METHOD FOR MEASURING TEMPERATURE, PRESSURE AND DENSITY SECTION IN LIQUID Russian patent published in 2019 - IPC G01B7/00 G01K7/16 G01K13/00 G01L9/04 G01N9/00 

FIELD: manufacturing technology.

SUBSTANCE: invention is intended for use in oceanology and can be used in other areas. Essence of the invention lies in the fact that distributed thermal section gauges are used, each containing n modulated by line sensitivity for the functions {<p, (z)}, of conductors. Three thermal section gauges with different temperature (α_i) and strain-gauge (β_i) sensitivity . They are put in a common soft shell and set in the medium along the measured section. Resistance of the conductors is measured and the temperature section θ{z), pressure P(z) and density ρ(z) is determined by the formulas: , , , where z is the spatial coordinate along the profile (in particular, depth); a_j;, b_j – decomposition coefficients θ(z) and P(z) by the basis of orthogonal functions {ϕ_j(z)}, , and the coefficients a_j and b_j are determined from the solution of n systems of equations of the type of α_ia_j+β_ib_j+α_iβ_ic_i=R(i, j), , where for j=0; for; R_i0 – integrated measured resistance of the 0th conductor (unmodulated) of the i-th section gauge; R_ij – integrated measured resistance of j-th conductor, modulated by the function ϕ_j(z) with amplitude r_im related to the constant component r_im; R_im – equivalent conductor resistance of the i-th profiler with constant linear resistance r_im under initial conditions; dP(z)/dz is the derivative with respect to the pressure section at the point z; g(ϕ, z) – acceleration of free fall depending on the geographical latitude of the place ϕ and the depth of the point z on the section.

EFFECT: simultaneous measurement of temperature, pressure and density sections with increased accuracy.

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