The invention relates to the technical field of soil physical parameter in-situ measurement, and discloses a soil layer
natural water content portable intelligent
measuring instrument based on multi-source sensing fusion, which comprises a composite probe
assembly and an intelligent measurement and control host which are physically connected, the composite probe
assembly is configured to be inserted into a soil layer to be tested to construct a multi-
physical field test environment, and an electrical transceiving unit and an acoustic transceiving unit are integrated in the composite probe
assembly. By constructing a cross
physical field excitation and multiphase parameter collaborative decoupling mechanism, a multidimensional dynamic correlation model is established by using the thermosensitive drift characteristic of the sound velocity of a mixed medium during thermal disturbance and the transient
step response of a
dielectric constant under an
acoustic radiation force field; the problems that the
coupling influence of the
water content and the volume weight cannot be distinguished and the
conductivity of
bound water and the
conductivity of
free water are difficult to separate in a traditional means are effectively solved, and four independent physical quantities including the volumetric
water content, the in-situ dry volume weight, the
bound water content and the actual
conductivity of pore water are synchronously inverted through a
single probe. And the decoupling precision of the equipment on complex multi-phase soil medium parameters is improved.