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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 Wim, There is a method, used in industrial process, based on the absorption properties of O-H bonds in the near infrared wavelengths. this is a kind of infrared spectro-photometer, used in all kinfd of processes (food industry, tobacco, forestry products, chemichal industry,minerals, waste....). It is usually located above transport bands, and enables you to measure humidity in the surface lyaer of the product. It is of course non destructive, but it's a bit expensive. I know a manufacturer of such systems: It's called MSC Moisture Systems. Check their website: www.moisturesystems.com and for Europe: www.rutter.nl I can't promise that is could meet exactly your requirements, but it's worth asking them. Maybe you could also contact the scientists from Wajeningen agricultural university (NL). As far as I remember, they were working on a radar system several years ago. I hope it will help. Kind regards, RaphaÎl Peno-Mazzarino Agronomist engineer, Agronomy and Environment dept. SDEC France scientific equipments for Agronomy, Environment and Nuclear Z.I. de la are 37310 Reignac sur Indre FRANCE tel: +33 2 47 94 10 00 fax: +33 2 47 94 17 13 website: www.sdec-france.com e-mail: info@sdec-france.com owner-sowacs@aqua.ccwr.ac.za a *crit : > 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 > ===========================================