SU1670555A1 - Digitizer for eddy current controlling - Google Patents

Abstract

The invention relates to non-destructive testing and can be used to determine the quality of materials and products in mechanical engineering. The aim of the invention is to improve the accuracy of control due to the piecewise linear approximation of the transfer characteristic and increase the reliability of the control by eliminating false readings of the digital indicator. The measured parameter is converted by the eddy current transducer 3 into an electrical signal and, after processing and digitizing, is fed to the comparison unit 5. The memory blocks 11, 13, and 8 store the values of the calibrated signal, which are compared with the incoming signal, and when they mismatch, the contents of the counter 7, which is the address generator for the memory blocks 11, 13, 8, change. The results of the approximation are indicated by the digital indicator 10. 2 Cp. f-ly, 1 ill.

Description

The invention relates to non-destructive testing and can be used to determine the quality of materials and products in mechanical engineering.

The aim of the invention is to improve the accuracy of control due to the piecewise linear approximation of the transfer characteristic and increase the reliability of the control by eliminating false readings of the digital indicator.

The diagram shows a block diagram of the device.

The device comprises a generator 1 connected in series, an eddy current converter 2, an information processing unit 3, an analog-digital converter 4, a comparison unit 5, a clock pulse generator 6, a counter 7, a memory block 8, an adder 9 and a digital indicator 10.

The device also contains serially connected memory block 11, the input of which is connected to counter 7, and the output is connected to the second input of comparison unit 5, and adder 12, the second input of which is connected to analog-to-digital converter 4, and serially connected memory block 13 and a computing unit 14 connected between the output of the counter 7 and the second input of the adder 9.

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Computing unit 14 includes serially connected digital-to-analog converter 15, whose input is the input of computing unit 14, a second digital-to-analog converter 16, the second input of which is connected to adder 12, and analog-to-digital converter 17, the output of which is the output of computing unit 14.

The device works as follows.

The generator 1 feeds the eddy current transducer 2, the signals from the output of which are fed to the information comparison unit 3, at the output of which a signal appears that is proportional to the monitored parameter. The received signal is converted into a binary code by an analog-to-digital converter 4. In memory block 11, codes of values of monitored parameters are stored in nodal points, which are determined during the presetting process, and blocks 8 and 13 of memory are stored in corresponding values parameter and its increment. When the device operates, the code received from the output of the analog-digital converter 4 is compared with the code recorded in memory block 11 using the comparison block 5, and when it exceeds the specified value, the signal from the output of the comparison block 5 turns on the generator 6 clock pulses, which increases the value of the number recorded in the counter 7 and which is the address code for memory blocks 11, 13 and 8, until the initial signals are equal.

The adder 9 calculates the code difference that is fed to the input of the digital indicator 10. When the source signal exceeds the entire measuring section, the signal From the output of the comparison unit 5 keeps the digital indicator in the off state. Computing unit 14 converts the digital codes of the adder 12 and block 13-ti into a digital signal using an analog-to-digital converter 17.

Claims (3)

1. A digital device for the eddy-current control, containing a series-connected generator, an eddy-current converter, an information comparison unit and an analog-to-digital converter, and a series-connected adder and a digital indicator, characterized in that it is equipped with series-connected a comparator unit connected to the output of the analog-digital converter, a clock pulse generator, a counter and the first memory block whose output is connected to the first input an adder, connected in series by a second memory unit, whose input is connected to the counter output, and the output is connected to the second input of the comparison unit, and a second adder, the second input of which is connected to the analog-to-digital converter, and serially connected by a third memory unit, connected to the output of the counter, and the computing unit, the second input of which is connected to the output of the second adder, and the output is connected to the second input of the first adder. 2. The device according to claim 1, characterized in that, in order to increase the reliability of the control, in it the output of the comparison unit is connected to the second input of the digital indicator. 3. The device according to paragraphs. 1 and 2, characterized in that in it the Computational Unit is configured as a serially connected first digital-to-analog converter, whose input is the first input of a computing unit, a second digital-to-analog converter, whose digital input is the second input of a computing unit, and an analog-digital converter, an output which is the output of the computing unit.