CN105425684A - Data acquisition method and device based on FPGA control - Google Patents
Data acquisition method and device based on FPGA control Download PDFInfo
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- CN105425684A CN105425684A CN201511000382.9A CN201511000382A CN105425684A CN 105425684 A CN105425684 A CN 105425684A CN 201511000382 A CN201511000382 A CN 201511000382A CN 105425684 A CN105425684 A CN 105425684A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
- G05B19/0425—Safety, monitoring
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2612—Data acquisition interface
Abstract
The invention discloses a data acquisition method and device based on FPGA control. The method comprises the following key steps that S1 an upper computer downwardly transmits a command to an FPGA chip via a USB; S2 the received command is analyzed, and electromagnetic ultrasonic detection or magnetic leakage detection is judged; S3 if the judgment result indicates electromagnetic ultrasonic detection, gating of A input is performed by a 2-1MUX module, and a pulse generation module generates an excitation signal to perform electromagnetic ultrasonic detection and data acquisition; and if the judgment result indicates magnetic leakage detection, gating of B input is performed by the 2-1MUX module, and magnetic leakage detection and data acquisition are performed. The invention also discloses the data acquisition device. Magnetic leakage detection and electromagnetic ultrasonic detection are successfully combined together based on FPGA chip control, connection with the upper computer is realized through the USB interface and the structure is enabled to be compact so that miniaturization of the device is facilitated and onside use is convenient.
Description
Technical field
The present invention relates to field of non destructive testing, be specifically related to a kind of collecting method based on FPGA control and device.
Background technology
The ferromagnetic components such as steel pipe, steel plate, cable are widely used in the fields such as oil, chemical industry, bridge, they in use may produce the failure modes such as burn into crackle, wall thickness reduction, thus cause the existence of potential safety hazard, jeopardize commercial production safety and people's property interest, for this reason, periodic detection is carried out to above ferromagnetic component.Leakage field and electromagnetic acoustic two kinds of lossless detection methods all have noncontact, require lower advantage to ferromagnetic component surface appearance, are often used to detect ferromagnetic component.
But, two kinds of methods also Shortcomings, Magnetic Flux Leakage Inspecting is as more responsive in etch pit etc. to volume flaw, is difficult to detect uniform wall thickness thinning; Electromagnetic acoustic is then sensitive to crackle class face type defects detection, and can realize component wall thickness measuring, and two kinds of detection methods are combined with each other effectively, then can accomplish to have complementary advantages, and overcomes the limitation of single method.Such as: when Magnetic Flux Leakage Inspecting and high-frequency electromagnetic ULTRASONIC COMPLEX, utilize leakage field method to complete defects detection, and utilize electromagnetic acoustic to complete thickness measuring, wall thickness loss can be detected while guarantee flaw detection sensitivity; Magnetic Flux Leakage Inspecting and low frequency electromagnetic supersonic guide-wave compound tense, low frequency electromagnetic supersonic guide-wave can be utilized to detect whole cross section metal efficiently, complete Rough Inspection process, then leakage field method is utilized to detect defectiveness region targetedly, obtain more accurate defect information, detection efficiency can be improved while guarantee accuracy of detection thus.As can be seen here, leakage field and electromagnetic acoustic compound detection can improve detection efficiency, expand sensing range, detect ferromagnetic component more accurate and comprehensively, be with a wide range of applications.
The detection method that patent document discloses a kind of electromagnetic acoustic and leakage field compound of publication number CN102661995B, mainly for the compound of detection probe, is specifically related to the spatial relation of electromagnetic acoustic coil, Magnetic Flux Leakage Inspecting element and magnetic core, permanent magnet.The people such as Shang Yanwei [Shang Yanwei. boiler water-wall tube leakage field and electromagnetic acoustic complex detection system are developed [D]. Hubei: the Central China University of Science and Technology, 2012] only have developed leakage field and electromagnetic ultrasonic thickness measuring detecting sensor, corresponding hardware handles system adopts two to overlap independently host computer and slave computer and realizes leakage field and electromagnetic ultrasonic thickness measuring respectively, systems bulky, complex structure, onsite application is inconvenient.
Therefore, how to control Combined Mining collection electromagnetic acoustic and Analysis of Magnetic Flux Leakage Testing Signals and upload in host computer, needing follow-up further investigation.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides a kind of collecting method based on FPGA control and device, its object is to, control Magnetic Flux Leakage Inspecting and electromagnetic acoustic to detect to combine by fpga chip, combine two kinds of advantages detected, PFGA chip connects host computer by USB interface, makes the compact conformation of device, volume is little, facilitates onsite application.
For achieving the above object, according to one aspect of the present invention, provide a kind of collecting method controlled based on FPGA, it is characterized in that, comprise the following steps:
S1: host computer passes to fpga chip by USB interface by under order, stored in the demanded storage module of fpga chip, described order comprises action command and parameter command;
Described order in command analysis module resolve command memory module in S2:FPGA chip, judges it is that electromagnetic acoustic detects or Magnetic Flux Leakage Inspecting according to command analysis result,
If electromagnetic acoustic detects, then command analysis result is passed to pulse generating module, electromagnetic ultrasonic signal cache module and 2-1MUX module, described pulse generating module, electromagnetic ultrasonic signal cache module and 2-1MUX module are all arranged in described fpga chip, then enter step S3;
If Magnetic Flux Leakage Inspecting, then command analysis result is passed to magnetic leakage signal cache module and described 2-1MUX module, described magnetic leakage signal cache module is arranged in described fpga chip, then enters step S4;
S3: described 2-1MUX module gating A inputs, described pulse generating module produces corresponding pumping signal according to the command analysis result received in step S2, described pumping signal is used in object to be detected, inspiring electromagnetic ultrasonic wave and then carrying out electromagnetic acoustic detection
Start to carry out gathering the electromagnetic ultrasonic signal carrying object defect information to be detected while generation pumping signal, be specially, the electromagnetic ultrasonic signal of object defect information to be detected that what described fpga chip received carry is written into described electromagnetic ultrasonic signal cache module
At the end of once sampling, the electromagnetic ultrasonic signal carrying object defect information to be detected be buffered is read from described electromagnetic ultrasonic signal cache module, then give described USB interface through described 2-1MUX module transfer, then upload to display and preservation in described host computer
Deng beginning of sampling next time, repeat this step, until described fpga chip receives ceasing and desisting order of sending from described host computer, stop electromagnetic acoustic detecting;
S4: described 2-1MUX module gating B inputs, and the leakage field collection signal that described fpga chip receives is written into described magnetic leakage signal cache module,
When arriving the sampling depth set, read the leakage field collection signal of buffer memory from described magnetic leakage signal cache module, through described 2-1MUX module transfer to described USB interface, then be uploaded to display and preservation in described host computer,
Read leakage field collection signal from described magnetic leakage signal cache module while, new leakage field image data is still ceaselessly being written in described magnetic leakage signal cache module, until described fpga chip receives the halt instruction from described host computer, stop Magnetic Flux Leakage Inspecting.
In above inventive method, fpga chip comprises pulse generating module, 2-1MUX module, electromagnetic ultrasonic signal cache module, magnetic leakage signal cache module, command analysis module and demanded storage module, by the order of host computer sending action and parameter command, through demanded storage module, buffer memory is carried out to above order, by command analysis module order resolved again and judge, performing corresponding detection and the collection of data according to command analysis result.Pulse generating module, 2-1MUX module, electromagnetic ultrasonic signal cache module, in conjunction with USB interface, realize electromagnetic acoustic and detect.Magnetic leakage signal cache module and 2-1MUX module realize Magnetic Flux Leakage Inspecting.
Further, in step S1, described parameter command comprises the number of cycles of sampling depth, sampling time, the frequency of pumping signal, the phase place of pumping signal, the amplitude of pumping signal and pumping signal.
Further, in described step S1, described action command comprise start gather and stop gather.
Further, described electromagnetic ultrasonic signal cache module adopts SRAM or SDRAM to realize.
Further, described magnetic leakage signal cache module adopts asynchronous FIFO to realize, and asynchronous FIFO realizes writing slowly reading soon, and reading and writing are independent of each other.
Further, described demanded storage module adopts two-port RAM to realize.
According to another aspect of the present invention, provide a kind of data collector controlled based on FPGA, it is characterized in that, it comprises host computer, USB interface, fpga chip, D/A module, Current amplifier module, electromagnetic ultrasonic signal conditioning module, high-speed a/d module, magnetic leakage signal conditioning module, low speed A/D module, electromagnetic acoustic incentive probe, electromagnetic acoustic receiving transducer and magnetic leakage probe, wherein
Described fpga chip comprises electromagnetic ultrasonic signal cache module, magnetic leakage signal cache module and pulse generating module,
Described host computer is electrically connected with described fpga chip by described USB interface, below passes order and uploading data,
The input end of described D/A module is connected with the output terminal of described pulse generating module, to convert pulse digital signal to analog signal output,
The input end of described Current amplifier module is connected with the output terminal of described D/A module, KV level is amplified to by lying prostrate level with the simulating signal described D/A module converts obtained, reload on described electromagnetic acoustic incentive probe, in object to be detected, produce electromagnetic ultrasonic wave
The input end of described electromagnetic ultrasonic signal conditioning module is connected with the output terminal of described electromagnetic acoustic receiving transducer, to nurse one's health the induced voltage carrying object defect information to be detected that described electromagnetic acoustic receiving transducer produces,
The input end of described high-speed a/d module is connected with the output terminal of described electromagnetic ultrasonic signal conditioning module, so that the induced voltage after described electromagnetic ultrasonic signal conditioning module conditioning is converted to digital signal,
The input end of described electromagnetic ultrasonic signal cache module is connected with the output terminal of described high-speed a/d module, temporarily to store the digital signal that described high-speed a/d module converts obtains,
The input end of described magnetic leakage signal conditioning module is connected with the output terminal of described magnetic leakage probe, to nurse one's health the output voltage of described magnetic leakage probe,
The input end of described low speed A/D module is connected with the output terminal of described magnetic leakage signal conditioning module, so that the signal after described magnetic leakage signal conditioning module conditioning is converted to digital signal,
The input end of described magnetic leakage signal cache module is connected with the output terminal of described low speed A/D module, temporarily to store the digital signal that described low speed A/D module converts obtains.
Further, the AD analog input scope of described high-speed a/d module is-5V ~+5V, can accept bipolar signal input.
Further, the AD analog input scope of described low speed A/D module is 0V ~+5V, can accept unipolar signal input.
In general, the above technical scheme conceived by the present invention compared with prior art, can obtain following beneficial effect:
(1) the inventive method utilizes fpga chip as control core, fpga chip comprises multiple module, command analysis module is resolved order and is judged, according to judged result, 2-1MUX module gating A inputs or B input, and then achieving electromagnetic acoustic detection or Magnetic Flux Leakage Inspecting, the inventive method successfully utilizes the control of fpga chip, Magnetic Flux Leakage Inspecting and electromagnetic acoustic is detected and combines.
(2), in apparatus of the present invention, utilize fpga chip, USB interface in conjunction with magnetic leakage probe, magnetic leakage signal conditioning module, low speed A/D module, constitute Magnetic Flux Leakage Testing System, can Magnetic Flux Leakage Inspecting be carried out.Utilize fpga chip, USB interface in conjunction with D/A module, Current amplifier module and electromagnetic acoustic incentive probe, can encourage and produce the electromagnetic ultrasonic wave needed for detecting.This electromagnetic ultrasonic wave is propagated in object to be detected, carries the defect information of object to be detected, through electromagnetic acoustic receiving transducer, electromagnetic ultrasonic signal conditioning module, high-speed a/d module utilize fpga chip and USB interface, realizes electromagnetic acoustic and detects.Order for host computer passes down, the uploading of electromagnetic acoustic and magnetic flux leakage data, and only utilize fpga chip and realize in conjunction with USB interface, its apparatus structure is simply compact, is beneficial to volume miniaturization.
(3) large for electromagnetic acoustic collection signal data volume, sampling rate is high, be interrupted the feature gathered, selected that memory capacity is large, read or write speed be fast but SRAM or the SDRAM storer that can not read while write stores electromagnetism ultrasound acquisition signal; Little for leakage field collection signal data volume, sampling rate is low, the feature of continuous acquisition, selected to read and write the asynchronous FIFO memory be independent of each other and store leakage field collection signal.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet based on the collecting method of FPGA control in the embodiment of the present invention;
Fig. 2 is the principle schematic based on the collecting method of FPGA control in the embodiment of the present invention;
Fig. 3 is the general structure schematic diagram based on the data collector of FPGA control in the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
Fig. 1 is the schematic flow sheet based on the collecting method of FPGA control in the embodiment of the present invention, and as seen from the figure, the collecting method controlled based on FPGA of the present invention, mainly comprises the following steps:
S1: host computer passes to fpga chip by USB interface by under order, stored in the demanded storage module of fpga chip, described demanded storage module for example adopts two-port RAM to realize.Order comprises action command and parameter command, and wherein, described parameter command comprises the number of cycles of sampling depth, sampling time, the frequency of pumping signal, the phase place of pumping signal, the amplitude of pumping signal and pumping signal.Described action command comprise start gather and stop gather.
Described order in command analysis module resolve command memory module in S2:FPGA chip, judges it is that electromagnetic acoustic detects or Magnetic Flux Leakage Inspecting according to command analysis result,
If electromagnetic acoustic detects, then command analysis result is passed to pulse generating module, electromagnetic ultrasonic signal cache module and 2-1MUX module, described pulse generating module, electromagnetic ultrasonic signal cache module and 2-1MUX module are all arranged in described fpga chip.In one embodiment of the invention, electromagnetic ultrasonic signal cache module adopts SRAM or SDRAM to realize.Then step S3 is entered;
If Magnetic Flux Leakage Inspecting, then command analysis result is passed to magnetic leakage signal cache module and described 2-1MUX module.Described magnetic leakage signal cache module is arranged in described fpga chip, and magnetic leakage signal cache module adopts asynchronous FIFO to realize, and asynchronous FIFO realizes writing slowly reading soon, and reading and writing are independent of each other.Then step S4 is entered;
S3: described 2-1MUX module gating A inputs, described pulse generating module produces corresponding pumping signal according to the command analysis result received in step S2, described pumping signal is used in object to be detected, inspiring electromagnetic ultrasonic wave and then carrying out electromagnetic acoustic detection
Start to carry out gathering the electromagnetic ultrasonic signal carrying object defect information to be detected while generation pumping signal, be specially, the electromagnetic ultrasonic signal of object defect information to be detected that what described fpga chip received carry is written into described electromagnetic ultrasonic signal cache module
At the end of once sampling, the electromagnetic ultrasonic signal carrying object defect information to be detected be buffered is read from described electromagnetic ultrasonic signal cache module, then give described USB interface through described 2-1MUX module transfer, then upload to display and preservation in described host computer
Deng beginning of sampling next time, repeat this step, until described fpga chip receives ceasing and desisting order of sending from described host computer, stop electromagnetic acoustic detecting;
S4: described 2-1MUX module gating B inputs, and the leakage field collection signal that described fpga chip receives is written into described magnetic leakage signal cache module,
When arriving the sampling depth set, read the leakage field collection signal of buffer memory from described magnetic leakage signal cache module, through described 2-1MUX module transfer to described USB interface, then be uploaded to display and preservation in described host computer,
Read leakage field collection signal from described magnetic leakage signal cache module while, new leakage field image data is still ceaselessly being written in described magnetic leakage signal cache module, until described fpga chip receives the halt instruction from described host computer, stop Magnetic Flux Leakage Inspecting.
Fig. 2 is the principle schematic based on the collecting method of FPGA control in the embodiment of the present invention, and wherein, solid arrow represents control signal, and hollow arrow represents digital signal.As seen from the figure, fpga chip comprises pulse generating module, 2-1MUX module, electromagnetic ultrasonic signal cache module, magnetic leakage signal cache module, command analysis module and demanded storage module.The effect of host computer passes order and storage of collected data under being.The effect of USB interface is biography, uploading of electromagnetic acoustic data and the uploading of magnetic flux leakage data down of being responsible for order.The effect of 2-1MUX module is when detecting for electromagnetic acoustic, is connected by electromagnetic ultrasonic signal cache module, and when being Magnetic Flux Leakage Inspecting, is then connected with USB interface by magnetic leakage signal cache module with USB interface.The effect of demanded storage module is the order of buffer memory from host computer.The effect of command analysis module is resolved the order from host computer, and command analysis result is passed to corresponding module.The effect of magnetic leakage signal cache module is temporarily stored by the leakage field collection signal entering fpga chip, when reaching the sampling depth of setting, then is transferred to USB interface together and uploads in host computer.The effect of electromagnetic ultrasonic signal cache module is temporarily stored the electromagnetic acoustic sampled signal entering fpga chip, when end of once sampling, is transferred to USB interface and is uploaded in host computer.The effect of pulse generating module produces corresponding pulse excitation signal according to command analysis result.
Fig. 3 is the general structure schematic diagram based on the data collector of FPGA control in the embodiment of the present invention.As seen from the figure, the data collector controlled based on FPGA mainly comprises host computer, USB interface, fpga chip, D/A module, Current amplifier module, electromagnetic ultrasonic signal conditioning module, high-speed a/d module, magnetic leakage signal conditioning module, low speed A/D module, electromagnetic acoustic incentive probe, electromagnetic acoustic receiving transducer and magnetic leakage probe.
Wherein, described fpga chip comprises electromagnetic ultrasonic signal cache module, magnetic leakage signal cache module and pulse generating module.Described host computer is electrically connected with described fpga chip by described USB interface, below passes order and uploading data.The input end of described D/A module is connected with the output terminal of described pulse generating module, to convert pulse digital signal to analog signal output.The input end of described Current amplifier module is connected with the output terminal of described D/A module, KV level is amplified to by lying prostrate level with the simulating signal described D/A module converts obtained, reload on described electromagnetic acoustic incentive probe, in object to be detected, produce electromagnetic ultrasonic wave.The input end of described electromagnetic ultrasonic signal conditioning module is connected with the output terminal of described electromagnetic acoustic receiving transducer, to nurse one's health the induced voltage carrying object defect information to be detected that described electromagnetic acoustic receiving transducer produces.This electromagnetic ultrasonic signal conditioning module has the functions such as gain amplification, bandpass filtering.The input end of described high-speed a/d module is connected with the output terminal of described electromagnetic ultrasonic signal conditioning module, so that the induced voltage after described electromagnetic ultrasonic signal conditioning module conditioning is converted to digital signal.The input end of described electromagnetic ultrasonic signal cache module is connected with the output terminal of described high-speed a/d module, temporarily to store the digital signal that described high-speed a/d module converts obtains.The input end of described magnetic leakage signal conditioning module is connected with the output terminal of described magnetic leakage probe, to nurse one's health the output voltage of described magnetic leakage probe.This magnetic leakage signal conditioning module has the function such as gain-adjusted, multi-center selection.The input end of described low speed A/D module is connected with the output terminal of described magnetic leakage signal conditioning module, so that the signal after described magnetic leakage signal conditioning module conditioning is converted to digital signal, the input end of described magnetic leakage signal cache module is connected with the output terminal of described low speed A/D module, temporarily to store the digital signal that described low speed A/D module converts obtains.
In one embodiment of the invention, the AD analog input scope of described high-speed a/d module is-5V ~+5V, can accept bipolar signal input.The AD analog input scope of described low speed A/D module is 0V ~+5V, can accept unipolar signal input.
In the present invention, induced voltage on electromagnetic acoustic receiving transducer is after the process of electromagnetic ultrasonic signal conditioning module, become digital signal to be exactly electromagnetic acoustic collection signal by high-speed a/d cell translation, this electromagnetic acoustic collection signal is transferred in fpga chip and carries out buffer memory and upload.Electromagnetic ultrasonic signal conditioning module carries out gain amplification and bandpass filtering to magnetic ultrasound acquisition signal.The signal of magnetic leakage signal conditioning module to magnetic leakage probe is nursed one's health, comprise gain-adjusted and multi-center selection, the signal after conditioning is transferred to described low speed A/D unit, and the signal after A/D conversion is exactly leakage field collection signal, this signal gives described fpga chip, carries out buffer memory and uploads.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1., based on the collecting method that FPGA controls, it is characterized in that, comprise the following steps:
S1: host computer passes to fpga chip by USB interface by under order, stored in the demanded storage module of fpga chip, described order comprises action command and parameter command;
Described order in command analysis module resolve command memory module in S2:FPGA chip, judges it is that electromagnetic acoustic detects or Magnetic Flux Leakage Inspecting according to command analysis result,
If electromagnetic acoustic detects, then command analysis result is passed to pulse generating module, electromagnetic ultrasonic signal cache module and 2-1MUX module, described pulse generating module, electromagnetic ultrasonic signal cache module and 2-1MUX module are all arranged in described fpga chip, then enter step S3;
If Magnetic Flux Leakage Inspecting, then command analysis result is passed to magnetic leakage signal cache module and described 2-1MUX module, described magnetic leakage signal cache module is arranged in described fpga chip, then enters step S4;
S3: described 2-1MUX module gating A inputs, described pulse generating module produces corresponding pumping signal according to the command analysis result received in step S2, described pumping signal is used in object to be detected, inspiring electromagnetic ultrasonic wave and then carrying out electromagnetic acoustic detection
Start to carry out gathering the electromagnetic ultrasonic signal carrying object defect information to be detected while generation pumping signal, be specially, the electromagnetic ultrasonic signal of object defect information to be detected that what described fpga chip received carry is written into described electromagnetic ultrasonic signal cache module
At the end of once sampling, the electromagnetic ultrasonic signal carrying object defect information to be detected be buffered is read from described electromagnetic ultrasonic signal cache module, then give described USB interface through described 2-1MUX module transfer, then upload to display and preservation in described host computer
Deng beginning of sampling next time, repeat this step, until described fpga chip receives ceasing and desisting order of sending from described host computer, stop electromagnetic acoustic detecting;
S4: described 2-1MUX module gating B inputs, and the leakage field collection signal that described fpga chip receives is written into described magnetic leakage signal cache module,
When arriving the sampling depth set, read the leakage field collection signal of buffer memory from described magnetic leakage signal cache module, through described 2-1MUX module transfer to described USB interface, then be uploaded to display and preservation in described host computer,
Read leakage field collection signal from described magnetic leakage signal cache module while, new leakage field image data is still ceaselessly being written in described magnetic leakage signal cache module, until described fpga chip receives the halt instruction from described host computer, stop Magnetic Flux Leakage Inspecting.
2. as claimed in claim 1 a kind of based on FPGA control collecting method, it is characterized in that, in step S1, described parameter command comprises the number of cycles of sampling depth, sampling time, the frequency of pumping signal, the phase place of pumping signal, the amplitude of pumping signal and pumping signal.
3. as claimed in claim 1 or 2 a kind of based on FPGA control collecting method, it is characterized in that, in described step S1, described action command comprise start gather and stop gather.
4. a kind of collecting method controlled based on FPGA as claimed in claim 3, it is characterized in that, described electromagnetic ultrasonic signal cache module adopts SRAM or SDRAM to realize.
5. a kind of collecting method controlled based on FPGA as described in claim 1 or 4, is characterized in that, described magnetic leakage signal cache module adopts asynchronous FIFO to realize.
6. a kind of collecting method controlled based on FPGA as claimed in claim 5, it is characterized in that, described demanded storage module adopts two-port RAM to realize.
7. the data collector controlled based on FPGA, it is characterized in that, it comprises host computer, USB interface, fpga chip, D/A module, Current amplifier module, electromagnetic ultrasonic signal conditioning module, high-speed a/d module, magnetic leakage signal conditioning module, low speed A/D module, electromagnetic acoustic incentive probe, electromagnetic acoustic receiving transducer and magnetic leakage probe, wherein
Described fpga chip comprises electromagnetic ultrasonic signal cache module, magnetic leakage signal cache module and pulse generating module,
Described host computer is electrically connected with described fpga chip by described USB interface, below passes order and uploading data,
The input end of described D/A module is connected with the output terminal of described pulse generating module, to convert pulse digital signal to analog signal output,
The input end of described Current amplifier module is connected with the output terminal of described D/A module, KV level is amplified to by lying prostrate level with the simulating signal described D/A module converts obtained, reload on described electromagnetic acoustic incentive probe, in object to be detected, produce electromagnetic ultrasonic wave
The input end of described electromagnetic ultrasonic signal conditioning module is connected with the output terminal of described electromagnetic acoustic receiving transducer, to nurse one's health the induced voltage carrying object defect information to be detected that described electromagnetic acoustic receiving transducer produces,
The input end of described high-speed a/d module is connected with the output terminal of described electromagnetic ultrasonic signal conditioning module, so that the induced voltage after described electromagnetic ultrasonic signal conditioning module conditioning is converted to digital signal,
The input end of described electromagnetic ultrasonic signal cache module is connected with the output terminal of described high-speed a/d module, temporarily to store the digital signal that described high-speed a/d module converts obtains,
The input end of described magnetic leakage signal conditioning module is connected with the output terminal of described magnetic leakage probe, to nurse one's health the output voltage of described magnetic leakage probe,
The input end of described low speed A/D module is connected with the output terminal of described magnetic leakage signal conditioning module, so that the signal after described magnetic leakage signal conditioning module conditioning is converted to digital signal,
The input end of described magnetic leakage signal cache module is connected with the output terminal of described low speed A/D module, temporarily to store the digital signal that described low speed A/D module converts obtains.
8. as claimed in claim 7 a kind of based on FPGA control data collector, it is characterized in that, the AD analog input scope of described high-speed a/d module be-5V ~+5V, can accept bipolar signal input.
9. as claimed in claim 8 a kind of based on FPGA control data collector, it is characterized in that, the AD analog input scope of described low speed A/D module is 0V ~+5V, can accept unipolar signal input.
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