SU1239633A1 - Device for measuring specific conductance - Google Patents

Abstract

The invention can be used in various fields of technology to control the quality of products from non-magnetic electrically conductive materials by their specific electrical conductivity. The purpose of the invention is to improve the measurement accuracy. The device contains an auto-oscillator I, a vortex converter 2, phase detectors 3, 8 and 9, a phase shifter 7, a voltage divider 4, multipliers 5 and 10, and an indicator 6. The signal conversion function in the device has the form ff kCo (. (Cosof uoso g) where ff is the specific electrical conductivity; o, c (d are the phase angles of the applied voltage in the measuring windings of the vortex converter; k-const. Introduction to the device of phase detectors 8 and 9, multipliers 5 and 10, voltage divider 4 and the second measuring winding vortex converter located minutes at a fixed distance relative to the first, .sposobstvuet achieve this goal. 1 yl. Q (L tc with with with with with

Description

The invention relates to the field of instrumentation technology and can be used in aviation, machine-building industry to control the quality of products from non-magnetic electrically conductive materials by the specific electrical conductivity.

The goal is to increase the measurement accuracy by reducing the error due to gap variations.

The drawing shows a block diagram of the proposed device for measuring the specific electrical conductivity.

The device contains a series-connected auto-oscillator 1, a vortex-current transducer fBTIlj 2, a phase detector 3, a voltage divider 4, a multiplier 5 with combined inputs and an indicator 6, a phase shifter 7 whose input is connected to the output of the autogenerator 1, a phase detector 8, inputs which are connected to the output of the first measuring winding of the VTP 2 and to the output of the phase rotator 7, phase detector 9, the inputs of which are connected to the output of the second measuring winding of the VTP 2 and to the output of the phase rotator 7, the multiplier .10, whose inputs are connected us to the outputs of the phase detectors 8 .i 9, .a output - to the second input of the divider 4 stresses.

The device works as follows.

The auto-oscillator 1 feeds the sinusoidal current of the VTP 2. The output signals of our VTP 2 from the measuring windings located relative to each other at a certain fixed distance U K are simultaneously fed to the inputs of the phase detectors 3.8 and 9. The output signal of the phase detector 3 is proportional to the angle of the phase difference signals of the first and second measuring windings. The output voltage of the phase shifter 7 is in phase with the excitation current of the VTP 2 and. is fed to the reference inputs of phase detectors 8 and 9, resulting in the output signals of the latter are proportional to the values (n sozo (r. These signals go to the inputs of multipliers 10. The output signal of the multiplier 10 is proportional to coso values (u cosa (, 2, arrives

VNIIPY Order 3391

Random polygons pr-tie,

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0

five

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fi

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to the input of the divider 4 voltage, the output signal of which is proportional to the private from dividing the output signal of the phase detector 3 to the output signal of the multiplier 10. In multiplier 5, the signal from the output of the voltage divider 4 is squared and supplied to the indicator 6. .

Thus, the function transforms. signals in the proposed device for measuring the electrical conductivity is

i2

b, to:

oC J - s,

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to

Form

,

eosoe cos ot

where o is the specific electrical conductivity;

o (/, o (2-phase angles of the applied voltage to the first and second measuring windings, respectively; const. ula of the invention

A device for measuring the specific electrical conductivity, containing a series-connected auto-generator, a Viourotock transducer with excitation and measuring windings, as well as a first phase detector, a phase shifter whose input is connected to the output of the auto-generator, as well as an indicator that has the aim is to increase the measurement accuracy by reducing the error due to variations in the gap, it is equipped with second and third phase detectors, two multipliers and a voltage divider, the second and The measuring winding of the eddy current transducer located at a fixed distance relative to the first one, the inputs of the first phase detector are connected to the outputs of the measuring windings of the eddy current transducer, and the output to the input of a dividing voltage cell, the output of which is connected to the indicator input, the second and third phase detectors are connected to the output of the phase-shifters and to the outputs of the second and first measuring windings, respectively; the outputs of the second and third phase detectors are connected enes to the inputs of the second multiplier, whose output is connected to the second input of the voltage divider.

Circulation 728 Subscription

Uzhgorod, st. Project, 4

Claims (1)

SUMMARY OF THE INVENTION A device for measuring electrical conductivity, comprising a series-connected oscillator, eddy current transducer exciting and measuring windings, as well as the first 20 phase detector, phase shifter, the input of which is connected to the output of the oscillator, as well as an indicator, which, in order to improve the accuracy of measurements by reducing the error due to variations in the gap, it is equipped with a second and the third phase detectors, two multipliers and a voltage divider, the second measuring winding of the eddy current transducer located at a fixed distance relative to the first, the inputs of the first phase detector under lyucheny to the outputs of the measuring coil eddy current transducer and an output - to an input voltage divider, which output through a first multiplier connected to the input current in phase 2 and EPR excitation. fed to the reference inputs of the phase l 50 of detectors 8 and 9, as a result of which the output signals of the latter are proportional to the values of soi ^ and cosoG. These signals are fed to the inputs of the multipliers 10. The output signal HS multiplier 10, proportional to cos ^ h cos <G, VNIIIPI Order 3391/45 Custom polygr. production, indicators, inputs of the second and third phase detectors are connected to the output of the phase shifter and to the outputs of the second and first measuring windings respectively, the outputs of the second and third phase detectors are connected to the inputs of the second multiplier, the output of which is connected to the second input of the voltage divider. Circulation 728 ____ Subscription Uzhhorod, 'st. Project, 4