MICROWAVE HEATING OF SOIL

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Authors
  1. Seregelyi, J.S.
  2. Apps, R.
  3. Boyle, M.
  4. Gardner, C.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
There are numerous applications for soil heating. For example; thawing soil prior to excavation, chemical decontamination, land mine clearance and soil sterilization are just a few potential uses. This report specifically investigates the use of microwave heating of soil. A discussion of the dielectric properties of soils has been presented. The various RF loss mechanisms have been reviewed and an empirical model has been adopted to formulate numerical expressions for the skin depth, heating rates, power deposition etc. In an effort to validate the numerical formulation presented and to quantify microwave soil heating rates, an experimental program was established. Real-time measurements of heating rates were performed for various moisture contents. It was shown that sand temperatures could be raised to well above 150C in a few min. using a waveguide applicator. It was also shown that microwave radiation can easily penetrate several centimetres into the soil at the 2.45 GHz frequency used for the experiments.
Report Number
DREO-1331 —
Date of publication
01 Feb 1998
Number of Pages
46
DSTKIM No
98-02217
CANDIS No
509061
Format(s):
Hardcopy;Document Image stored on Optical Disk

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