sar computation

How to use openEMS. Discussion on examples, tutorials etc

Moderator: thorsten

xrhstos
Posts: 9
Joined: Sat 30 Mar 2013, 21:57

sar computation

Post by xrhstos » Sat 30 Mar 2013, 21:59

hi all, i am trying to do sar computation for the classic problem of a λ/2 dipole and a human head, but it seems tricky, is there any example i can find?

thorsten
Posts: 1393
Joined: Mon 27 Jun 2011, 12:26

Re: sar computation

Post by thorsten » Sun 31 Mar 2013, 13:26

Hi,

maybe on Tuesday (after the Easter holidays) I can send you an example how to do this.

Do you want to include a body model head? E.g. from the virtual family?
Or just a simple phantom?

In the next release I will have a lot of improvements in handling SAR and the virtual family models.
If you are interested I can create a nightly build for you (on Tuesday). Do you use Windows or Linux?

regards
Thorsten

xrhstos
Posts: 9
Joined: Sat 30 Mar 2013, 21:57

Re: sar computation

Post by xrhstos » Sun 31 Mar 2013, 14:20

i have only created a homogeneous sphere which is supposed to represent human brain, its a very simple modelling but i have to start with something simple :P
i would appreciate it a lot if you could provide me with some help :!: (windows)

thorsten
Posts: 1393
Joined: Mon 27 Jun 2011, 12:26

Re: sar computation

Post by thorsten » Tue 02 Apr 2013, 10:50

Hi,

I updated/rewritten my SAR test example and attached it.

I guess I will make this an official tutorial for this topic for the upcoming release.

Note:
- The dipole length depends on the frequency of interest (f0)
- The mesh auto-adepts to f0 & f_stop --> don't increase them too much or you have a very dense mesh
- The power budget (ratio between accepted and radiated+absorbed power) should stay within the acceptable +/-5% tolerance.

In the final version for v0.0.31, I will make the lumped port a 1D-box (aka no with of 0.2mm). But v0.0.30 doesn't support that.

Any feedback to improve etc. would be welcome.

regards
Thorsten
Attachments
Dipole_SAR.m
(5.46 KiB) Downloaded 366 times

xrhstos
Posts: 9
Joined: Sat 30 Mar 2013, 21:57

Re: sar computation

Post by xrhstos » Tue 02 Apr 2013, 22:02

many thanks!!!

xrhstos
Posts: 9
Joined: Sat 30 Mar 2013, 21:57

Re: sar computation

Post by xrhstos » Sat 06 Apr 2013, 15:31

i am also trying to add another sphere inside the big one so that i can see how it will change my results but it seems that it changes nothing...dont i just add another sphere inside the other? or do i have to do something else?

sebastian
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Re: sar computation

Post by sebastian » Sat 06 Apr 2013, 16:29

Did you specify a higher priority for the inner sphere?

xrhstos
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Joined: Sat 30 Mar 2013, 21:57

Re: sar computation

Post by xrhstos » Sat 06 Apr 2013, 19:12

for the big one i have prio 10 and i selected 11 for the inner on, is that what you mean?

sebastian
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Re: sar computation

Post by sebastian » Sat 06 Apr 2013, 19:22

Yes, that is correct. The permittivities are sufficient distinct to see the influence?

xrhstos
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Joined: Sat 30 Mar 2013, 21:57

Re: sar computation

Post by xrhstos » Sat 06 Apr 2013, 19:23

yes, i have 45 for the large one and 60 for the smaller one

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