CN211044505U - Wireless eddy current detection system based on sparse representation - Google Patents
Wireless eddy current detection system based on sparse representation Download PDFInfo
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Abstract
The utility model relates to a wireless eddy current testing system based on sparse representation belongs to electromagnetism nondestructive test field. The utility model consists of a detection node, a signal preprocessing module, a wireless transmission module and an upper computer, wherein the signal preprocessing module consists of a signal acquisition card, a signal conditioning circuit, a phase-sensitive detection circuit and an ARM processor; the wireless transmission module is a Bluetooth communication suite and comprises a Bluetooth master station and a Bluetooth slave station; the upper computer is a desk workstation. The utility model discloses effectively reduce wireless transmission module's hardware burden among the data transmission process, improved wireless eddy current testing system's detection efficiency greatly.
Description
Technical Field
The utility model relates to a wireless eddy current testing system based on sparse representation belongs to electromagnetism nondestructive test field.
Background
The array eddy current detection technology belongs to the electromagnetic nondestructive detection technology and is an important branch of the development of the nondestructive detection technology. The array eddy current detection technology can realize the quick and efficient detection of a detected object by adopting a reasonable sensor structural design, compared with the single-probe eddy current detection technology, the array eddy current detection technology can achieve the effect of scanning a single probe for multiple times through single scanning, can realize the large-range quick detection of the surface of a detected workpiece, and has the same detection sensitivity to the surface and the near surface of the detected workpiece as the single-probe eddy current detection technology.
When array eddy current detection is carried out on an industrial site, the wireless communication technology can be used for saving a large number of on-site connecting cables, the detection cost is reduced, and the detection efficiency is improved. In the process of carrying out array eddy current testing and transmitting a testing signal by using a wireless communication system, in order to obtain an undistorted eddy current testing signal, the eddy current testing system must sample the testing signals of a plurality of sensors at a frequency specified by the nyquist sampling theorem, so that the data volume of the sampled eddy current testing signal is huge, the workload of a hardware circuit in the eddy current testing system is increased, the transmission of the eddy current testing signal by using the wireless communication module is not facilitated, and the real-time performance of the eddy current testing is reduced.
Therefore, it is very necessary to design a new wireless eddy current testing system, which can still ensure the reconstruction accuracy of the eddy current testing signal at a lower sampling frequency, reduce the data amount of the eddy current testing signal to be stored and transmitted, reduce the workload of the hardware circuit of the eddy current testing system, especially reduce the workload of the wireless communication module, and improve the real-time performance of the eddy current nondestructive testing.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide a wireless eddy current testing system based on sparse representation to when being used for overcoming and adopting wireless array eddy current testing technique to carry out the nondestructive test of vortex to the work piece of being examined, in order to obtain the eddy current testing signal of undistorted, must with the frequency data acquisition that the nyquist sampling theorem stipulated, the eddy current testing signal data bulk that the sampling obtained is big, lead to hardware circuit work load height, wireless communication module transmission burden is heavy, the poor problem of eddy current testing system real-time.
The technical scheme of the utility model is that: a wireless eddy current detection system based on sparse representation is composed of detection nodes, a signal preprocessing module, a wireless transmission module and an upper computer.
The detection node comprises a signal generator and an eddy current array sensor, wherein the signal generator is a signal generation circuit based on a DDS special chip AD9850 and can generate sine waves and square waves as excitation signals; the AD9850 chip is provided with a 32-bit phase accumulator, the ROM is 14 bits, the highest reference clock is 125MHz, the resolution of the output frequency can reach 0.0291Hz, the highest output frequency 62.5MHz is allowed to be generated, and 5bits digital control phase modulation is provided inside the chip; the eddy current array sensor consists of A, B two groups of array sensors which are positioned on the same plane, wherein each group of array sensors consists of three identical array units (the number of the array units can be increased or reduced according to the actual detection requirement); the group A array sensor is an excitation sensor and comprises a1、A2、A3Three array units, wherein the array sensor in the group B is a detection sensor and comprises a group B1、B2、B3The array unit consists of a circular shell and an annular coil; the array units of the excitation sensors are arranged in a triangle, and the array units of the detection sensors are arranged in an inverted triangle.
The signal preprocessing module consists of a signal acquisition card, a signal conditioning circuit, a phase-sensitive detection circuit and an ARM processor.
The signal acquisition card is a Linghua signal acquisition card DAQ2010, supports a 32-bit PCI bus, and has a sampling frequency of 2 MHZ.
The signal conditioning circuit is composed of a double-operation amplifier chip C358C, and can filter out direct current components and high-frequency noise in the circuit.
The phase-sensitive detection circuit is composed of an MC1595 multi-frequency linear four-quadrant multiplier and an NE5532 low-pass filter, wherein the MC1595 multi-frequency linear four-quadrant multiplier is used for multiplying a signal processed by the signal conditioning circuit and a reference signal, outputting a composite signal reflecting the amplitude and phase characteristics of the signal and sending the composite signal into the low-pass filter composed of the NE5532 to remove high-frequency components.
The ARM processor adopts a Cortex-A73 processor, the processor supports an ARMv8-A architecture, data caching can reach 64KB, and compared with the traditional processor, the ARM processor can save 20% of power consumption by comparing with the traditional processor, and the service life of a battery is greatly prolonged.
The wireless transmission module is a B L K-MD-BC04-B Bluetooth communication suite of Bo Luo electronic technology company, and comprises a Bluetooth master station and a Bluetooth slave station, wherein the Bluetooth master station and the Bluetooth slave station support interfaces such as USB, UART and PCM, the power supply is 3.3V, and the output power grade is class 2.
The upper computer is a Daire P5820T-W2123N L CN01 desktop workstation, the CPU model is Intel Xeon W-2123, and the display card chip is NVIDIAQuadro P2000.
The specific connection mode of the system is as follows:
the upper computer is connected with a Bluetooth master station through a GPIB bus, and the Bluetooth master station is communicated with a Bluetooth slave station through a Bluetooth wireless transmission network; the Bluetooth slave station is connected with a signal generator in the detection node through a USB interface, and the signal generator is connected with the excitation sensor group through an RS-232 interface; excitation sensor array unit A1、A2、A3End point C at the center of the ring coil1、C2、C3The welding points are respectively led out of taps, connected to an RX terminal of an RS-232 interface in parallel and connected with a TX terminal of a signal generator through the RS-232 interface to excite the sensor array unit A1、A2、A3The other end point C 'of the annular coil'1、C′2、C′3The welding points are respectively led out of taps and connected with a common grounding end in parallel, namely connected with a grounding pin GND; detection sensor array unit B1、B2、B3End point D at the center of the ring coil1、D2、D3Taps are respectively led out at the ends, the taps are connected to a PFI0 terminal of the PCI interface in parallel, and the PCI interface is connected with a signal acquisition card through a PCI bus to detect an array unit B of the sensor1、B2、B3Another end point D 'of the annular coil'1、D′2、D′3The corresponding output signal pins are respectively led out of taps and connected with a common grounding terminal in parallel, namely connected with a grounding pin GND; the signal acquisition card is connected with the signal conditioning circuit through a PCI bus, the signal conditioning circuit is connected with the phase-sensitive detection circuit through an RS-485 interface, the phase-sensitive detection circuit is connected with the ARM processor through an I/O interface, and the ARM processor is connected with the Bluetooth slave station through a UART interface, so that the detection node, the signal preprocessing module, the wireless transmission module and the upper computer are connected to form a complete wireless eddy current detection system.
The utility model has the advantages that:
(1) compared with the traditional eddy current detection technology, the eddy current array detection technology of the utility model can realize large-area rapid detection and has higher efficiency;
(2) the utility model utilizes the eddy current detection signal obtained in the wireless module transmission detection process, saves the use of a large amount of wires on site, and is easy to realize on-line detection, so that the eddy current nondestructive detection is more convenient to be carried out on site;
(3) the utility model provides a detection node utilizes the method of sparse representation to carry out compression sampling to the eddy current test signal who obtains, has reduced the data volume that wireless transmission module needs the transmission, has reduced wireless transmission module's work load, can further improve detection speed, promotes detection efficiency.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
FIG. 2 is a diagram of the vortex array sensor structure of the present invention;
fig. 3 is a system connection diagram of the present invention;
fig. 4 is a single coil shape of the present invention;
FIG. 5 is a circuit diagram of the signal conditioning circuit of the present invention;
fig. 6 is an application circuit diagram of the bluetooth accessory in the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the following detailed description.
Example 1: as shown in FIG. 1, the wireless eddy current inspection system based on sparse representation comprises an inspection node, a signal preprocessing module, a wireless transmission module and an upper computer.
The detection node consists of a signal generator and an eddy current array sensor; the signal generator is a signal generating circuit based on a DDS special chip AD9850 of AD company, and pulse square waves with the duty ratio of 0.25 are used as excitation signals; the eddy current array sensor consists of A, B two groups of array sensors which are positioned on the same plane, wherein each group of array sensors consists of three identical array units (the number of the array units can be increased or reduced according to the actual detection requirement); the group A array sensor is an excitation sensor and comprises a1、A2、A3Three array units, wherein the array sensor in the group B is a detection sensor and comprises a group B1、B2、B3Three array units, the array unit is composed of a circular shell and a ring-shaped coil, as shown in fig. 4; the array units of the excitation sensors are arranged in a triangle, and the array units of the detection sensors are arranged in an inverted triangle.
The signal preprocessing module consists of a signal acquisition card, a signal conditioning circuit, a phase-sensitive detection circuit and an ARM processor;
the signal acquisition card is a Linghua signal acquisition card DAQ2010, and the sampling frequency is 200 kHz.
As shown in fig. 5, the signal conditioning circuit is composed of a dual operational amplifier chip C358C, and can filter out dc components and high frequency noise generated in the circuit.
The phase sensitive detection circuit is composed of an MC1595 multi-frequency linear four-quadrant multiplier and an NE5532, wherein the MC1595 multiplies the signal processed by the signal conditioning circuit and a reference signal, outputs a composite signal reflecting the amplitude and phase characteristics of the signal, and sends the composite signal into a low-pass filter composed of the NE5532 to remove high-frequency components.
The ARM processor adopts a Cortex-A73 processor, a data buffer memory 64KB and the working frequency of the ARM processor is 2.8 GHz.
As shown in FIG. 6, the wireless transmission module is a Bluetooth communication suite and comprises a Bluetooth master station and a Bluetooth slave station, the wireless transmission module is mainly used for wireless communication between an upper computer and a detection node, the adopted Bluetooth device is a B L K-MD-BC04-B Bluetooth communication module of Boluke electronic technology company, the device is powered by an external 3.3V power supply and sends and receives information through a built-in PCB radio frequency antenna, and the output power level is class 2.
The upper computer is a Daire P5820T-W2123N L CN01 desktop workstation, the CPU model is Intel Xeon W-2123, the dominant frequency is 3.6GHz, the highest Rui frequency is 3.9GHz, and the display card chip is NVIDIA Quadro P2000.
As shown in FIG. 2, a wireless eddy current inspection system based on sparse representation has the following specific connection mode:
the upper computer is connected with a Bluetooth master station through a GPIB bus, and the Bluetooth master station is communicated with a Bluetooth slave station through a Bluetooth wireless transmission network; the Bluetooth slave station is connected with a signal generator in the detection node through a USB interface, and the signal generator is connected with the excitation sensor group through an RS-232 interface; excitation sensor array unit A1、A2、A3End point C at the center of the ring coil1、C2、C3The welding points are respectively led out of taps, connected to an RX terminal of an RS-232 interface in parallel and connected with a TX terminal of a signal generator through the RS-232 interface to excite the sensor array unit A1、A2、A3The other end point C 'of the annular coil'1、C′2、C′3The welding points are respectively led out of taps and connected with a common grounding end in parallel, namely connected with a grounding pin GND; detection sensor array unit B1、B2、B3End point D at the center of the ring coil1、D2、D3Taps are respectively led out at the ends, the taps are connected to a PFI0 terminal of the PCI interface in parallel, and the PCI interface is connected with a signal acquisition card through a PCI bus to detect an array unit B of the sensor1、B2、B3Another end point D 'of the annular coil'1、D′2、D′3The corresponding output signal pins are respectively led out of taps and connected with a common grounding terminal in parallel, namely connected with a grounding pin GND; the signal acquisition card is connected with the signal conditioning circuit through a PCI bus, the signal conditioning circuit is connected with the phase-sensitive detection circuit through an RS-485 interface, the phase-sensitive detection circuit is connected with the ARM processor through an I/O interface, and the ARM processor is connected with the Bluetooth slave station through a UART interface, so that the detection node, the signal preprocessing module, the wireless transmission module and the upper computer are connected to form a complete wireless eddy current detection system.
The working process of the system is as follows:
1: setting excitation signal parameters in the upper computer, and transmitting the excitation signal parameters to a Bluetooth master station of the wireless transmission module through a GPIB bus;
2: the Bluetooth master station communicates with the Bluetooth slave station through a Bluetooth wireless transmission network, and the Bluetooth slave station sends excitation signal parameters to a signal generator in the detection node through a USB interface;
3: the signal generator generates a corresponding pulse excitation signal according to the received excitation signal parameters and loads the pulse excitation signal to an excitation sensor array unit in the eddy current array sensor through an RS-232 interface;
4: the excitation sensor array unit is influenced by an excitation signal to generate an excitation magnetic field acting on a to-be-tested piece, and the to-be-tested piece is excited to act on the excitation magnetic field to form an eddy current;
5: the detection sensor array unit in the eddy current array sensor is influenced by a regenerative magnetic field generated by eddy current in a piece to be tested, and forms a synthetic magnetic field, namely an original eddy current detection signal, with an excitation magnetic field generated by an excitation sensor array unit;
6: the signal acquisition card acquires an original eddy current detection signal generated in the detection process, and sends the acquired signal to the signal conditioning circuit in real time through the PCI bus for amplification and denoising;
7: the amplified and denoised signal is transmitted to a phase sensitive detection circuit through an RS-485 interface for processing, and two paths of orthogonal signals, namely eddy current detection preprocessing signals, are output;
8: sending the eddy current detection preprocessing signal to an ARM processor through an I/O interface for sparse representation to obtain a sparse representation coefficient of the eddy current detection signal;
9: the sparse representation coefficient of the eddy current detection signal is sent to the Bluetooth master station through the Bluetooth wireless network by the Bluetooth slave station and then sent to the upper computer for reconstruction, and the defect and damage condition of the test piece to be detected can be evaluated through analysis of the reconstructed signal.
Example 2: a sparse representation-based local key detection mode for deep defects of a wireless eddy current detection system;
as shown in fig. 1 and 3, the wireless eddy current detection system based on sparse representation comprises a detection node, a signal preprocessing module, a wireless transmission module and an upper computer.
The detection node consists of a signal generator and an eddy current array sensor; the signal generator is a signal generating circuit based on a DDS special chip AD9850 of AD company, and pulse square waves with the duty ratio of 0.25 are used as excitation signals; the eddy current array sensor consists of A, B two groups of array sensors which are positioned on the same plane, wherein each group of array sensors consists of three identical array units (the number of the array units can be increased or reduced according to the actual detection requirement); the group A array sensor is an excitation sensor and comprises a1、A2、A3Three array units, wherein the array sensor in the group B is a detection sensor and comprises a group B1、B2、B3The array unit consists of a circular shell and an annular coil; the array units of the excitation sensors are arranged in a triangle, and the array units of the detection sensors are arranged in an inverted triangle.
The signal preprocessing module consists of a signal acquisition card, a signal conditioning circuit, a phase-sensitive detection circuit and an ARM processor.
The signal acquisition card is a Linghua signal acquisition card DAQ2010, and the sampling frequency is 100 KHZ.
The signal conditioning circuit is composed of a double-operation amplifier chip C358C, and can filter out direct current components and high-frequency noise generated in the circuit.
The phase sensitive detection circuit is composed of an MC1595 multi-frequency linear four-quadrant multiplier and an NE5532, wherein the MC1595 multiplies the signal processed by the signal conditioning circuit and a reference signal, outputs a composite signal reflecting the amplitude and phase characteristics of the signal, and sends the composite signal into a low-pass filter composed of the NE5532 to remove high-frequency components.
The ARM processor adopts a Cortex-A73 processor, the data buffer is 64KB, and the working frequency is 2.8 GHz.
The wireless transmission module is a Bluetooth communication suite and comprises a Bluetooth master station and a Bluetooth slave station, the wireless transmission module is mainly used for wireless communication between an upper computer and a detection node, the adopted Bluetooth equipment is a B L K-MD-BC04-B Bluetooth communication module of Bo Luo electronic technology company, the equipment is powered by an external 3.3V power supply and sends and receives information through a built-in PCB radio frequency antenna, and the output power grade is class 2.
The upper computer is a Daire P5820T-W2123N L CN01 desktop workstation, the CPU model is Intel Xeon W-2123, the dominant frequency is 3.6GHz, the highest Rui frequency is 3.9GHz, and the display card chip is NVIDIA Quadro P2000.
The specific connection mode of the system is as follows:
the upper computer is connected with a Bluetooth master station through a GPIB bus, and the Bluetooth master station is communicated with a Bluetooth slave station through a Bluetooth wireless transmission network; the Bluetooth slave station is connected with a signal generator in the detection node through a USB interface, and the signal generator is connected with the excitation sensor group through an RS-232 interface; excitation sensor array unit A1、A2、A3End point C at the center of the ring coil1、C2、C3The welding points are respectively led out of taps, connected to an RX terminal of an RS-232 interface in parallel and connected with a TX terminal of a signal generator through the RS-232 interface to excite the sensorArray unit A1、A2、A3The other end point C 'of the annular coil'1、C′2、C′3The welding points are respectively led out of taps and connected with a common grounding end in parallel, namely connected with a grounding pin GND; detection sensor array unit B1、B2、B3End point D at the center of the ring coil1、D2、D3Taps are respectively led out at the ends, the taps are connected to a PFI0 terminal of the PCI interface in parallel, and the PCI interface is connected with a signal acquisition card through a PCI bus to detect an array unit B of the sensor1、B2、B3Another end point D 'of the annular coil'1、D′2、D′3The corresponding output signal pins are respectively led out of taps and connected with a common grounding terminal in parallel, namely connected with a grounding pin GND; the signal acquisition card is connected with the signal conditioning circuit through a PCI bus, the signal conditioning circuit is connected with the phase-sensitive detection circuit through an RS-485 interface, the phase-sensitive detection circuit is connected with the ARM processor through an I/O interface, and the ARM processor is connected with the Bluetooth slave station through a UART interface, so that the detection node, the signal preprocessing module, the wireless transmission module and the upper computer are connected to form a complete wireless eddy current detection system.
The application scene during the system detection is as follows: when it is known that a test piece to be tested has deep defects, and local emphasis detection needs to be performed on a region of the test piece to be tested having the deep defects so as to obtain specific parameters (such as depth, length, width and the like of the deep defects), a local emphasis detection mode for the deep defects is selected, and the detection mode is used for performing emphasis detection on the region of the test piece to be tested having the deep defects. Due to the influence of skin effect, high-frequency current flowing in the conductor tends to the surface of the conductor, and in order to enable eddy current to reach deeper penetration depth and effectively detect deep defects existing in the test piece, the frequency of the pulse excitation signal is set to be 20kHz which is relatively low.
The system comprises the following specific steps during detection: the method comprises the steps of fixing a detection node above an area of a to-be-detected piece known to have deep defects, setting excitation signal frequency to be 20kHz in an upper computer, sending the excitation signal frequency to a signal generator in the detection node through a wireless transmission module, enabling the signal generator to act on a to-be-detected piece to generate pulse excitation signals with corresponding frequency according to the received excitation signal frequency, and processing and analyzing original eddy current detection signals generated by the to-be-detected piece to obtain specific parameters of the deep defects of the to-be-detected piece.
The present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit and scope of the present invention by those skilled in the art.
Claims (2)
1. A sparse representation-based wireless eddy current inspection system, comprising: the system consists of a detection node, a signal preprocessing module, a wireless transmission module and an upper computer;
the detection node comprises a signal generator and an eddy current array sensor; the signal generator is a signal generating circuit based on a DDS special chip; the eddy current array sensor consists of A, B two groups of array sensors which are positioned on the same plane, each group of array sensors consists of three identical array elements, and each array element is an annular coil; the group A of array sensors are excitation sensor groups and comprise a1、A2、A3Three array units, the array sensors in the group B are detection sensor groups, and the detection sensor group comprises a group B1、B2、B3The three array units, the three excitation sensor array units and the three detection sensor array units are arranged in a triangle;
the signal preprocessing module consists of a signal acquisition card, a signal conditioning circuit, a phase-sensitive detection circuit and an ARM processor;
the wireless transmission module is a Bluetooth communication suite and comprises a Bluetooth master station and a Bluetooth slave station;
the upper computer is a desk workstation.
2. The sparse representation-based wireless eddy current inspection system of claim 1, wherein: the upper computer passes through GThe PIB bus is connected with a Bluetooth master station, and the Bluetooth master station is communicated with a Bluetooth slave station through a Bluetooth wireless transmission network; the Bluetooth slave station is connected with a signal generator in the detection node through a USB interface, and the signal generator is connected with the excitation sensor group through an RS-232 interface; excitation sensor array unit A1、A2、A3End point C at circle center of annular coil1、C2、C3The welding points are respectively led out of taps, connected to an RX terminal of an RS-232 interface in parallel and connected with a TX terminal of a signal generator through the RS-232 interface to excite the sensor array unit A1、A2、A3The other end point C 'of the annular coil'1、C′2、C′3The welding points are respectively led out of taps and connected with a common grounding end in parallel, namely connected with a grounding pin GND; detection sensor array unit B1、B2、B3End point D at circle center of annular coil1、D2、D3Taps are respectively led out at the positions, are connected to a PFI0 terminal of a PCI interface in parallel and are connected with a signal acquisition card through a PCI bus to detect a sensor array unit B1、B2、B3The other end point D 'of the annular coil'1、D′2、D′3The corresponding output signal pins are respectively led out of taps and connected with a common grounding terminal in parallel, namely connected with a grounding pin GND; the signal acquisition card is connected with the signal conditioning circuit through a PCI bus, the signal conditioning circuit is connected with the phase-sensitive detection circuit through an RS-485 interface, the phase-sensitive detection circuit is connected with the ARM processor through an I/O interface, and the ARM processor is connected with the Bluetooth slave station through a UART interface, so that the detection node, the signal preprocessing module, the wireless transmission module and the upper computer are connected to form a complete wireless eddy current detection system.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111223285A (en) * | 2020-03-13 | 2020-06-02 | 昆明理工大学 | Wireless eddy current detection system and method based on sparse representation |
| CN112162031A (en) * | 2020-09-22 | 2021-01-01 | 李月 | 5G network transmission eddy current detection system based on industrial internet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111223285A (en) * | 2020-03-13 | 2020-06-02 | 昆明理工大学 | Wireless eddy current detection system and method based on sparse representation |
| CN111223285B (en) * | 2020-03-13 | 2024-10-18 | 昆明理工大学 | Wireless vortex detection system and method based on sparse representation |
| CN112162031A (en) * | 2020-09-22 | 2021-01-01 | 李月 | 5G network transmission eddy current detection system based on industrial internet |
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