METHOD OF FLUID MEDIUM DENSITY MEASUREMENT AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2008 - IPC G01N9/10 

FIELD: physics.

SUBSTANCE: invention can be applied in measuring density, including local density, of fluid media. The method involves complete submersion of a physical body with given mass and volume into the measured medium. Before the submersion the vacuum-corresponding coordinates of centre of gravity (CG) and centre of buoyancy (CB) of the physical body suspended at the rotation axis are defined. The physical body is swiveling around the suspension axis at an angle proportionate to the fluid density, and a magnet with its magnetic field vector is turning together with the axis at the same angle and affects Hall-effect sensor, thus causing a voltage proportionate to the swivel angle of the physical body to appear at the sensor output. An analog-to-digital converter transforms the voltage into a code processed by a microprocessor. After submersion coordinates of CM and CB shift against the suspension point due to the medium are defined. The microprocessor calculates adjustments for physical body dimensions change due to temperature, and the value of density. CM and CB of the submerged physical body should not lie at one direct line with the suspension point.

EFFECT: possibility to measure density through the whole height of gas or fluid in a reservoir.

2 cl, 5 dwg