RADIOPHYSICAL METHOD FOR DETECTION OF CONTENT OF PHYSICAL CLAY IN SOILS Russian patent published in 2012 - IPC G01N22/04 

FIELD: measurement equipment.

SUBSTANCE: radiophysical method for detection of physical clay in soils relates to methods of measurements based on microwaves and may be used in agriculture, land reclamation, when making an earth cadastre, etc. for detection of grain-size class of soils, in the radiophysical method for detection of physical clay content the novelty is the fact that in order to reduce time for making a measurement, the measurements are carried out at one value of soil humidity, exceeding the maximum quantity of bound water W_t, at the same time the accurate measurement of soil humidity is not required; soil samples after soaking are maintained in a tight container for 1-2 days, measurements are done on an index of refraction at the soil temperature t from 10 to 40°C at frequencies f₁=0.35 GHz and f₂=1.75 GHz, the difference of refraction indices Δn=n(f₁)-n(f₂) is found at these frequencies; the mass fraction of the physical clay C in soil is found based on the following ratio: C=(-0.0392·t+1.992)·Δn+0.0031·t-0.0594.

EFFECT: increased efficiency of measurements through time reduction.

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