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penetrating microwave (high frequency) on water. - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


 Post subject: penetrating microwave (high frequency) on water.
Posted: Fri Dec 19, 2008 1:23 am 
 
Lieutenant

Joined: Thu Dec 18, 2008 10:56 pm
Posts: 4
Location: shah alam,selangor
is there any advantage or disadvantage when using microwave(high frequency) on water?


 
   
 
 Post subject:
Posted: Fri Dec 19, 2008 12:22 pm 
 
General
User avatar

Joined: Fri Feb 17, 2006 12:07 pm
Posts: 268
Location: London UK
Hi Elia
From your other post it is clear you are making (permittivity??) measurements.
A lot depends on what is mixed with the water and in what ratio. As I mention in my previous post to you, I always used closed containers like coaxial or waveguide transmission support, or resonant cavities, and a Vector Network analyzer or other impedance bridge methods. Containing the field makes the measurement easier to set up and the results more accurate and repeatable, and the errors calculable with confidence.
The open tank free space approach is obviously important if the water is flowing and not static.
What are you considering for the Free Space Method? There are 2 or 3 ways to approach it in that case. What sort of frequency range are you using?






Posted  11/12/2012
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