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Easy Java Simulations (2001- ) => Collaborative Community of EJS => Topic started by: lookang on March 20, 2009, 04:44:07 pm



Title: Ejs Open source java applet Blackbody Radiation Spectrum Model for nm
Post by: lookang on March 20, 2009, 04:44:07 pm
Ejs Open source java applet Blackbody radiation curves customised for nm written by Fu-Kwun Hwang and customized by Loo Kang WEE
Ejs Open source Blackbody radiation curves customised for nanometre nm  
 This applet will show 5(with temperature text) to 10(in total) black curves of black body radiation curve between Tmin and Tmax.
Minimum temperature shown can be adjusted with left slider bar, Tmin=
Another curve in red is also shown (it's temperature can be adjusted with middle slider bar), T= Maximum temperature shown can be adjusted with right slider bar, Tmax= You can use it for study the intensity for black body radiation. If you want to study different temperature range, You can change Tmin and Tmax, to change the temperature range,too, currently it is set to 100 K to 10000 K. The x-axis shows the wavelength ⋏ is in nanometre for prefix 10-9 SI units
the intensity is in W.e-5 / (m2.nm)
 The wavelength unit in the simulation is nm (nanometre), remixed from
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=427.msg3833#new for original Å (angstrom) version by Fu-Kwun Hwang.
Please note that this resource requires at least version 1.5 of Java (JRE).


reference:
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=427.msg3833#new for original Å (angstrom) version
[ejsapplet]

What is a blackbody radiation?
reference: http://en.wikipedia.org/wiki/Black_body
A black body is an idealized physical body that absorbs all electromagnetic radiation falling on it. Because of its perfect absorptivity at all wavelengths, a black body is also the best possible emitter of thermal radiation, which it radiates incandescently in a characteristic, continuous spectrum that depends on the body's temperature. At Earth-ambient, low temperatures this emission is in the infrared region of the electromagnetic spectrum and not visible, and therefore the object appears black, since it does not reflect or emit any visible light.
t is called blackbody radiation and has a distribution with a frequency maximum that shifts to higher energies with increasing temperature. As the temperature increases past a few hundred degrees Celsius, black bodies start to emit visible wavelengths, appearing red, orange, yellow, white, and blue with increasing temperature. By the time an object is visually white, it is emitting a substantial fraction as ultraviolet light.
(http://upload.wikimedia.org/wikipedia/commons/thumb/1/19/Black_body.svg/303px-Black_body.svg.png)
As the temperature decreases, the peak of the blackbody radiation curve moves to lower intensities and longer wavelengths. The blackbody radiation graph is also compared with the classical model of Rayleigh and Jeans.

How is it constructed?
The concept of the black body is an idealization, as perfect black bodies do not exist in nature. Graphite is a good approximation, however. Experimentally, blackbody radiation may be established best as the steady state equilibrium radiation in a rigid-walled cavity. A closed box of graphite walls at a constant temperature with a small hole on one side produces a good approximation to ideal blackbody radiation emanating from the opening.
(http://upload.wikimedia.org/wikipedia/commons/thumb/0/00/Blackbody-colours-vertical.svg/38px-Blackbody-colours-vertical.svg.png)


Title: Re: Blackbody radiation curves for different temperatures
Post by: lookang on March 20, 2009, 04:44:50 pm
think this is my latest file. will work it when time permits


Title: Re: Blackbody radiation curves for different temperatures
Post by: lookang on April 14, 2009, 10:18:21 pm
sort of completed customization to nano metre.
hopefully others will enjoy using this for learning especially A level Physics for a Data Analysis Problem that i encountered before.

If only i knew of the original applet, i would have planned a lesson using it

Thanks Prof Hwang!


Title: Re: Ejs Open source java applet Blackbody radiation curves customised for nm
Post by: lookang on July 31, 2009, 02:26:10 pm
http://www.compadre.org/osp/items/detail.cfm?ID=9307

This is cool!
i managed to submit this remix work as a collaboration to

Ejs Open source java applet Blackbody radiation curves customised for nm
written by Fu-Kwun Hwang and Mr WEE Loo Kang
Ejs Open source Blackbody radiation curves customised for nanometre nm

This applet will show six black curves of black body radiation curve between Tmin and Tmax.
Another curve in red is also shown (it's temperature can be adjusted with left slider bar)
Maximum wavelength shown can be adjusted with right slider bar.
You can use it for study the intensity for black body radiation.
If you want to study different temperature range, You can change Tmin and Tmax, to change the temperature range,too.
The wavelength unit in the simulation is nm (nanometre).

Please note that this resource requires at least version 1.5 of Java (JRE).
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1037.0
View the source code document attached to this resource

    * Ejs Open source java applet Blackbody radiation curves customised for nm Source Code
      Source Code for the Ejs Open source java applet Blackbody radiation curves customised for nm program.

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There is even a citation quote"

APA Format
Hwang, F., & Loo Kang, W. (2009). Ejs Open source java applet Blackbody radiation curves customised for nm [Computer software]. Retrieved July 31, 2009, from http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1037.0

Fantastic! but the auto-generated names is not so correct.
think i need to re-edit my details


Title: Re: Ejs Open source java applet Blackbody radiation curves customised for nm
Post by: lookang on September 03, 2009, 11:00:25 am
It is ready at OSP comPADRE collection .
Followed the html description as advised by Prof Wolfgang. The version uploaded above now the same as the OSP version.

Blackbody Radiation Spectrum
The Blackbody Radiation Spectrum model shows six fixed-temperature curves between Tmin and Tmax and a red variable-temperature curve that can be adjusted using a slider. The wavelength is measured in nm (nanometer) and the intensity is measured in W.e-5 / (m2.nm). Users can adjust Tmin and Tmax to change the temperature range that is displayed.
Credits:
The Blackbody Radiation Spectrum model was created by created by Fu-Kwun Hwang, customized by Loo Kang WEE, and edited by Wolfgang Christian using the Easy Java Simulations (EJS) version 4.2 authoring and modeling tool.  An applet version of this model is available on the NTNU website < http://www.phy.ntnu.edu.tw/ntnujava/ >.
You can examine and modify this compiled EJS model if you run the model (double click on the model's jar file), right-click within a plot, and select "Open EJS Model" from the pop-up menu.  You must, of course, have EJS installed on your computer.  Information about EJS is available at: and in the OSP comPADRE collection .


Title: Re: Ejs Open source java applet Blackbody Radiation Spectrum Model for nm
Post by: lookang on December 22, 2009, 05:27:29 pm
There is other similar applets that i encountered.

http://webphysics.davidson.edu/alumni/MiLee/java/bb_mjl.htm by Mike Lee & Wolfgang Christian.
http://webphysics.davidson.edu/Applets/BlackBody/BlackBody.html by Wolfgang Christian.
Like: the composite colors



http://phet.colorado.edu/simulations/sims.php?sim=Blackbody_Spectrum by University of Colorado - Michael Dubson, Kathy Perkins & Wendy Adams
(http://phet.colorado.edu/sims/blackbody-spectrum/blackbody-spectrum-screenshot.png)
Like: fantastic, worksheets from contributors

http://www.compadre.org/osp/items/detail.cfm?ID=10528&S=2 (http://www.compadre.org/profiles/blackbody1.jpg)
Blackbody Radiation: Frequency and Wavelength written by Jose Ignacio Fernández Palop
Like: the context of the black body diagram and the resultant color


Title: Re: Ejs Open source java applet Blackbody Radiation Spectrum Model for nm
Post by: lookang on December 31, 2010, 10:57:28 am
changes
before 2010 cannot remember but the source is still http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=175.0

add blue green red and actual visualization codes adapted from http://www.compadre.org/osp/items/detail.cfm?ID=10528&S=2
Blackbody Radiation: Frequency and Wavelength written by Jose Ignacio Fernández Palop
add menu list inspired by http://phet.colorado.edu/simulations/sims.php?sim=Blackbody_Spectrum by University of Colorado - Michael Dubson, Kathy Perkins & Wendy Adams