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Blackbody Spectrum Viewer


Shodor > CSERD > Catalog > Blackbody Spectrum Viewer

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2 Published Reviews


ValidationReview by CSERD Reviewer
Published / Modified 195 months 22 days ago
The model correctly shows that as temperature rises, the most visible color shifts from red to blue. Due to the prism display and the intensity plot, I believe that this model plots the intensity and integrates the intensity over the visible spectrum to find the tristimulus coordinates, and then converts these coordinates to RGB values through a color profile conversion (most likely involving a white point transformation). The alternative method that this model may employ is by recording the percent of the intensity plot in the visible spectrum that represents blue colors (400nm), those that represent green (560nm), and those that represent red colors (700nm). A CIE plot would have more detailed ranges for each color. These percentages are then put together to find the RGB coordinates. In my relatively short period of time working on testing methods of validation I could not produce a valid model, because of this, I can't make any comments on the procedures. I can comment on the validity of the colors represented. The color produced at 2500 kelvin consistently differs from other unvalidated sources, such as http://webphysics.davidson.edu/alumni/MiLee/java/bb_mjl.htm, http://commons.wikimedia.org/wiki/Image:Color_temp2.png, and http://www.cs.bham.ac.uk/~mer/colour/bbody.jpg. This model will produce a red color for 2500 degrees kelvin, while other sources produce a much more orange color. As 2500K is more attainable in a lab than 5000K, I think someone more knowlegable with the colors of high temperature objects similar in properties to a blackbody would be able to discern which color was more accurite. But if other models are any indication, it would appear that the color is slightly off. Because of the immature science (and largely undocumented) behind calculating the temperature of a blackbody, I feel that this model does a good job of approximating color with temperature, particularly with temperatures greater than 2500 kelvin.
Usability of the resource: Usable

VerificationReview by Diane Mitchell
Published / Modified 195 months 22 days ago
Worked well, very straightforward.
Usability of the resource: Very usable
Platform(s) tested: winxp
Browser(s) tested: explorer

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