RU99106877A - METHOD FOR MEASURING PHYSICAL VALUES AND A DEVICE FOR ITS IMPLEMENTATION - Google Patents

Claims (1)

1. A method of measuring physical quantities converted into an electric capacitance, inductance or resistivity, which consists in the fact that the test sample and the standard are connected to an AC or DC source, characterized in that the measured physical quantity is judged by the angle of shift of the magnetic field induction vector, induced by the vector sum of the three currents having a common origin lying in one plane and deployed at angles of 120 ^o, two (one) of which occur in the test samples (test sample), and one (two) flows through a standard (two standard) relative to the induction vector of the magnetic field induced by the current vector in the reference (the test sample) chain.  2. The method according to claim 1, characterized in that the shift angle of the magnetic field induction vector induced by the vector sum of three currents relative to the magnetic field induction vector induced by the current vector in the standard circuit (test sample) is judged by the ratio of two voltages proportional to the cosine and sine projections of the vector sum of three currents onto the current vector through the standard (test sample). 3. The device for implementing the method according to claim 1, characterized in that the test sample is a sensitive element of the primary transducer of a physical quantity, consists of two parts connected, like the standard, with the windings of the transducer of the vector sum of three currents into the magnetic field induction vector containing a round packet plates made of a material such as electrical steel, assembled into a magnetically soft core isotropic in angle, on which three plane-parallel windings with winding planes parallel to the central axis of the core are wound of the plate, with equal numbers of turns and resistances, and their winding directions are rotated between themselves at an angle of 120 ^o , coupled by a magnetic field with an anisotropic angular ferromagnetic body on the axis of rotation, perpendicular to the plane of the scale, calibrated taking into account the values of the standard and the trigonometric function of the shift angle of the vector sum three currents relative to the current vector through the standard,
4. The method according to claim 1, characterized in that an additional standard and currents from two standards are introduced, and the current of the test sample — the primary transducer of the physical quantity is fed to the windings of the vector sum converter of three currents into the magnetic field induction vector, and the value of the measured physical quantity is calculated by formulas (1) - (3) of connection with the values of standards such as electric capacitance, inductance or conductivity and the trigonometric function of the shift angle of the vector sum of three currents relative to the current vector in the primary conversion circuit ovatelya counted by the rotation transducer coupled to the magnetic field of an anisotropic ferromagnetic body angularly on the rotation axis perpendicular to the plane of the lamination:

in the range: 0 <α _x ≅ 60 ^° ;

in the range: 60 ^° ≅ α _x ≅ 120 ^° ;
R _x = 0.5 (R ₁ + R ₂ ) - (R ₂ -R ₁ ) • ctgα _x (3)
in the range: 120 ^° ≅ α _x ≅ 180 ^° ,
smoothly passing one into another at the borders of ranges at angles: α _x = 60 ^° ; α _x = 120 ^° , and subject to the conditions: R ₁ <R ₂ ; α _x = 0, when the chains with R ₁ and R ₂ are open, or read from a scale parallel to the plane of the core plates, calibrated taking into account the above standards and the trigonometric function of the angle, when observing the position of the ferromagnetic body. 5. The device for implementing the method according to claim 2, characterized in that the primary transducer and the reference (s) are connected to the windings of the vector sum converter of three currents into two voltages containing a package of round plates made of a material such as electrical steel, assembled into a magnetically soft core isotropic in angle , on which are wound five plane-parallel windings with coil planes parallel to the central axis of the core, three of which having equal numbers of turns and resistivity, and their directions to us the sweeps are rotated between themselves at angles of 120 ^o , currents flow from the primary transducer and the reference (s), inducing a magnetic field in the core, and on the other two windings having equal numbers of turns and resistance, and their winding directions are rotated between themselves at an angle 90 ^o , the magnetic field of the core induces two voltages associated with the measured physical quantity and the standard (s), while the winding on which the voltage is proportional to the cosine projection of the vector sum of three currents on the current in the standard circuit (ne primary transducer), coincides in the direction of winding with the winding along which current flows from the standard (primary transducer). 6. The device according to claim 5, characterized in that the converter of two voltages into the magnetic field induction vector is introduced, comprising a package of round plates made of a material such as electrical steel, assembled into a magnetically soft core isotropic in angle, on which two plane-parallel windings with planes are wound turns parallel to the central axis of the core, together with equal numbers of turns and the resistance, and the winding direction of the deployed between an angle of 90 ^o, assembled with the angle anisotropic ferromagnetic body on the axis of rotation perpendicular to the plane of the scale, calibrated taking into account the values of the standard (s) and the trigonometric function of the angle of shift of the vector sum of three currents relative to the current vector through the standard (primary transducer), and a magnetically controlled element is installed to give a signal about the physical value reaching a certain specified value, for example, a reed switch, in the zone of exit of a magnetic field from the housing of the converter of two voltages into the magnetic field inductance vector.  7. The device according to PP.5 and 6, characterized in that the vector sum of the three currents into two voltages is made of magnetic fields connected through the walls of the housings and the magnetically soft ring core of the three currents to the magnetic field induction vector and the two voltage converter to the magnetic induction vector field enabled to work in the opposite direction.