CN101231266A - A detection system for an electromagnetic non-destructive testing probe - Google Patents

Abstract

The invention discloses an examining system of an electromagnetic nondestructive examination probe, which comprises examining equipment and signal processing equipment, wherein, the examining equipment sends each characteristic parameter thereof to the signal processing equipment, receives parameters which are interrelated with the examining equipment being processed by the signal processing equipment, and amends each characteristic parameter of the examining equipment according to the interrelated parameters; the signal processing equipment sends corresponding running parameter to the examining equipment, sets the examining mode of the examining equipment, starts the interrelated parts of the signal processing equipment according to the examining mode, adjusts and converts the examining signals received from the examining equipment, and analyses and processes the converted signals. Multiple electromagnetic nondestructive examining modes such as examination of eddy current in any waveform, the magnetic leakage examination of the ferromagnetism part after field excitation and the magnetic memory examination of ferromagnetism part, etc. are realized respectively through the running mode of each part of the examining equipment and the signal processing equipment of the invention.

Description

A detection system for an electromagnetic non-destructive testing probe

technical field

The invention relates to a detection system of an electromagnetic non-destructive detection probe, in particular to a detection system of an electromagnetic non-destructive detection probe with the functions of eddy current detection, magnetic flux leakage detection and magnetic memory detection.

Background technique

As the requirements for quality monitoring become more and more stringent, higher requirements are also put forward for non-destructive testing technology. Non-destructive testing technology can reflect the overall industrial technology level of departments, industries, regions and even countries, and can bring obvious benefits. In industrially developed countries, non-destructive testing has become the four key technologies alongside design, materials, and manufacturing (process). Advances in machinery, petrochemicals, aviation, aerospace, automobiles, pressure vessels, railways, roads, nuclear industries and many other related industries and technical fields play an important role.

Eddy current testing, magnetic flux leakage testing and magnetic memory testing are all non-destructive testing methods based on electromagnetic fields. Traditional eddy current methods have problems in both large-area scanning and deep defect detection. For high-resolution large-area eddy current testing, array eddy current probes have more advantages than traditional mechanical scanning probes. Magnetic flux leakage detection is the detection of the surface and near surface of the magnetized ferromagnetic material, and the leakage magnetic field is formed at the defect. Through the detection of the leakage magnetic field, the defect can be studied and analyzed. Magnetic memory detection technology is an effective method for early diagnosis of ferromagnetic metal parts based on the magnetoelastic effect of ferromagnets and the irreversible effect of leakage magnetic field, and can quickly detect the location of defects. Eddy current detection is based on dynamic electromagnetic field detection method; magnetic flux leakage detection uses DC, AC or permanent magnets to excite the measured area, and uses static magnetic field or dynamic magnetic field detection method; magnetic memory uses static electromagnetic field as the magnetization source. In these kinds of electromagnetic nondestructive testing system methods, the accurate measurement of the electromagnetic field becomes the key. Electromagnetic nondestructive testing technologies such as eddy current testing, magnetic flux leakage testing, and magnetic memory testing are also being continuously improved and developed. However, these technologies are generally regarded independently and developed separately. The user cost of these technologies has doubled.

Contents of the invention

In order to solve the above problems and defects, the present invention provides an electromagnetic nondestructive testing system.

The present invention is achieved through the following technical solutions:

An electromagnetic nondestructive testing system involved in the present invention includes:

The detection device sends each characteristic parameter of the device to the signal processing device, and receives the parameters related to the detection device processed by the signal processing device, and corrects the characteristic parameters of the detection device according to the relevant parameters;

The signal processing equipment sends the corresponding working parameters to the detection equipment, and sets its detection mode, and starts the relevant components of the signal processing equipment according to the detection mode, then adjusts and converts the received detection signal, and converts the converted The signal is analyzed and processed, and the processed signal is output to a printing unit or a storage unit.

The detection device also includes: a storage unit, which stores the characteristic parameters of each component of the detection device; a control unit, which controls the operation of the storage unit and the multiplexing unit, realizes the communication between the detection device and the signal processing device, and controls each parameter carry out mutual transmission; the giant magnetic sensing unit includes the X-direction magnetic field giant magnetic sensing unit and the Y-direction magnetic field giant magnetic sensing unit, and transmits the detection signals output by each array element to the multi-channel conversion unit; the multi-channel conversion unit, The received detection signals of each array element are transmitted to the signal processing equipment through the preamplifier.

The signal processing device includes: a signal conditioning unit, which receives the detection signal output by each array element of the giant magnetic sensing unit in the detection device, and conditions the signal so that the signal after conditioning is suitable for the conversion unit. The working range is then output to the conversion unit; the conversion unit receives the detection signal conditioned by the conditioning unit, and performs analog-to-digital conversion on the detection signal, and then transmits the converted analog signal to the field programmable gate array; the storage unit , the detection signal will be stored through the FPGA (Field Programmable Gate Array) and the central processing unit, and the work space required for data processing will be provided.

The beneficial effects of the technical solution provided by the invention are:

Through the detection system, under the condition of not changing the sensing probe, the probe using the two-dimensional magnetic field giant magnetic sensing array can perform eddy current, magnetic flux leakage and magnetic memory detection, and unify the nondestructive testing technology based on dynamic electromagnetic field and static electromagnetic field. Carry out multiple methods of collaborative detection to improve the reliability of detection.

Description of drawings

Figure 1 is a structural diagram of the detection system.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings:

This embodiment provides an electromagnetic nondestructive testing system.

Referring to Figure 1, the system realizes the detection functions of different electromagnetic non-destructive testing systems such as eddy current testing, magnetic flux leakage testing and magnetic memory testing through analog and digital signal processing, and realizes eddy current testing, Integrated detection such as magnetic flux leakage detection and magnetic memory detection. It mainly includes: detection equipment and signal processing equipment, wherein the detection equipment includes: giant magnetic sensing unit, control unit, storage unit and multiplex conversion unit. The giant magnetic sensing unit includes: an X-direction magnetic field giant magnetic sensor array 2 and a Y-direction magnetic field giant magnetic sensor array 3, and the signal is transmitted to the multiplexing unit 5, and transmitted to the signal through the preamplifier 9 Handling equipment. The detection device also includes a control unit, the operation of the FLASH storage unit 4 and the multiplexing unit 5 is controlled by the CPLD control unit 6, and the parameters between the detection device and the signal processing device are mutually transmitted, wherein the control unit is also connected to the photoelectric The encoder 1 is used to detect the position of the detection device to realize the positioning of the detection device.

Signal processing equipment: including signal conditioning unit, conversion unit and storage unit. When the detection signal of the detection equipment is output to the signal processing equipment, at first the signal is conditioned by the signal conditioning unit 11 and then transmitted to the A/D converter 13 in the conversion unit for analog-to-digital conversion, and then transmitted to the FPGA14 ( Field Programmable Gate Array, Field Programmable Gate Array) for processing, and the processed signal is stored by the FLASH memory 17 and SDRAM memory 15 through the central processing unit 16 or printed 19 by the printer through the communication interface 18. According to the detection method, the FPGA 14 converts the corresponding signal through the D/A converter 12 to digital-to-analog conversion, then transmits it to the power amplification unit 10, and then outputs it to the magnetic field bias coil 7 and the excitation coil 8 in the detection device.

The electromagnetic nondestructive testing system performs eddy current testing, magnetic flux leakage testing and magnetic memory testing through the following technical solutions:

Eddy current detection: CPU16 sets the excitation waveform of eddy current detection according to the detection requirements, including sine wave, pulse wave or other arbitrary waveforms, and outputs the waveform to FPGA14 after discrete, and FPGA14 outputs according to a certain timing and frequency according to the discrete waveform data In the D/A converter 12, the waveform output by the D/A converter 12 is amplified by the power amplification unit 10 and output to the magnetic field bias coil 7 and the excitation coil 8 in the detection device respectively, and the magnetic field generated by the bias coil 7 is used In order to provide the working magnetic field of the y-direction magnetic field giant magnetic sensor array 3, the excitation coil 8 is used to generate the excitation magnetic field required for eddy current detection; the y-direction magnetic field giant magnetic sensor array 3 is used to receive the eddy current detection signal, and the received detection signal passes through The multiplexing unit 5 is amplified by the preamplifier 9 and then output to the signal conditioning unit 11 to make it suitable for the working range of the A/D converter 13, and the adjusted eddy current detection signal is converted from analog to digital through the A/D converter 13 Conversion, the converted digital signal is output to FPGA14, and then output to CPU16 after digital filtering and signal analysis processing, and CPU16 displays the processed received signal with printing unit 19, or outputs it to other memory, Network, etc., to realize eddy current testing of arbitrary waveforms.

Magnetic flux leakage detection: The ferromagnetic parts to be tested are detected after being magnetized by DC, AC or permanent magnets. The x-direction magnetic field giant magnetic sensor array 2 in the probe is used to receive the magnetic flux leakage detection signal, and the received detection signal passes through the multi-channel conversion unit 5. After being amplified by the preamplifier 9, it is output to the signal conditioning unit 11 to make it suitable for the working range of the A/D converter 13. The conditioned detection signal is converted from analog to digital by the A/D converter 13, and the converted The analog signal is output to FPGA14, after digital filtering, signal analysis and processing, it is output to CPU16, and CPU16 displays the processed received signal with printing unit 19, or outputs it to other memory, network, etc. through communication interface 18, to realize Magnetic flux leakage detection.

Magnetic memory detection: detect the ferromagnetic parts to be tested after being magnetized by the earth’s magnetic field, the x-direction magnetic field giant magnetic sensor array 2 in the probe is used to receive the magnetic memory detection signal, and the received detection signal passes through the multiplex conversion unit 5 through The preamplifier 9 is amplified and output to the signal conditioning unit 11 to make it suitable for the working range of the A/D converter 13. The conditioned detection signal is converted from analog to digital by the A/D converter 13, and the converted analog signal Output to FPGA14, perform digital filtering, signal analysis and processing, and then output to CPU16, CPU16 will display the processed received signal and print unit 19, or output to other memory, network, etc. through communication interface 18, to realize magnetic memory detection.

This embodiment provides a testing system capable of integrating various electromagnetic nondestructive testing functions such as eddy current testing, magnetic flux leakage testing, and magnetic memory testing, which not only simplifies the design of the testing system, but also reduces testing costs.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (8)

1. A detection system of an electromagnetic nondestructive testing probe, characterized in that the system comprises: The detection device sends each characteristic parameter of the device to the signal processing device, and receives the parameters related to the detection device processed by the signal processing device, and corrects the characteristic parameters of the detection device according to the received relevant parameters; The signal processing equipment sends the corresponding detection mode to the detection equipment according to the detection requirements, receives the characteristic parameters of each component of the detection equipment, and detects the relevant components activated according to the detection mode. 2. The detection system of the electromagnetic nondestructive testing probe according to claim 1, wherein the detection equipment further comprises: The storage unit stores the characteristic parameters of each component of the detection device; The control unit controls the operation of the storage unit and the multiplexing unit, and transmits the parameters between the detection device and the signal processing device; The giant magnetic sensing unit includes an X-direction magnetic field giant magnetic sensor array and a Y-direction magnetic field giant magnetic sensor array, and the giant magnetic sensing unit also outputs the detection signals of each array element to multiple channels according to the set detection method. conversion unit; The multiplexing unit outputs the received detection signal to the signal processing device through the preamplifier. 3. The detection system of the electromagnetic nondestructive testing probe according to claim 1, wherein the signal processing equipment comprises: A signal conditioning unit, receiving the detection signal output by the giant magnetic sensing unit in the detection device, and conditioning the signal, so that the conditioned signal is suitable for the working range required by the conversion unit, and then output to the conversion unit; The conversion unit receives the detection signal conditioned by the conditioning unit, performs analog-to-digital conversion on the detection signal, and then transmits the converted analog signal to the field programmable gate array; The storage unit stores the signals transmitted by the field programmable gate array and the central processing unit and provides storage space required for signal processing. 4. The detection system of the electromagnetic non-destructive testing probe according to claim 1, wherein the detection methods include: eddy current detection, magnetic flux leakage detection and magnetic memory detection. 5. The detection system of the electromagnetic non-destructive testing probe according to claim 4, wherein, when the detection system is an eddy current detection mode, at first the central processing unit in the signal processing device sets the excitation of the eddy current detection according to the detection requirements Waveform, and after the waveform is discrete, output to the field programmable gate array and digital-to-analog conversion, and then output to the detection device after power amplification by the power amplification unit. 6. The detection system of the electromagnetic nondestructive testing probe according to claim 4, characterized in that, when the detection system performs eddy current detection, magnetic flux leakage detection and magnetic memory detection, it also includes: a giant magnetic sensor array element in the detection equipment The received detection signal is transmitted to the signal conditioning unit in the signal processing device, and then transmitted to the programmable gate array after being converted from analog to digital by the converter. 7. The detection system of the electromagnetic non-destructive testing probe according to claim 3 or 6, wherein the field programmable gate array filters the received analog signal, analyzes the signal and processes it and transmits it to the central processing unit, Then display or store. 8. The detection system of the electromagnetic non-destructive testing probe according to claims 1-7, characterized in that the system can integrate the functions of eddy current detection, magnetic flux leakage detection and magnetic memory detection.

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