Re: remote sensor to sense thin soil surface layer

[Josep M. Torrents]

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Hello,

If it helps about sensor to measure 1 mm deep water content: Microwave sensors
are probably expensive. Since it is only 1 mm deep, may be a Werner or
Schlumberger array configuration electrode about 1 mm in size could be enough.
Excitation should be AC in order to overcome polarization effects. I don't
know any company that supply above described sensor.

Best regards,

Josep M. Torrents



owner-sowacs@aqua.ccwr.ac.za wrote:

> NOTE:  To get off this list, send email to majordomo@aqua.ccwr.ac.za
> with the body of the message containing the line:
> unsubscribe sowacs
>
> Dear subscribers,
>
> I'm looking for a sensor to measure water content (or potential) at the
> upper 1 mm of the soil surface. The sensor should be non-destructive and
> should preferably measure as a stand alone unit. The sensor is meant for
> laboratory measurements (wind tunnel). I was thinking at a microwave
> sensor or something similar. Does anyone of you have some experience
> with such a sensor or knows a company that could help me? Your help
> would be truly appreciated.
>
> Best regards,
>
> Wim
>
> [Bruce comments:
> This area of sensing has not yet been covered by sowacs, so I am hoping we
> can collect and compile some good information from replies.Thanks for the
> question, Wim and please pass on any useful info you may recieve directly
> as well. Bruce]
>
> --
> ===========================================
> Wim Cornelis
> Department of Soil Management and Soil Care
> University of Ghent
> Coupure links 653
> B-9000 Gent
> Belgium
> tel.: +32 (0)9 264 60 40
> fax: +32 (0)9 264 62 47
> e-mail: wim.cornelis@rug.ac.be
> http://soilman.rug.ac.be
> ===========================================