SU1171705A1 - Device for checking physical-mechanical and electromagnetic parameters of materials - Google Patents

Abstract

DEVICE FOR MONITORING PHYSICAL AND MECHANICAL AND ELECTROMAGNETIC parameters of materials comprising serially coupled oscillator sawtooth voltage controllable oscillator and a vortex transducer podklyuchennsh to the output controlled oscillator frequency, two amplitude detectors and podklyuchennm to nx output of the comparator, characterized in that, with for the purpose of automating the measurement, it is provided with a delay line connected between the output of the converter and the input of one of the amplitude detectors in series by the active component component, the distributor, the second output of which is connected to the input of the second i amplitude detector via a delay line, and also connected to (L comparator serially connected microprocessor and power source, the output of the frequency meter, to the control input of the microprocessor. М 4j О ate fgl.1

Description

1. The invention relates to non-destructive methods for monitoring the physicomechanical and electromagnetic parameters of materials, such as electrical conductivity, map permeability, etc., and can be used in all areas of mechanical engineering. The eddy current flaw detector for measuring the physicomechanical parameters of materials containing generator, two eddy current transducers and screen transducer coils of which are connected to a compensating circuit, the outputs of this circuit are connected to the inputs of two detectors connected to the Dicator G A disadvantage of the device is a low degree of automation, as well as the use of two transducers that deteriorate the metrological characteristics due to the nonidentity of the drivers. The closest to the technical essence of the invention is a device for monitoring the physico-mechanical parameters of materials, containing a series-connected saw-tooth generator, a controlled generator, eddy-current transducers connected to the output of a controlled oscillator frequency meter, two amplitude detectors and connected to them Outputs comparator 2. A disadvantage of the known device is the low degree of automation of the control process, due to the lack of automatic processing of mathematical operations, the presence of a significant interval of indifference at high frequencies and a gentle angle of divergence of the characteristics of transducers. The purpose of the invention is to automate the measurement process. The goal is achieved by the fact that the ST.VO device for monitoring the physicomechanical and electromagnetic parameters of materials contains a series-connected voltage generator, a controlled generator and a V-type converter connected to the output of the controlled generator frequency counter, two amplitude detectors and connected to their outputs are a comparator, equipped with a delay line connected between the output of the converter and the input of one of the 7052. amplitude detectors connected in series by an active component extraction unit, a distributor, the second output of which is connected to the input of the second amplitude detector via a delay line, and also connected to the comparator output by serially connected microprocessors; and the terminal, the output of the frequency meter is connected to the control input of the microprocessor. FIG. 1 shows a block diagram of a device for monitoring the physicomechanical and electro-magnetic parameters of materials; in fig. 2 - transducer gadograph. The proposed device comprises a series-connected saw-tooth generator 1, a controlled generator 2, an eddy-current converter 3, an active component component 4, a distributor 5f first amplitude detector 6, a comparator 7, a microprocessor 8, an operator terminal 9. The second, the output of the distributor 5, is connected to the second input of the comparator 7 via successively connected delay line 10 and the second amplitude detector 11, and the second output of the controlled oscillator 2 is connected to a frequency meter 12, the output of which is connected to the control input of the microprocessor 8. On the gadograph the converter denotes the value of the desired frequency, corresponding to the maximum value of the active component of the measured parameter (f;) .. - the value of the frequencies in the interval, which is the value of the desired frequency and is characterized by Perval indifference (f ,, and fg). This interval is due to the resolution of the device blocks. The device works as follows. The generator 1 feeds the controlled generator 2 with a sawtooth voltage, thereby changing its power frequency supplied to the eddy current transducer 3. The eddy current measuring transducer. The coil 3 is installed on the product, and the signal from it is fed to the input of the active component component 4 / next to the output of the unit 4, the signal is fed to the input of the distributor 5, the amplitude detector 6 and the first input

311

the comparator 7, to the second input of which a signal arrives from the second input of the distributor 6, passing through the delay line 10 and the second amplitude detector 11. Signals for comparison are formed at the inputs of the comparator 7. Since as the frequency of the oscillator 2 changes, the value of the active component changes, then at a certain frequency value the equality

(one)

and, and

where u | - line output signal

delays;

U- - signal at the output of the distributor 5.

At the time of this equality, the signal from the output of the comparator 7 will go to one of the inputs of the microprocessor 8, thereby allowing the frequency of the output of the frequency meter 12 to be recorded in the microprocessor 8 memory registers. Then, as the frequency of the generator 2 changes, a comparison of the signals in the comparator 7 to fulfillment of conditions

(2)

and, y and

By fulfilling this condition, the comparator will change its state, which will send a signal to the microprocessor for further information processing. In this case, the value of the frequency from the output of the frequency meter 12 in the RAM of the microprocessor 8 will be recorded. The information processing in the microprocessor will be processed by the following formula

f, - and

(3)

to

After completing the processing of information using formula (3), the microprocessor will proceed to the next stage of processing

formations. If the data of microprocessor 8 contains pre-calibration data, then microprocessor 8 compares the result with 5 calibration data, then after optimizing this comparison using the formula

/ f. - f / - / fnn- fx / B,. (4)

where f, f are the two closest frequencies of the gradient graph, located in memory 15 of the microprocessor.

The value of X is displayed, if B iO or X, if B 0. If microprocessor 8 processes the information according to formula 20.

X. ± X ,,,

(five)

and

where X is the value of the parameter corresponding to the value of f on the calibration curve; X is the value of the parameter, with the corresponding value of f, on the calibration curve;

X - the value of the desired parameter corresponding to the value

. fx-

At the end of this stage of information processing, the value of the desired parameter X by the operator 9 terminal is highlighted, if the microprocessor memory 8 does not contain calibration data, but some functional dependence, then the microprocessor 8 will process it according to this functional dependence.

The device will increase the degree of automation in processing the signal of the measured parameter, eliminate the subjective factor in removing the measurement results and improve the metrological characteristics of the instrument.

Fig2

Claims (1)

DEVICE FOR CONTROL OF PHYSICAL-MECHANICAL AND ELECTROMAGNETIC PARAMETERS OF MATERIALS, containing a serially connected sawtooth voltage generator, a controlled generator and a vortex converter connected to the output of the controlled generator by a frequency meter, two amplitude detectors and a comparator connected to their outputs, which differs in In order to automate the measurement, it is equipped with a delay line connected between the output of the converter and the input of one of the amplitude detectors connected in series and block vscheleniya active component, the distributor, the second output coupled to an input of the second amplitude detector through the delay line, and also connected to a (.kodu comparator connected in series microprocessor and a terminal connected to the output of the frequency, the control input of the microprocessor. „“ SU., 1171705