RU226169U1 - Two-channel electromagnetic-acoustic module - Google Patents

Abstract

The utility model relates to the field of non-destructive testing, in particular to devices for ultrasonic flaw detection, and can be used as part of robotic diagnostic complexes. The two-channel electromagnetic-acoustic module consists of two measuring channels of the same type placed in a single housing for connecting EMA transducers, each of the measuring channels contains elements connected in series with each other: a high-voltage generator, an analog-to-digital converter, an amplifier and a compensation unit, and both channels have common controller and storage sampling unit, each compensation unit includes a transformer, compensation coil, diodes, an input for connecting a generator, an input for connecting an amplifier and inputs for connecting an EMA converter, while both generators are built on high-speed bipolar transistors. The technical result of the claimed utility model is to improve the technical characteristics of the device.

Description

The utility model relates to the field of non-destructive testing, in particular to devices for ultrasonic flaw detection, and can be used as part of robotic diagnostic complexes.

An electromagnetic-acoustic device is known, containing a series-connected synchronizer, a generator power supply, a probe pulse generator made on a spark gap, an electromagnetic-acoustic converter, a receiving amplifier, an analog-to-digital converter, an arithmetic-logical unit, an indicator, a power supply for the analog circuits of the device blocks and diagnostic object, while the second, third and fourth outputs of the synchronizer are connected to the second inputs of the analog-to-digital converter, arithmetic-logical unit and indicator, the fifth output of the synchronizer is connected to the input of the power supply of analog circuits, and the input of the synchronizer is connected to the second output of the generator, and in The device contains a gap meter and a frequency setting circuit, while the input of the frequency setting circuit is connected to the output of the gap meter, and the output of the frequency setting circuit is connected to the second input of the probing pulse generator (invention patent RU 2315295, IPC G01N 29/04, 2 G01B 17/ 02, 09/14/2006, Bulletin. No. 2, 01/20/2008). The disadvantages of the known device are the low speed of its operation, associated with the use of a probing pulse generator made on a spark gap, as well as the presence of only one measuring channel, limiting the area for monitoring.

A device is known for electromagnetic acoustic (EMA) quality control of metals and alloys, containing a series-connected synchronizer, a generator of probing high-frequency (HF) pulses, including an inductor with a bias electromagnet and a pre-amplifier, the output of which is connected to the receiving path of a “wet” flaw detector or thickness gauge , while it uses a block of n generators of probing RF pulses and a multi-element inductor, each of which consists of a generator and two receiving windings located under each other, the winding of which is made of sections with the same or opposite winding direction, corresponding to the signs of the phase in /h, probing pulse, differential amplifiers connected between the corresponding receiving windings of each inductor and the input of the pre-amplifier, analog-to-digital converter (ADC), coherent signal storage, first digital-to-analog converter (DAC), unit for setting modes and selecting parameters of rf pulses , connected between the second input of the coherent signal accumulator and the synchronizer, an arithmetic-logical device connected in series with the second DAC block and connected between the third input of the coherent signal accumulator and the corresponding inputs of the pre-amplifier, and a quartz oscillator connected to the fourth input of the coherent signal accumulator (patent for utility model RU 54198, IPC G01N 29/00, 09/07/2005, Bull. No. 16, 06/10/2006). The disadvantages of the known utility model are:

the complexity of manufacturing a multi-element inductor, leading to an increase in the cost of equipment;

low speed of the device due to the use of only one EMA converter;

the large size of the dead zone, which limits the control area, due to the absence of a compensation unit in the device, which reduces the effect of the generator passing to the receiver input.

The technical result of the claimed utility model is to improve the technical characteristics of the device.

The specified technical result is achieved due to the fact that the two-channel electromagnetic-acoustic module consists of two measuring channels of the same type placed in a single housing for connecting EMA transducers, each of the measuring channels contains elements connected in series with each other: a high-voltage generator, an analog-to-digital converter, an amplifier and a compensation block, both channels having a common controller and a storage sample block, each compensation block includes a transformer, a compensation coil, diodes, an input for connecting a generator, an input for connecting an amplifier and inputs for connecting an EMA converter, both generators built on high-speed bipolar transistors.

Two parallel high-speed generators and two amplifiers, designed to operate simultaneously with two EMA converters, significantly increase the operating speed of the device, reducing the time required to carry out a complete diagnosis of the test object. Thanks to the interaction of one common controller with two EMA converters at once, the performance of the device increases at least twice compared to analogues. Compensation blocks can significantly reduce the effect of the generator passing to the amplifier input and thereby reduce the dead zone of the device, expanding the controlled area of the monitored object. Reducing the dead zone allows you to expand the area of the object available for inspection, which allows you to detect defects in places that are inaccessible to other similar devices.

The claimed utility model is illustrated schematically

in fig. 1, 2 schematically shows the compensation block using the following notation:

1, 13 - high-voltage generator;

2 - Ethernet controller;

3 - controller;

4, 9 - analog-to-digital converter (ADC);

5, 10 - amplifier;

6, 11 - compensation block;

7, 12 - EMA converter;

8 - storage sampling block;

14 - input for connecting a generator;

15, 16, 21, 22 - diode;

17 - compensation coil;

18, 23 - input for connecting an EMA converter;

19 - input for connecting an amplifier;

20 - transformer.

The two-channel electromagnetic-acoustic module consists of two identical measuring channels placed in a single housing, each of which includes, respectively, a high-voltage generator 1 and 13, an ADC 4 and 9, an amplifier 5 and 10, and compensation blocks 6 and 11 connected in series with each other. From the outside, EMA converters 7 and 12 are connected to the module using a cable, which are installed on the surface of the test object. Ethernet controller 2 is used to receive and transmit information via the Ethernet bus, which allows you to exchange data between the module and other devices, for example, a personal computer or tablet.

The two-channel electromagnetic-acoustic module operates as follows.

EMA converters 7 and 12 are located on the surface of the test object. Control signals from a computer or tablet to start measurements via the Ethernet bus enter controller 3, which controls the entire operation of the module. Controller 3 generates control signals for high-voltage generators 1 and 13. In response to these control signals, high-voltage generators 1 and 13 generate high-voltage pulses, which, through compensation blocks 6 and 11, reach EMA converters 7 and 12, respectively. High-voltage pulses with the help of EMA converters 7 and 12 form acoustic waves in the test object. If there are defects on the surface of the test object, some of these waves return to the area where the EMA transducers 7 and 12 are located and form electrical pulses in them. These pulses, passing through compensation blocks 6 and 11, enter amplifiers 5 and 10, respectively. The amplified signals are digitized using ADCs 4 and 9 and a storage sampling unit 8. The digitized data enters controller 3, where they are processed and a decision is made about the presence or absence of a defect, for example, according to the amplitude criterion, i.e. if the signal amplitude is higher than a certain predetermined threshold, then there is a defect, and if there is no such excess of the threshold, then there is no defect. The measurement result, along with information about the presence or absence of a defect, is transmitted to other devices via the Ethernet bus via Ethernet controller 2.

Each compensation block 6 and 11 has a transformer 20, a compensation coil 17, diodes 15, 16, 21 and 22, an input for connecting a generator 14, an input for connecting an amplifier 19 and inputs for connecting an EMA converter 18 and 23. Consider the operation of the compensation block 6 The signal from the high-voltage generator 1 reaches simultaneously the EMA-converter 7 and the compensation coil 17, the inductance of which is selected equal to the inductance of the EMA-converter 7. The current from the high-voltage generator 1 flows on one side through the EMA-converter 7 and back-to-back diodes 21 and 22, and on the other hand through the compensation coil 17 and back-to-back diodes 15 and 16. Thus, the differential voltage on the primary winding of the transformer 20, created by the high-voltage generator 1, turns out to be zero, and the signal from the high-voltage generator 1 does not pass to the secondary winding transformer 20 and then to amplifier 5. While the weak useful signal from the EMA converter 7, which is not interfered with by diodes 15, 16, 21 and 22, freely passes first in series to the primary and secondary windings of transformer 20 and then to the input of amplifier 5. Compensation block 11 works similarly.

Claims (1)

A two-channel electromagnetic-acoustic module, consisting of two measuring channels of the same type placed in a single housing for connecting electromagnetic acoustic transducers, each of the measuring channels contains elements connected in series with each other: a high-voltage generator, an analog-to-digital converter, an amplifier, and both channels have a common controller and a storage sampling unit, characterized in that each measuring channel contains a compensation unit, including a transformer, a compensation coil, diodes, an input for connecting a generator, an input for connecting an amplifier and inputs for connecting an EMA converter, while both generators are built on high-speed bipolar transistors.