scholarly journals Study on the Validity of Wien’s Displacement Law on Tungsten Bulb

2020 ◽  
Vol 6 (2) ◽  
pp. 85-96
Author(s):  
R. Neupane
Keyword(s):  
Total Energy ◽  
Direct Consequence ◽  
Infrared Region ◽  
Emission Wavelength ◽  
Spectral Radiance ◽  
Tungsten Filament ◽  
Peak Emission Wavelength ◽  
Spectrum Curve ◽  
Peak Emission

This work was mainly based on three interdependent parameters, which are temperature, emissivity and peak emission wavelength. Temperature is the primary parameter that determines how much light the filament gives off, and at what wavelengths. The work was focused on temperature determination of tungsten filament with different values of emissivity. The different values of emissivity taken for the work were 0.433, 0.431, 0.427, 0.421 and 0.415. Peak emission wavelength was calculated at different tungsten temperatures for different wattage bulbs which was in the order of 10-6m. 6, 60, and 500 watt bulb were taken for the work. The peak of the spectrum lay in the infrared region. Wien’s displacement law was used to calculate the value of peak emission wavelength. The work was based on theoretical model. Blackbody spectrum curve was used to analyze the emitted radiations from the bulb. In each spectrum curve, radiations having higher wavelengths were emitted in greater amount than the radiations having lower wavelength. Spectral radiance was found to be dependent upon both emissivity and power of the bulb. The area under the blackbody spectrum curve indicated the total number of emitted radiations and hence the total energy radiated across all wavelengths. The total energy emitted from tungsten filament was found to be increased rapidly with temperature. Brightness of the bulb increased with the increase in temperature of the tungsten. The peak in the blackbody spectrum curve shifts towards left, when temperature increased. There is a direct consequence of the brightness of bulb with the peak emission wavelength.

scholarly journals Peak emission wavelength and fluorescence lifetime are coupled in far-red, GFP-like fluorescent proteins

PLoS ONE ◽  
2018 ◽  
Vol 13 (11) ◽  
pp. e0208075 ◽  
Author(s):  
Laura Canty ◽  
Santosh Hariharan ◽  
Qian Liu ◽  
Steven A. Haney ◽  
David W. Andrews
Keyword(s):  
Fluorescence Lifetime ◽  
Fluorescent Proteins ◽  
Emission Wavelength ◽  
Peak Emission Wavelength ◽  
Peak Emission

EBT3-based dosimeter in characterizing UVA–LEDs with lambertian radiation pattern

Sensor Review ◽  
2019 ◽  
Vol 39 (4) ◽  
pp. 433-438
Author(s):  
Ahmad Fairuz Omar ◽  
Wan Long Chiong ◽  
Wei Yee Tan ◽  
Jia Wen Wong
Keyword(s):  
Uv Radiation ◽  
Area Under The Curve ◽  
Emission Wavelength ◽  
Content Type ◽  
Peak Emission Wavelength ◽  
Uv Led ◽  
Radiation Output ◽  
Lower Accuracy ◽  
Half Angle ◽  
Peak Emission

Purpose This paper aims to propose an area under the curve model to represent ultraviolet (UV) exposure doses on EBT3 films (in mJ/cm2). The model was developed on a cross-section of the exposed films using visible absorbance method. Ultraviolet–A light emitting diodes (UVA–LEDs) with 20° and 60° half angle with distinctive peak emission wavelengths between 365 to 405 nm are used in this experiment. No similar experimental setup or findings have been reported thus far, though the various application of EBT3 for the measurement of solar UV (A + B) have been published since EBT3 is commercially available. Design/methodology/approach Two sets of UVA–LEDs were used as the UV radiation source in the experiment. The first set contains of four 5 mm low power UVA–LEDs with the 20° half angle and peak emission wavelength at 365, 375, 385 and 400 nm. The second set contains of five surface mount high power UVA–LEDs with the 60° half angle and peak emission wavelength at 365, 375, 385, 305 and 400 nm. The illumination setup for the two sets of LEDs is different between each other to obtain sufficient dose distribution on the films for spectroscopy analysis. This is due to the different illumination angle and irradiance intensity by each set of LEDs. Findings UV–LED with a peak emission of 365, 375 and 385 nm able to produce UV doses accurately measurable using EBT3 films, UVA–LEDs with peak emission at 395 nm and above produced much lower accuracy with R2. From both set of LEDs, it can be concluded that peak emission wavelength of UVA–LED does influence the discoloration of the films. Shorter wavelength (higher energy) of UVA–LEDs discolors EBT3 films much intense compared to longer wavelength for a given UV dose exposure. Originality/value Despite various practical applicability and advantages of UV–LEDs, there are still no standard methods in measuring UV–LED radiation output. The proposed approach not only allows us to obtain the dose of UV–LED, where the sensitivity of measurement is wavelength (energy) depended but also allows us to visually observe the illumination pattern of invisible UV radiation through the application of EBT3 films.

scholarly journals Spectral fundus autofluorescence peak emission wavelength in ageing and AMD

2021 ◽  
Author(s):  
Rowena Schultz ◽  
Linda Schwanengel ◽  
Daniel Meller ◽  
Martin Hammer
Keyword(s):  
Fundus Autofluorescence ◽  
Emission Wavelength ◽  
Peak Emission Wavelength ◽  
Peak Emission

A data-driven approach to predicting band gap, excitation, and emission energies for Eu2+-activated phosphors

2021 ◽  
Author(s):  
Chaewon Park ◽  
Jin-Woong Lee ◽  
Minseuk Kim ◽  
Byung Do Lee ◽  
Satendra Pal Singh ◽  
...  
Keyword(s):  
Band Gap ◽  
Band Edge ◽  
Emission Wavelength ◽  
Data Driven ◽  
Excitation Band ◽  
Peak Emission Wavelength ◽  
Data Driven Approach ◽  
Model Platform ◽  
Peak Emission

An integrated ML model platform is developed to predict the peak emission wavelength (PEW), excitation band edge wavelength (EBEW), and band gap (Eg) from structural, elemental, chemical, and physical descriptors of Eu2+-activated phosphors.

The Influence of the Hole Size on the Peak Emission Wavelength of a Plasmonic Thermal Emitter

2009 ◽  
Author(s):  
H. H. Chen ◽  
Y. W. Jiang ◽  
Y. T. Wu ◽  
Y. T. Chang ◽  
P. E. Chang ◽  
...  
Keyword(s):  
Emission Wavelength ◽  
Hole Size ◽  
Peak Emission Wavelength ◽  
Thermal Emitter ◽  
Peak Emission
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