METHOD FOR MEASURING LIQUID DENSITY Russian patent published in 2022 - IPC G01B7/00 G01K7/16 G01K13/00 G01L9/04 G01N9/00 

FIELD: measuring technology.

SUBSTANCE: invention relates to the field of measuring technology and is intended for use in oceanology and can be used in other fields. A modification of the hydrostatic method is proposed for measuring the local density of a liquid directly in an environment with high external pressure, for example, in the sea at a depth using an oceanological probe. It is based on distributed wired resistor temperature and pressure sensors with three elements of different strain and temperature sensitivity, containing two elements each, in a common soft shell, mounted on local sections of three rods made of a material with a low coefficient of thermal expansion and oriented down the axes of a rectangular coordinate system, secondary resistance difference transducers, analog-to-digital converters and a processor. At the same time, the sensor installation sites are arranged with a length twice the required size of the local density measurement, to represent the resistance profile in a given area, two Walsh-Hadamard functions form a spatial modulation of the two subelements of each sensor element by a longitudinal loop laying of wires on the site, the resistance difference of the wires with a secondary measuring converter is measured in analog form, converted it into digital form, by solving a system of linear algebraic equations for the three sensitive elements of each sensor, the pressure drop on the local measuring base is determined along each of the coordinate axes as projections of the vertical pressure drop on them, which is determined from the measured and calculated projections, and then the density of the liquid is determined.

EFFECT: simplification of the implementation and use of the method for measuring local density and increasing the accuracy of measurements.

1 cl, 1 dwg