF in the green region of the spectrum, respectively. The addition of 24% green light (500 to 600 nm) to red and blue LEDs (RGB treatment) enhanced plant growth. The RGB treatment plants produced more biomass than the plants grown under the cool-white fluorescent lamps (CWF treatment), a commonly tested light source used as a broad-spectrum control.

Process Optimization and Application of Supported Nano-Photocatalytic Materials

2011 ◽  
Vol 287-290 ◽  
pp. 235-238 ◽  
Author(s):  
Shui Jing Gao ◽  
Wen Li Zhang ◽  
Gui Qin Hou
Keyword(s):  
Photocatalytic Degradation ◽  
Light Source ◽  
Process Optimization ◽  
Porous Glass ◽  
Splitting Method ◽  
Photocatalytic Efficiency ◽  
Catalyst Free ◽  
Fluorescent Lamps ◽  
Degradation Test ◽  
Melt Phase

Melt Phase-splitting[1] method was a new one of preparing supported nano-photocatalytic materials.The nano TiO2 prepared loaded to the porous glass carrier. In this study,the technology of preparing nano TiO2 by melt phase-splitting method was Optimization, also doing doping modifcation on them. Using nano TiO2 photocatalyst to do photocatalytic degradation test on formaldehyde.The result had shown that: the degradation efficiency of the catalyst containing ZnO was higher than that free of ZnO. The rate of degradation of formaldehyde of the catalyst free of ZnO could reached 58.7% in 8 hours, but that of the catalyst containing was only 53.3%. Using fluorescent lamps as the light source,the photocatalytic efficiency of the catalyst free of ZnO could reached 43.2%.

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