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Light/Heating in tooth
Posted 2012/10/29 10:28 GMT-4 Version 4.2a 4 Replies
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I am currently trying to modelise the transformation of light into heat within a tooth. (You shine the tooth, and some light is transformed into heat by absorption)
I have succesfully succedeed to modelise that through absorption ans diffusion in the tooth, but my problem is to modelise the light coming on the tooth.
For the moment I have used a Dirichlet boundary condition saying I=Io on the surface, but it does not describe the propagation of the light through x and make the problem isotropic.
How would you modelise that incoming power propagating through x?
And I also have a second problem concerning the processing information. Indeed I need to know how much light has transformed intoheat, and so what I do is Heat= I in -Iout by doing an integration on the side of the tooth.
But it does not into account the reflexion/transmission, I would need only the transmitted power.
Any idea?
Cheers!
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you could check the Model library "laser heating of a wafer", before there where also a model with a 2D-axi laser penetration calculation, then a 3D heating model based on the penetration results of the 2D axi, mapped into 3D, and superposed on the full model. This then aconted for the exp(-k*z) penetration depth based on the materials and layers
A general remark, when you make such "cubic" geometries, you could also, in the newer v4 versions make them directly by a block/rectangle, and a series of Layers (see the layer tab) even if you create some internal boundaries like that it's of little importance for the model complexity, and often the meshing goes quicker
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Good luck
Ivar
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I just need to get the laser liscence now!
Thanks a lot,
Benoit
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I cannot remmeber if its from the HT or the RF, but I would rather go for the Heat transfer module. Many older library models are not (yet) updated, so sometimes it's worth to ask your local rep if they have a model to illustrate a specific domain.
I believe there are some 500+ models in 4.3a but the COMSOL developpers must have several tousands at hand, I believe they have problems to update and check them quickly enough ;)
Do not forget the model gallery
Check this one www.comsol.eu/showroom/gallery/699/
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Good luck
Ivar
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I'm still working on that model, andI would like to extract the amount of heat that has been dissipated (actually the percentage, but whatever), but I have not found a good method yet (For the moment I do a model with/without absorption and compare the integration of thepower on the sides of the tooth).
Any idea?
Thank you very much!