A multi-channel eddy current instrument calibration device and calibration method

Abstract

The present invention discloses a multi-channel eddy current instrument calibration device, which includes an eddy current instrument, an oscilloscope connected to the eddy current instrument, a calibration computer, and a function signal generator. The oscilloscope has a channel input terminal and an oscilloscope ground terminal. The eddy current instrument includes an eddy current instrument ground terminal, a plurality of eddy current signal generators and a plurality of eddy current signal receivers. Among the plurality of eddy current signal receivers, a part are positive input terminals and the others are negative input terminals. The function signal generator has an output terminal and a function ground terminal. It further includes a generating calibration adapter for connecting each generator to the channel input terminal of the oscilloscope one by one, and a receiving calibration adapter for connecting each positive input terminal to the output terminal of the function signal generator one by one. The present invention uses the generating calibration adapter and the receiving calibration adapter to achieve rapid conduction of each port, thereby improving the calibration speed.

Description

Technical Field

[0001] The present invention belongs to the field of nuclear power detection equipment, and particularly relates to a multi-channel eddy current instrument calibration equipment and a calibration method. Background Art

[0002] Eddy current testing is a conventional non-destructive testing method based on the principle of electromagnetic induction. An eddy current instrument is a device for detecting surface and near-surface defects of conductive materials based on the eddy current testing principle. An eddy current instrument usually consists of a signal generation unit (hereinafter referred to as the generator) and a signal reception and processing unit (hereinafter referred to as the receiver), etc. A multi-channel eddy current instrument contains multiple parallel receivers, that is, multiple physical channels.

[0003] The eddy current instrument needs to be calibrated regularly to ensure that the instrument meets the usage requirements.

[0004] The output of the eddy current instrument generator is usually a periodic sine signal. The calibration of the eddy current instrument generator mainly includes the frequency accuracy and amplitude accuracy of the generator. When calibrating the eddy current instrument generator, connect the output end of the eddy current instrument generator to the input end of the oscilloscope, set different amplitudes and frequencies of the eddy current instrument output, and record the measurement results of the oscilloscope.

[0005] The calibration of the eddy current instrument receiver is usually based on the principle of differential frequency method. When calibrating the eddy current instrument receiver, connect the input end of the eddy current instrument receiver to the output end of the function signal generator, and set the function signal generator to output a sine signal, whose frequency is slightly different from the frequency of the eddy current instrument. At this time, the signal output by the eddy current instrument to the host computer software is a circle whose radius is proportional to the amplitude of the signal output by the function signal generator, that is, a signal with a basically fixed amplitude and a periodically changing phase. By sampling or calculating the amplitude of this signal at a certain time interval, and completing relevant records and calculations, the calibration of the eddy current instrument receiver can be completed.

[0006] The main disadvantage of the above solution is that a large amount of data needs to be manually recorded and calculated, the operation is cumbersome, and the efficiency is low. Summary of the Invention

[0007] The object of the present invention is to provide a multi-channel eddy current instrument calibration equipment with high efficiency and simple operation.

[0008] To solve the above technical problems, the present invention adopts the following technical solutions: A multi-channel eddy current instrument calibration device, which includes an eddy current instrument, an oscilloscope connected to the eddy current instrument, a calibration computer, and a function signal generator. The oscilloscope has a channel input terminal and an oscilloscope ground terminal. The eddy current instrument includes an eddy current instrument ground terminal, a plurality of eddy current signal generators, and a plurality of eddy current signal receivers. Among the plurality of eddy current signal receivers, some are positive input terminals, and the others are negative input terminals. The function signal generator has an output terminal and a function ground terminal. It further includes a generating calibration adapter for connecting each generator to the channel input terminal of the oscilloscope one by one, and a receiving calibration adapter for connecting each positive input terminal to the output terminal of the function signal generator one by one. The generating calibration adapter has a plurality of first relays respectively corresponding to and connected to the channel input terminal of the oscilloscope for each of the generators, and a first signal line for connecting the oscilloscope ground terminal and the eddy current instrument ground terminal; The receiving calibration adapter has a plurality of second relays respectively corresponding to and connected to the output terminal of the function signal generator for each of the positive input terminals, and a second signal line for connecting the function ground terminal and the eddy current instrument ground terminal.

[0009] Preferably, the generating calibration adapter includes a first resistor connected between the connection point of the first relay and the channel input terminal of the oscilloscope and the first signal line.

[0010] Preferably, the receiving calibration adapter includes a second resistor connected between the connection point of the second relay and the output terminal of the function signal generator and the second signal line.

[0011] The present invention also provides a calibration method based on the above multi-channel eddy current instrument calibration device, which includes the following steps:

[0012] A. Calibration of the generator;

[0013] B. Calibration of the receiver;

[0014] Among them, A. The calibration of the generator includes the following steps:

[0015] A1. Connect the eddy current instrument, oscilloscope, calibration computer, and generating calibration adapter;

[0016] A2. The calibration computer is signal-connected to the eddy current instrument and the oscilloscope;

[0017] A3. Check the preset eddy current instrument configuration, oscilloscope configuration, and calibration plan configuration;

[0018] A4. Initialize the eddy current instrument and the oscilloscope according to the preset configuration;

[0019] A5. Control the generating calibration adapter to make one of the generators conduct;

[0020] A6. Configure and modify the frequency and amplitude of the generator output according to the calibration plan;

[0021] A7. Adjust the horizontal and vertical scaling of the oscilloscope according to the frequency and amplitude of the generator;

[0022] A8. The calibration computer reads the frequency and amplitude measured by the oscilloscope;

[0023] A9. Repeat steps A6 - A8 until the calibration of all frequencies and amplitudes is completed.

[0024] A10. Repeat steps A5 - A9 to complete the calibration of the remaining generators one by one.

[0025] Among them, the calibration of the receiver includes the following steps:

[0026] B1. Connect the eddy current instrument, function signal generator, calibration computer and receiving calibration adapter;

[0027] B2. Connect the calibration computer to the eddy current instrument and the function signal generator for signal connection;

[0028] B3. Check the preset eddy current instrument configuration, function signal generator configuration and calibration plan configuration;

[0029] B4. Initialize the eddy current instrument and the function signal generator according to the preset configuration;

[0030] B5. Control the special adapter for receiver calibration to make only one positive input terminal conduct;

[0031] B6. Configure and modify the frequency and sampling rate of the eddy current instrument according to the calibration plan;

[0032] B7. Configure and modify the amplitude and frequency of the function signal generator according to the calibration plan, making its frequency slightly different from that of the eddy current instrument;

[0033] B8. Record the eddy current data for a period of time and calculate the calibration result according to the current calibration item;

[0034] B9. Repeat steps B6 - B8 to complete the calibration of all frequencies;

[0035] B10. Repeat steps B5 - B9 to complete the calibration of all receivers.

[0036] Optimized, the calibration computer is connected to the function signal generator via Ethernet or USB or GPIB.

[0037] Optimized, the calibration computer is connected to the oscilloscope via Ethernet or USB or GPIB.

[0038] Optimized, the eddy current instrument and the calibration computer are connected via Ethernet.

[0039] The beneficial effects of the present invention are as follows: By using the generating verification adapter and the receiving verification adapter, the present invention realizes the rapid conduction of each port, improving the verification speed. Description of the Drawings

[0040] Figure 1 Connection method for generator verification;

[0041] Figure 2 Generating verification adapter;

[0042] Figure 3 Connection method for receiver verification;

[0043] Figure 4 Special adapter for receiver verification of four-channel eddy current instrument. Detailed Embodiment

[0044] The following provides a detailed description of the present invention in conjunction with the embodiments shown in the drawings:

[0045] As Figure 1 and 3 shown, the multi-channel eddy current instrument verification device includes an eddy current instrument, an oscilloscope connected to the eddy current instrument, a verification computer, and a function signal generator. The oscilloscope has a channel input terminal and an oscilloscope ground terminal. The eddy current instrument includes an eddy current instrument ground terminal, a plurality of eddy current signal generators, and a plurality of eddy current signal receivers. Some of the plurality of eddy current signal receivers are positive input terminals, and the others are negative input terminals. The function signal generator has an output terminal and a function ground terminal. It further includes a generating verification adapter (SW1 and SW2) for connecting each generator to the channel input terminal of the oscilloscope one by one, and a receiving verification adapter (SW3, SW4, SW5, and SW6) for connecting each positive input terminal to the output terminal of the function signal generator one by one. The generating verification adapter has a plurality of first relays respectively corresponding to and connected to the channel input terminals of the oscilloscope, and a first signal line L1 for connecting the oscilloscope ground terminal and the eddy current instrument ground terminal; The receiving verification adapter has a plurality of second relays respectively corresponding to and connected to the output terminals of the function signal generator, and a second signal line L2 for connecting the function ground terminal and the eddy current instrument ground terminal. The generating verification adapter includes a first resistor R1 connected between the connection point of the first relay and the channel input terminal of the oscilloscope and the first signal line L1. The receiving verification adapter includes a second resistor R2 connected between the connection point of the second relay and the output terminal of the function signal generator and the second signal line L2.

[0046] The connection method during the generator calibration is as follows: When the generator is automatically calibrated, an oscilloscope, a calibration computer, a generator calibration adapter, and the eddy current instrument to be calibrated are required; the calibration computer and the eddy current instrument are usually connected and communicate via Ethernet; the calibration computer and the oscilloscope can be connected and communicate through interfaces such as Ethernet, USB, or GPIB; the eddy current instrument and the oscilloscope communicate through a dedicated oscilloscope for generator calibration. The generator calibration adapter can connect the generator output end of the eddy current instrument to the channel input end of the oscilloscope, for example, channel 1 (CH 1) of the oscilloscope; connect the ground end GND of the eddy current instrument to the ground end GND of the oscilloscope. The multi-channel eddy current instrument has multiple generators (GEN 1, GEN2, etc.), and the calibration of each generator is realized by controlling the on and off of multiple first relays (SW1, SW2, etc.). The control of the relay is achieved through the digital output built in the eddy current instrument or by adding an additional digital output module in the adapter.

[0047] The generator calibration method includes:

[0048] A1 Connect the eddy current instrument, oscilloscope, calibration computer, and generator calibration adapter;

[0049] A2 The calibration computer establishes a software connection with the eddy current instrument and the oscilloscope;

[0050] A3 Check the preset configurations of the eddy current instrument, oscilloscope, and calibration plan;

[0051] A4 Initialize the eddy current instrument and the oscilloscope according to the preset configurations;

[0052] A5 Control the generator calibration adapter to make only GEN 1 conduct;

[0053] A6 Modify the frequency and amplitude of the generator output according to the calibration plan configuration;

[0054] A7 Adjust the horizontal and vertical scaling of the oscilloscope according to the frequency and amplitude of the generator;

[0055] A8 The calibration computer reads the frequency and amplitude measured by the oscilloscope;

[0056] A9 Repeat steps A6 - A8 until the calibration of all frequencies and amplitudes is completed.

[0057] A10 Control the generator calibration adapter to make only GEN 2 conduct;

[0058] A11 Repeat steps A6 - A9 to complete the calibration of GEN 2.

[0059] The connection method during the receiver calibration is as follows:

[0060] When automatically calibrating the receiver, a function signal generator, a calibration computer, a dedicated adapter for receiver calibration, and the eddy current instrument to be calibrated are required. The calibration computer and the eddy current instrument are usually connected and communicate via Ethernet; the calibration computer and the function signal generator can be connected and communicate via interfaces such as Ethernet, USB, or GPIB; the eddy current instrument and the function signal generator communicate via a dedicated oscilloscope for receiver calibration. The dedicated adapter for receiver calibration can connect the output terminal of the function signal generator to the positive input terminals (INPUT 1+, INPUT 2+, INPUT 3+, INPUT 4+, etc.) of the receiver of the eddy current instrument; connect the GND terminal of the function signal generator to the GND terminal of the eddy current instrument and the negative input terminals (INPUT 1-, INPUT 2-, INPUT 3-, INPUT 4-, etc.) of the receiver. The multi-channel eddy current instrument has multiple receivers built-in. According to different calibration requirements, multiple receivers can be simultaneously turned on or turned on one by one by controlling the on and off of multiple relays (SW3, SW4, SW5, SW6, etc.). The control of the relay is achieved through the digital output built into the eddy current instrument or by adding an additional digital output module in the adapter.

[0061] The receiver calibration method includes:

[0062] B1 Connect the eddy current instrument, function signal generator, calibration computer, and dedicated adapter for receiver calibration;

[0063] B2 Establish a software connection between the calibration computer and the eddy current instrument and the function signal generator;

[0064] B3 Check the preset configurations of the eddy current instrument, function signal generator, and calibration plan;

[0065] B4 Initialize the eddy current instrument and the function signal generator according to the preset configurations;

[0066] B5 Control the dedicated adapter for receiver calibration to make only INPUT 1 conduct;

[0067] B6 Modify the frequency and sampling rate of the eddy current instrument according to the calibration plan configuration;

[0068] B7 Modify the amplitude and frequency of the function signal generator according to the calibration plan configuration so that its frequency is slightly different from the frequency of the eddy current instrument;

[0069] B8 Record the eddy current data for a period of time and calculate the calibration result according to the current calibration item;

[0070] B9 Repeat steps B6 - B8 to complete the calibration for all frequencies;

[0071] B10 Turn on the other receivers in sequence and repeat steps B6 - B9 to complete the calibration for all receivers.

[0072] The above embodiments are only used to illustrate the technical concept and features of the present invention. The purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and it is not intended to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A multi-channel eddy current instrument calibration device, which comprises an eddy current instrument, an oscilloscope connected to the eddy current instrument, a calibration computer, and a function signal generator. The oscilloscope has a channel input terminal and an oscilloscope ground terminal. The eddy current instrument includes an eddy current instrument ground terminal, a plurality of eddy current signal generators, and a plurality of eddy current signal receivers. Some of the plurality of eddy current signal receivers are positive input terminals, and the others are negative input terminals. The function signal generator has an output terminal and a function ground terminal, and is characterized in that: It also includes a generating verification adapter for connecting each generator to the channel input terminal of the oscilloscope one by one, and a receiving verification adapter for connecting each positive input terminal to the output terminal of the function signal generator. The generating verification adapter has a plurality of first relays respectively corresponding to and connected to the channel input terminals of the oscilloscope, and a first signal line for connecting the ground terminal of the oscilloscope and the ground terminal of the eddy current instrument; The receiving verification adapter has a plurality of second relays respectively corresponding to and connected to the output terminals of the function signal generator, and a second signal line for connecting the ground terminal of the function signal generator and the ground terminal of the eddy current instrument; When automatically verifying the generator, an oscilloscope, a verification computer, a generating verification adapter, and the eddy current instrument to be verified are required; The verification computer and the eddy current instrument are usually connected and communicate through Ethernet; The verification computer and the oscilloscope can be connected and communicate through Ethernet, USB, or GPIB interface; The eddy current instrument and the oscilloscope communicate through a dedicated oscilloscope for generator verification; The generating verification adapter can connect the generator output terminal of the eddy current instrument to the channel input terminal of the oscilloscope; Connect the ground terminal GND of the eddy current instrument to the ground terminal GND of the oscilloscope; The multi-channel eddy current instrument has multiple built-in generators, and the verification of each generator is realized by controlling the on and off of multiple first relays; When automatically verifying the receiver, a function signal generator, a verification computer, a dedicated adapter for receiver verification, and the eddy current instrument to be verified are required; The verification computer and the eddy current instrument are usually connected and communicate through Ethernet; The verification computer and the function signal generator can be connected and communicate through Ethernet, USB, or GPIB interface; The eddy current instrument and the function signal generator communicate through a dedicated oscilloscope for receiver verification; The dedicated adapter for receiver verification can connect the output terminal of the function signal generator to the positive input terminal of the eddy current instrument receiver; Connect the GND terminal of the function signal generator to the GND terminal of the eddy current instrument and the negative input terminal of the receiver; The multi-channel eddy current instrument has multiple built-in receivers. According to different verification requirements, multiple receivers can be turned on simultaneously or one by one by controlling the on and off of multiple relays; The control of the relay is realized by adding a digital output module in the adapter.

2. The multi-channel eddy current instrument calibration equipment according to claim 1, characterized in that: The generating verification adapter includes a first resistor connected between the connection point of the first relay and the channel input terminal of the oscilloscope and the first signal line.

3. The multi-channel eddy current instrument calibration device according to claim 1, characterized in that: The receiving verification adapter includes a second resistor connected between the connection point of the second relay and the output terminal of the function signal generator and the second signal line.

4. A calibration method for the multi-channel eddy current instrument calibration equipment according to any one of claims 1-3, characterized in that, It includes the following steps: A. Verification of the generator; B. Verification of the receiver; Among them, A. The verification of the generator includes the following steps: A1. Connect the eddy current instrument, oscilloscope, verification computer, and generating verification adapter; A2. Connect the signal between the verification computer and the eddy current instrument and the oscilloscope; A3. Check the preset eddy current instrument configuration, oscilloscope configuration, and verification plan configuration; A4. Initialize the eddy current instrument and the oscilloscope according to the preset configuration; A5. Control the generating verification adapter to turn on one of the generators; A6. Modify the frequency and amplitude of the generator output according to the verification plan configuration; A7. Adjust the horizontal and vertical scaling of the oscilloscope according to the frequency and amplitude of the generator; A8. Verify that the computer reads the frequency and amplitude measured by the oscilloscope; A9. Repeat steps A6 - A8 until the verification of all frequencies and amplitudes is completed; A10. Repeat steps A5 - A9 to complete the verification of the remaining generators one by one; Among them, the verification of the receiver includes the following steps: B1. Connect the eddy current instrument, function signal generator, verification computer, and receiver verification adapter; B2. Connect the verification computer to the eddy current instrument and the function signal generator for signal connection; B3. Check the preset configurations of the eddy current instrument, function signal generator, and verification plan; B4. Initialize the eddy current instrument and the function signal generator according to the preset configurations; B5. Control the special adapter for receiver verification to make only one positive input terminal conduct; B6. Modify the frequency and sampling rate of the eddy current instrument according to the verification plan configuration; B7. Modify the amplitude and frequency of the function signal generator according to the verification plan configuration so that its frequency is slightly different from that of the eddy current instrument; B8. Record the eddy current data for a period of time and calculate the verification results according to the current verification item; B9. Repeat steps B6 - B8 to complete the verification of all frequencies; B10. Repeat steps B5 - B9 to complete the verification of all receivers.

5. The verification method according to claim 4, characterized in that: The verification computer is connected to the function signal generator via Ethernet or USB or GPIB.

6. The verification method according to claim 4, characterized in that: The verification computer is connected to the oscilloscope via Ethernet or USB or GPIB.

7. The verification method according to claim 4, characterized in that: The eddy current instrument and the verification computer communicate via Ethernet connection.

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