RU1786415C - Device for nondestructive testing of laminated plastics - Google Patents

Abstract

Usage: non-destructive testing of the dielectric and technological properties of laminated plastics, in particular carbon plastics. SUMMARY OF THE INVENTION; the meter contains a branched magnetic circuit consisting of forward and reverse magnetic circuits with perpendicular bridges. Spiral sections are located on the elements of the magnetic circuit. The measuring windings are connected to measuring the ratio of input and output electric and magnetic voltages and measuring phase difference. With the introduction of a controlled part, both the material and the imaginary components of the chain transfer measure change. 2 ill. with

Description

The invention relates to the field of measurement technology and is intended to control the conductive dielectric and technological properties of laminated plastics, in particular carbon plastics.

Known devices for non-contact measurement of material properties, comprising a magnetic circuit with electric windings, recording equipment.

A device is known for measuring the electrical conductivity of carbon fiber reinforced plastic containing a magnetic circuit with electrical windings. The magnetic core is made in the form of a ferrite core with a half-toroidal shape included in the feedback circuit of the LC generator. The electrical conductivity is determined by the eddy current method. Change integrated

the resistance of the eddy current transducer causes a corresponding change in the frequency of the oscillator, which is recorded by the recording equipment.

In known devices, sufficient sensitivity and accuracy of control are not provided.

This goal is achieved by the fact that the proposed device is equipped with a current-collecting resistor with a potentiometer, the rectangular magnetic circuit is made with n transverse sections parallel to its lateral sides and equipped with (6p + 5) additional spiral sections, while the transverse sections and adjacent sections of the rectangular the magnetic core, as well as one of its sides, are made with a gap, the ends of

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the filaments forming the gap are bifurcated and connected to the ends of the corresponding spiral sections, the turns of which are made with a gap in the plane of the rectangular magnetic circuit, the compensation elements are made in the form of parallel connected variable resistor, variable capacitor and variometer, and the measurement unit is made in the form of two dividers, the outputs of which are connected to the inputs of the multiplier, and two phase meters, the outputs of which are connected to the inputs of the adder, and the collector resistor is connected in series with a coil of excitation located on the second side of the rectangular magnetic circuit, sections of the compensation winding are located on the transverse sections of the rectangular magnetic circuit, the first and second sections of the measuring winding are located at the ends of one of the bases of the rectangular magnetic circuit and are connected to pairwise connected inputs of the first divider and the first phase meter, and the pairwise combined inputs of the second divider and the second phase meter are connected respectively to the terminals of the collector resistor and potentiometer, end which are located at the ends of the first side of the rectangular magnetic circuit.

Figure 1 presents the magnetoelectric chain Converter properties of composite materials; Fig. 2 is the same, view A.

The converter contains direct 1 and return 2 magnetic circuits with perpendicular jumpers 3. Each arm of the magnetic circuit contains a node 4 of two parallel sections, connected in accordance with and made of half rings 5, located along a helical line with a slot 6. Magnetic circuits are mounted on an insulating frame 7 on which the test piece 8 is located. On the output part of the magnetic circuitry there is a first output measuring winding 9 connected to a magnetic flux divider 10 and to a phase meter for magnetic fluxes 11, a second measuring winding 13 is mounted on the flexible insulating cylinder 12, connected to the magnetic output of the circuit and connected to a magnetic divider 14 and a phase meter for magnetic voltages 15; at the input of the magnetic circuitry there is a first input measuring winding 16 connected to the magnetic flux divider 10 to the magnetic flux phasemeter 11, with an active resistance 17 connected in series with the field winding 18, the voltage is applied to the input of the magnetic divider 14 and magnetic phase meter 15. Compensation winding 19 is connected to parallel-connected adjustable resistance 20, inductance 21 and capacitance 22, Signals from the magnetic flux divider 10 and the divider m gnitnyh voltages 14 are supplied to the multiplier 23, and signals from the phase meter 10 and the magnetic flux of the magnetic phasemeter voltages 15 are supplied to the adder 24.

The magnetic chain converter is a cascade connection of magnetic four-terminal if there is a characteristic matching (the drawing shows a special case of L-shaped magnetic four-terminal), the processes in the magnetic four-terminal and in the magnetic chain are similar, respectively, to the processes in the electric four-terminal and electric chain scheme.

For a homogeneous circuit design, the transfer measure g is n times larger than the transfer measure for one quadrupole

f-j UMKI

g ngi nln j, uMK- +) +

+ nj (-Vojz)

where n is the number of cascadely connected four-terminal networks;

UMKI, UMK2 and Phi Fg input and output voltages and flows of k-ro magnetic four-port network;

 . and V-oa are the initial phases of these stresses and flows. The cascade connection of the four-terminal network provides an increase in the sensitivity of the system by a factor of n, therefore the accuracy of its measurements also increases. When placing the measured part, as shown in the figure, both the material and imaginary components of the transmission measures change, that is, both 1) Outputs 1 and F1, as well as output 2 change. The output signals, as a result of their combination, turn into a common output signal functionally associated with primary conductive or process parameters.

Under real production conditions, the properties of the part under each magnetic unit and the intensity of the circular eddy currents under them can be different, which leads to a difference in the individual parameters of the four-terminal network. Variation in parallel is provided for matching the magnetic circuitry.

included resistance, inductance, and capacitance of the compensation windings for maximum sensitivity. The use of a magnetoelectric chain converter makes it possible to increase the sensitivity and accuracy of control, significantly reduce the time of control, and allows surgical intervention in process correction. In addition, the proposed non-destructive testing device has, in contrast to the existing one, low costs, energy intensity and material consumption.

Claims (1)

SUMMARY OF THE INVENTION A device for non-destructive testing of the properties of laminated plastics, comprising a rectangular magnetic circuit with a helical section and with an excitation winding and partitioned measuring and compensation windings, compensation elements connected in parallel to the respective sections of the compensation winding, and a measuring unit, characterized in that , in order to increase the sensitivity, it is equipped with a current-collecting resistor, a potentiometer, a rectangular magnetic circuit is made with n transverse sections, pa allelic its lateral sides and is provided with (6n + 5) additional helical portions, wherein the transverse portions, and related portions of rectangular magnitopro0 5 0 5 0 water, as well as one of its sides, is made with a gap, the ends of the sections of the magnetic circuit forming the gap are bifurcated and connected to the ends of the corresponding spiral sections of the rectangular magnetic circuit, the turns of which are made with a gap in the plane of the rectangular magnetic circuit, the compensation elements are made in the form of a parallel-connected variable resistor, variable capacitor and variometer, and the measurement unit is made in the form of two dividers, the outputs of which are connected to the inputs of the multiplier, and two phases trov, the outputs of which are connected to the inputs of the adder, and the collector resistor is connected in series with the field winding located on the second side of the rectangular magnetic circuit, sections of the compensation winding are located on the transverse sections of the rectangular magnetic circuit, the first and second sections of the measuring winding are located at the ends of one of the bases rectangular magnetic circuit and connected in pairs to the combined inputs of the first divider and the first phase meter, and pairwise combined inputs of the second Ithel phasemeter and second terminals connected respectively to the collector and resistor tsialmetra potentials, the ends of which are located at the ends of the first side of the rectangular magnetic circuit. 20 21 22 Ј L C