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Normalized electrical field??

Posted 25 oct. 2010, 07:37 UTC−4 Version 4.3 2 Replies

Olivia Karlberg
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Hi!
I'm looking at modes in a waveguide. To obtain the electrical field of the diffrent modes COMSOL solves an eigenvalueproblem and gives me the egenfrequencis. But how does COMSOL normalize these diffrents modes. Does anybody knows how COMSOL normalizes??

Have a nice day!
/Olivia
2 Replies Last Post 30 nov. 2012, 14:51 UTC−5
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Hello Olivia Karlberg

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Ali Anderson
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Posted: 1 decade ago 30 nov. 2012, 12:34 UTC−5
I'm also looking for answers to this. Have you found anything after 2 years ? :D
I'm also looking for answers to this. Have you found anything after 2 years ? :D
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 30 nov. 2012, 14:51 UTC−5
Hi

the eigemfreuqnecy solvers have a few different ways to normalyse the mode shapes, but their absolute amplitudes are arbitrary, by the definition of the eigenmode solver process. At best one can compare the relative energy or amplitudes, its a qualitative way to look at the modes, no absolute measurements.

hence in solid a 10 um cantelever, might show up with 10 "m" aplitude displacement, this is not physicsal, but the relative shape remains still correct

--
Good luck
Ivar
Hi the eigemfreuqnecy solvers have a few different ways to normalyse the mode shapes, but their absolute amplitudes are arbitrary, by the definition of the eigenmode solver process. At best one can compare the relative energy or amplitudes, its a qualitative way to look at the modes, no absolute measurements. hence in solid a 10 um cantelever, might show up with 10 "m" aplitude displacement, this is not physicsal, but the relative shape remains still correct -- Good luck Ivar

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