CN205281179U - Data acquisition device based on FPGA control - Google Patents
Data acquisition device based on FPGA control Download PDFInfo
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- CN205281179U CN205281179U CN201521100071.5U CN201521100071U CN205281179U CN 205281179 U CN205281179 U CN 205281179U CN 201521100071 U CN201521100071 U CN 201521100071U CN 205281179 U CN205281179 U CN 205281179U
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Abstract
The utility model discloses a data acquisition device based on FPGA control. It includes host computer, USB interface, FPGA chip, DA module, current amplification module, electromagnetic acoustic signal conditioning module, high -speed AD module, magnetic leakage signal conditioning module, low -speed AD module, electromagnetic acoustic excitation probe, electromagnetic acoustic receiving transducer and magnetic leakage probe, and wherein, the FPGA chip includes electromagnetic acoustic signal cache module, magnetic leakage signal cache module and pulse generation module. The host computer passes through the USB interface with the FPGA chip carries out the electricity and connects to pass order and upload data down. The utility model discloses the success realizes detecting the magnetic leakage for two kinds with electromagnetic acoustic and combines together to FPGA chip control through the USB interface connection host computer, makes compact structure, is favorable to the miniaturization of device.
Description
Technical field
This utility model relates to field of non destructive testing, is specifically related to a kind of based on the FPGA data acquisition unit controlled.
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 are in use likely to produce the failure modes such as burn into crackle, wall thickness reduction, thus causing the existence of potential safety hazard, jeopardize commercial production safety and people's property interest, for this, above ferromagnetic component is carried out periodic detection. Leakage field and two kinds of lossless detection methods of electromagnetic acoustic are respectively provided with noncontact, ferromagnetic component surface appearance are required relatively low advantage, are commonly used for detection ferromagnetic component.
But, two kinds of methods there is also deficiency, and Magnetic Flux Leakage Inspecting is difficult to differentiate between interior wound, it is difficult to detection uniform wall thickness is thinning; The detection sensitivity of electromagnetic acoustic is then usually less than Magnetic Flux Leakage Inspecting, and two kinds of detection methods are combined with each other effectively, then can accomplish to have complementary advantages, overcome 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, can lose by detection wall thickness while ensureing flaw detection sensitivity; Magnetic Flux Leakage Inspecting and low frequency electromagnetic supersonic guide-wave compound tense, available low frequency electromagnetic supersonic guide-wave detects whole cross section metal efficiently, complete Rough Inspection process, then leakage field method is utilized to detect defective region targetedly, obtain more accurate defect information, thus can improve detection efficiency while ensureing accuracy of detection. As can be seen here, leakage field and electromagnetic acoustic compound detection can improve detection efficiency, expand detection range, detect ferromagnetic component more accurate and comprehensively, be with a wide range of applications.
The patent documentation of publication number CN102661995B discloses the detection method of a kind of electromagnetic acoustic and leakage field compound, 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. Shang Yanwei et al. [Shang Yanwei. boiler water-wall tube leakage field develops [D] with electromagnetic acoustic complex detection system. Hubei: the Central China University of Science and Technology, 2012] have developed detection sensor and corresponding upper computer software, but what system adopted be electromagnetic acoustic and leakage field two overlaps independent hardware plan, it does not have accomplishes compound detection truly.
Therefore, how to control Combined Mining collection electromagnetic acoustic and Analysis of Magnetic Flux Leakage Testing Signals and upload in host computer, it is necessary to follow-up further investigation.
Utility model content
Disadvantages described above or Improvement requirement for prior art, this utility model provides a kind of based on the FPGA data acquisition unit controlled, its object is to, control to detect Magnetic Flux Leakage Inspecting and electromagnetic acoustic to combine by fpga chip, the advantage combining two kinds of detections, PFGA chip connects host computer by USB interface so that the compact conformation of device, volume is little.
According to an aspect of the present utility model, provide a kind of based on the FPGA data acquisition unit controlled, it is characterized in that, it is for carrying out the Non-Destructive Testing of steel pipe, it includes 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 includes electromagnetic ultrasonic signal cache module, magnetic leakage signal cache module and pulse generating module,
Described host computer is electrically connected by described USB interface and described fpga chip, below passes order and uploads data,
The input of described D/A module is connected with the outfan of described pulse generating module, to convert pulse digital signal to analog signal output,
The input of described Current amplifier module is connected with the outfan of described D/A module, so that the analogue signal that described D/A module is converted to is amplified to KV level by lying prostrate level, reload on described electromagnetic acoustic incentive probe, object to be detected produces electromagnetic ultrasonic wave
The input of described electromagnetic ultrasonic signal conditioning module is connected with the outfan of described electromagnetic acoustic receiving transducer, so that the induced voltage carrying object defect information to be detected produced on described electromagnetic acoustic receiving transducer is nursed one's health,
The input of described high-speed a/d module is connected with the outfan of described electromagnetic ultrasonic signal conditioning module, is converted to digital signal with the induced voltage after described electromagnetic ultrasonic signal conditioning module being nursed one's health,
The input of described electromagnetic ultrasonic signal cache module is connected with the outfan of described high-speed a/d module, temporarily to store the digital signal that described high-speed a/d module is converted to,
The input of described magnetic leakage signal conditioning module is connected with the outfan of described magnetic leakage probe, nurses one's health with the output voltage to described magnetic leakage probe,
The input of described low speed A/D module is connected with the outfan of described magnetic leakage signal conditioning module, is converted to digital signal with the signal after described magnetic leakage signal conditioning module being nursed one's health,
The input of described magnetic leakage signal cache module is connected with the outfan of described low speed A/D module, temporarily to store the digital signal that described low speed A/D module is converted to.
Further, it is-5V��+5V that the AD of described high-speed a/d module simulates input range, can accept bipolar signal input.
Further, it is 0V��+5V that the AD of described low speed A/D module simulates input range, can accept unipolar signal input.
Of the present utility model additionally provide a kind of based on FPGA control collecting method, it is characterised in that comprise the following steps:
S1: host computer passes to fpga chip by USB interface by under order, is stored in the order memory module of fpga chip, and described order includes action command and parameter command;
The described order in command analysis module resolve command memory module in S2:FPGA chip, judges it is electromagnetic acoustic detection 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 arranged in described fpga chip, subsequently enter step S3;
If Magnetic Flux Leakage Inspecting, then command analysis result being passed to magnetic leakage signal cache module and described 2-1MUX module, described magnetic leakage signal cache module is arranged in described fpga chip, subsequently enters step S4;
S3: described 2-1MUX module gating A input, described pulse generating module produces corresponding pumping signal according to the command analysis result received in step S2, described pumping signal for inspiring electromagnetic ultrasonic wave and then carrying out electromagnetic acoustic detection in object to be detected
Produce pumping signal start simultaneously at the electromagnetic ultrasonic signal being acquired carrying object defect information to be detected, it is 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
When terminating when once sampling, the electromagnetic ultrasonic signal carrying object defect information to be detected being 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
Start Deng sampling next time, repeat this step, until described fpga chip receives from ceasing and desisting order that described host computer sends, stop electromagnetic acoustic detection;
S4: described 2-1MUX module gating B input, the leakage field that described fpga chip receives gathers signal and is written into described magnetic leakage signal cache module,
When arriving the sampling depth set, the leakage field reading buffer memory from described magnetic leakage signal cache module gathers signal, through described 2-1MUX module transfer to described USB interface, then is uploaded in described host computer display and preserves,
While reading leakage field collection signal from described magnetic leakage signal cache module, new leakage field gathers data still in being ceaselessly written into 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 includes pulse generating module, 2-1MUX module, electromagnetic ultrasonic signal cache module, magnetic leakage signal cache module, command analysis module and order memory module, by host computer sending action order and parameter command, through order memory module, above order is carried out buffer memory, by command analysis module order resolved again and judge, performing the collection of corresponding detection and data according to command analysis result. Pulse generating module, 2-1MUX module, electromagnetic ultrasonic signal cache module are in conjunction with USB interface, it is achieved electromagnetic acoustic detects. Magnetic leakage signal cache module and 2-1MUX module realize Magnetic Flux Leakage Inspecting.
Further, in step S1, described parameter command includes 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 includes starting to gather and stop to 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 fast reading slowly, and reading and writing are independent of each other.
Further, described order memory module adopts two-port RAM to realize.
In general, by the contemplated above technical scheme of this utility model compared with prior art, it is possible to obtain following beneficial effect:
(1), in this utility model device, 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, Magnetic Flux Leakage Inspecting can 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 that detection is required. After electromagnetic ultrasonic wave passes from object to be detected, carry the defect information of object to be detected, through electromagnetic acoustic receiving transducer, electromagnetic ultrasonic signal conditioning module, high-speed a/d module and utilize fpga chip and USB interface, it is achieved electromagnetic acoustic detects. The order of host computer is passed down, the uploading of electromagnetic acoustic and magnetic flux leakage data, realize merely with fpga chip and in conjunction with USB interface, its apparatus structure is compact simply, is beneficial to volume miniaturization.
(2) for electromagnetic acoustic collection, signal data amount is big, sample rate is high, be interrupted the feature gathered, and has selected memory capacity is big, read or write speed fast but can not read while write SRAM or SDRAM memory storage electromagnetic acoustic collection signal; For leakage field collection, signal data amount is little, sample rate is low, the feature of continuous acquisition, has selected the asynchronous FIFO memory storage leakage field that read-write is independent of each other to gather signal.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet in this utility model embodiment based on the FPGA collecting method controlled;
Fig. 2 is the principle schematic in this utility model embodiment based on the FPGA collecting method controlled;
Fig. 3 is the population structure schematic diagram in this utility model embodiment based on the FPGA data acquisition unit controlled.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, this utility model is further elaborated. Should be appreciated that specific embodiment described herein is only in order to explain this utility model, be not used to limit this utility model. As long as just can be mutually combined additionally, technical characteristic involved in each embodiment of this utility model disclosed below does not constitute conflict each other.
Fig. 1 is the schematic flow sheet in this utility model embodiment based on the FPGA collecting method controlled, as seen from the figure, of the present utility model based on the FPGA collecting method controlled, and mainly comprises the steps that
S1: host computer passes to fpga chip by USB interface by under order, is stored in the order memory module of fpga chip, and described order memory module such as adopts two-port RAM to realize. Order includes action command and parameter command, and wherein, described parameter command includes 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 includes starting to gather and stop to gather.
The described order in command analysis module resolve command memory module in S2:FPGA chip, judges it is electromagnetic acoustic detection or Magnetic Flux Leakage Inspecting according to command analysis result,
If electromagnetic acoustic detects, then command analysis result being 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 arranged in described fpga chip. In an embodiment of the present utility model, electromagnetic ultrasonic signal cache module adopts SRAM or SDRAM to realize. Subsequently 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, and magnetic leakage signal cache module adopts asynchronous FIFO to realize, and asynchronous FIFO realizes writing fast reading slowly, and reading and writing are independent of each other. Subsequently enter step S4;
S3: described 2-1MUX module gating A input, described pulse generating module produces corresponding pumping signal according to the command analysis result received in step S2, described pumping signal for inspiring electromagnetic ultrasonic wave and then carrying out electromagnetic acoustic detection in object to be detected
Produce pumping signal start simultaneously at the electromagnetic ultrasonic signal being acquired carrying object defect information to be detected, it is 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
When terminating when once sampling, the electromagnetic ultrasonic signal carrying object defect information to be detected being 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
Start Deng sampling next time, repeat this step, until described fpga chip receives from ceasing and desisting order that described host computer sends, stop electromagnetic acoustic detection;
S4: described 2-1MUX module gating B input, the leakage field that described fpga chip receives gathers signal and is written into described magnetic leakage signal cache module,
When arriving the sampling depth set, the leakage field reading buffer memory from described magnetic leakage signal cache module gathers signal, through described 2-1MUX module transfer to described USB interface, then is uploaded in described host computer display and preserves,
While reading leakage field collection signal from described magnetic leakage signal cache module, new leakage field gathers data still in being ceaselessly written into 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 in this utility model embodiment based on the FPGA collecting method controlled, and wherein, solid arrow represents control signal, and hollow arrow represents digital signal. As seen from the figure, fpga chip includes pulse generating module, 2-1MUX module, electromagnetic ultrasonic signal cache module, magnetic leakage signal cache module, command analysis module and order memory module. The effect of host computer is to pass down order and storage collection data. The effect of USB interface is responsible for biography, uploading of electromagnetic acoustic data and the uploading of magnetic flux leakage data down of order. The effect of 2-1MUX module is when detecting for electromagnetic acoustic, is connected with USB interface 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. The effect of order memory module is the buffer memory order from host computer. The effect of command analysis module is that the order from host computer is resolved, and command analysis result is passed to corresponding module. The effect of magnetic leakage signal cache module is the leakage field entering fpga chip to be gathered signal temporarily store, and when reaching the sampling depth set, then is transferred to USB interface together and uploads in host computer. The effect of electromagnetic ultrasonic signal cache module is the electromagnetic acoustic sampled signal entering fpga chip temporarily to be stored, and when once sampling terminates, is transferred to USB interface and is uploaded in host computer. The effect of pulse generating module is to produce corresponding pulse excitation signal according to command analysis result.
Fig. 3 is the population structure schematic diagram in this utility model embodiment based on the FPGA data acquisition unit controlled. As seen from the figure, 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 are mainly included based on the FPGA data acquisition unit controlled.
Wherein, described fpga chip includes electromagnetic ultrasonic signal cache module, magnetic leakage signal cache module and pulse generating module. Described host computer is electrically connected by described USB interface and described fpga chip, below passes order and uploads data. The input of described D/A module is connected with the outfan of described pulse generating module, to convert pulse digital signal to analog signal output. The input of described Current amplifier module is connected with the outfan of described D/A module, so that the analogue signal that described D/A module is converted to is amplified to KV level by lying prostrate level, reload on described electromagnetic acoustic incentive probe, object to be detected produces electromagnetic ultrasonic wave. The input of described electromagnetic ultrasonic signal conditioning module is connected with the outfan of described electromagnetic acoustic receiving transducer, so that the induced voltage carrying object defect information to be detected produced on described electromagnetic acoustic receiving transducer to be nursed one's health. This electromagnetic ultrasonic signal conditioning module has the functions such as gain amplification, bandpass filtering. The input of described high-speed a/d module is connected with the outfan of described electromagnetic ultrasonic signal conditioning module, is converted to digital signal with the induced voltage after described electromagnetic ultrasonic signal conditioning module being nursed one's health. The input of described electromagnetic ultrasonic signal cache module is connected with the outfan of described high-speed a/d module, temporarily to store the digital signal that described high-speed a/d module is converted to. The input of described magnetic leakage signal conditioning module is connected with the outfan of described magnetic leakage probe, nurses one's health with the output voltage to described magnetic leakage probe. This magnetic leakage signal conditioning module has the function such as gain-adjusted, multi-center selection. The input of described low speed A/D module is connected with the outfan of described magnetic leakage signal conditioning module, digital signal is converted to the signal after described magnetic leakage signal conditioning module being nursed one's health, the input of described magnetic leakage signal cache module is connected with the outfan of described low speed A/D module, temporarily to store the digital signal that described low speed A/D module is converted to.
In an embodiment of the present utility model, it is-5V��+5V that the AD of described high-speed a/d module simulates input range, can accept bipolar signal input. It is 0V��+5V that the AD of described low speed A/D module simulates input range, can accept unipolar signal input.
In this utility model, induced voltage on electromagnetic acoustic receiving transducer is after electromagnetic ultrasonic signal conditioning module processes, being become digital signal to be exactly that electromagnetic acoustic gathers signal by high-speed a/d cell translation, this electromagnetic acoustic gathers signal and is transferred in fpga chip to carry out buffer memory and uploads. Magnetic ultrasound acquisition signal is carried out gain amplification and bandpass filtering by electromagnetic ultrasonic signal conditioning module. The signal of magnetic leakage probe is nursed one's health by magnetic leakage signal conditioning module, including 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 changes is exactly that leakage field gathers 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 utility model; not in order to limit this utility model; all any amendment, equivalent replacement and improvement etc. made within spirit of the present utility model and principle, should be included within protection domain of the present utility model.
Claims (3)
1. the data acquisition unit based on FPGA control, it is characterized in that, it is for carrying out the Non-Destructive Testing of steel pipe, it includes 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 includes electromagnetic ultrasonic signal cache module, magnetic leakage signal cache module and pulse generating module,
Described host computer is electrically connected by described USB interface and described fpga chip, below passes order and uploads data,
The input of described D/A module is connected with the outfan of described pulse generating module, to convert pulse digital signal to analog signal output,
The input of described Current amplifier module is connected with the outfan of described D/A module, so that the analogue signal that described D/A module is converted to is amplified to KV level by lying prostrate level, reload on described electromagnetic acoustic incentive probe, object to be detected produces electromagnetic ultrasonic wave
The input of described electromagnetic ultrasonic signal conditioning module is connected with the outfan of described electromagnetic acoustic receiving transducer, so that the induced voltage carrying object defect information to be detected produced on described electromagnetic acoustic receiving transducer is nursed one's health,
The input of described high-speed a/d module is connected with the outfan of described electromagnetic ultrasonic signal conditioning module, is converted to digital signal with the induced voltage after described electromagnetic ultrasonic signal conditioning module being nursed one's health,
The input of described electromagnetic ultrasonic signal cache module is connected with the outfan of described high-speed a/d module, temporarily to store the digital signal that described high-speed a/d module is converted to,
The input of described magnetic leakage signal conditioning module is connected with the outfan of described magnetic leakage probe, nurses one's health with the output voltage to described magnetic leakage probe,
The input of described low speed A/D module is connected with the outfan of described magnetic leakage signal conditioning module, is converted to digital signal with the signal after described magnetic leakage signal conditioning module being nursed one's health,
The input of described magnetic leakage signal cache module is connected with the outfan of described low speed A/D module, temporarily to store the digital signal that described low speed A/D module is converted to.
2. a kind of based on the FPGA data acquisition unit controlled as claimed in claim 1, it is characterised in that it is-5V��+5V that the AD of described high-speed a/d module simulates input range, can accept bipolar signal input.
3. a kind of based on the FPGA data acquisition unit controlled as claimed in claim 2, it is characterised in that it is 0V��+5V that the AD of described low speed A/D module simulates input range, can accept unipolar signal input.
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| CN201521100071.5U CN205281179U (en) | 2015-12-24 | 2015-12-24 | Data acquisition device based on FPGA control |
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| CN201521100071.5U CN205281179U (en) | 2015-12-24 | 2015-12-24 | Data acquisition device based on FPGA control |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425684A (en) * | 2015-12-24 | 2016-03-23 | 华中科技大学 | Data acquisition method and device based on FPGA control |
| CN112269340A (en) * | 2020-10-30 | 2021-01-26 | 四川迈迪测控技术有限公司 | Multi-signal type high-precision acquisition card |
| CN112881536A (en) * | 2019-11-29 | 2021-06-01 | 哈尔滨工业大学 | Large-scale high-speed rotation equipment ultrasonic signal high-speed acquisition system based on acquisition and transmission integration |
-
2015
- 2015-12-24 CN CN201521100071.5U patent/CN205281179U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425684A (en) * | 2015-12-24 | 2016-03-23 | 华中科技大学 | Data acquisition method and device based on FPGA control |
| CN105425684B (en) * | 2015-12-24 | 2017-10-31 | 华中科技大学 | A kind of collecting method and device controlled based on FPGA |
| CN112881536A (en) * | 2019-11-29 | 2021-06-01 | 哈尔滨工业大学 | Large-scale high-speed rotation equipment ultrasonic signal high-speed acquisition system based on acquisition and transmission integration |
| CN112269340A (en) * | 2020-10-30 | 2021-01-26 | 四川迈迪测控技术有限公司 | Multi-signal type high-precision acquisition card |
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