CN107884473A - A kind of multi frequency detection system - Google Patents
A kind of multi frequency detection system Download PDFInfo
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- CN107884473A CN107884473A CN201711017884.1A CN201711017884A CN107884473A CN 107884473 A CN107884473 A CN 107884473A CN 201711017884 A CN201711017884 A CN 201711017884A CN 107884473 A CN107884473 A CN 107884473A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals
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Abstract
The embodiment of the invention discloses a kind of multi frequency detection system, it is characterised in that including：Multiple-frequency signal generation module, for producing pumping signal, coil is set to produce excitation field；Measurement module, for gathering the data to model detection；Data processing module, for reading the data of the measurement module collection, and analyze and extract amplitude information.It can be realized using this system and model defect is carried out to continue observation, and high sensitivity, speed are fast and applicable situation is wide.
Description
Technical field
The present embodiments relate to non-destructive testing technology, more particularly to a kind of multi frequency detection system.
Background technology
With industrial boom, the manufacturing industry such as automobile, aircraft be also rapid development, wherein, axle class, pressure vessel with
And the parts of aircraft are usually to be manufactured with various hardwares, these metal materials, can be due to squeezing when working long hours
Pressure, collide and deform, fracture, crackle, bubble etc. easily occur, if being updated without repairing, can cause serious injury, even
Entail dangers to life security.Therefore, non-destructive testing technology is just particularly important.
At present, the detection of defect has many methods, such as infrared detection.X-ray detection, ultrasound detection etc., wherein, ultrasound
The detection of ripple ripple is a kind of method of relatively accreditation, and its operation principle is the propagation characteristic in test specimen based on ultrasonic wave.Sound source is produced
Raw ultrasonic wave, makes ultrasonic wave enter test specimen by the way of certain；Ultrasonic wave propagated in test specimen and with material for test and its
The defects of interaction, be changed its direction of propagation or feature；Ultrasonic wave after change is received by detection device, and
It can be counted and be handled and analyzed；According to the Ultrasonic characteristics of reception, assess test specimen in itself and its inside whether there is defect
Characteristic.
Some defects be present in existing Ultrasonic Nondestructive technology：Be not suitable for persistently observing the change applicable situation of defect
It is limited.
The content of the invention
The embodiment of the present invention provides a kind of multi frequency detection system, can realize and model defect is carried out to continue observation,
And high sensitivity, speed are fast and applicable situation is wide.
The embodiments of the invention provide a kind of multi frequency detection system, it is characterised in that including：
Multiple-frequency signal generation module, for producing pumping signal, coil is set to produce excitation field；
Measurement module, for gathering the data to model detection；
Data processing module, for reading the data of the measurement module collection, and analyze and extract amplitude information.
In above-mentioned technical proposal, it is preferred that the multiple-frequency signal generation module includes multiple-frequency signal source, more for producing
Frequency signal.
In above-mentioned technical proposal, it is preferred that the multiple-frequency signal generation module also includes：Amplifier and current source；
The amplifier is used for the amplification to multiple-frequency signal；
The current source is used to voltage drive being converted into current excitation.
In above-mentioned technical proposal, it is preferred that the current source is constant-current source.
In above-mentioned technical proposal, it is preferred that the measurement module includes：Scanning system and probe；
The scanning system includes magnetoresistive transducer, for measuring magnetic direction and size, exports the magnetic field of three-dimensional
Intensity；
The probe includes magnet exciting coil and AMR sensor structure, for improving spatial resolution.
In above-mentioned technical proposal, it is preferred that the probe also includes:Gather plate module；
The collection plate module magnetoresistive transducer resets module and detection signal amplification module；
The detection signal amplification module is used to be amplified the voltage signal of magnetoresistive chip output.
In above-mentioned technical proposal, it is preferred that the data processing module utilizes STM32 chip microcontrollers.
The embodiment of the present invention constitutes a kind of multifrequency by multiple-frequency signal generation module, measurement module with data processing module
Eddy detection system, it can realize and to model defect continue observation, and high sensitivity, speed is fast and applicable situation
Extensively.
Brief description of the drawings
Fig. 1 is the structured flowchart of the multi frequency detection system in the embodiment of the present invention；
Fig. 2 is the signal flow graph of the multi frequency detection in the embodiment of the present invention.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that in order to just
Part related to the present invention rather than entire infrastructure are illustrate only in description, accompanying drawing.
Fig. 1 is the structured flowchart of the multi frequency detection system in the embodiment of the present invention, and this multi frequency detection system is more
Including multiple-frequency signal generation module, for producing pumping signal, coil is set to produce excitation field；Measurement module, for collection pair
The data of model detection；Data processing module, for reading the data of the measurement module collection, and analyze and extract amplitude letter
Breath..
Wherein, the multiple-frequency signal generation module includes multiple-frequency signal source, amplifier and current source.The multiple-frequency signal source
For producing the excitation signal of multiple frequencies, suppress several interference signals, and then isolate required signal.Usual multifrequency letter
Number general very little of multiple-frequency signal caused by source is, it is necessary to utilize amplification of the amplifier to multiple-frequency signal.The current source, preferably
Be constant-current source, for voltage drive caused by signal generator to be converted into current excitation, excitation field is produced with this.
The measurement module includes magnet exciting coil, AMR sensor structure and collection plate module.Wherein described magnet exciting coil
The sensitivity and measurement range of shape, size, position to magnetoresistive transducer have a significant impact, and the present invention uses square coil.Institute
Stating AMR sensor structure is based on the basis of thin film magneto element, plus the composition such as periphery and circuit.Mainly include：
1) wheatstone bridge configuration, electric bridge output is difference form；
2) resistance device of Wheatstone bridge is the film resistor for being mounted with BARBER electrodes；
3) set/reset current strap is set, and bias current is used for the compensating action of current strap.
The collection plate module includes magnetoresistive transducer and resets module and detection signal amplification module, wherein the magnetic resistance passes
Sensor resets module and realized preferably through reset circuit.The detection signal amplification module is used for magnetoresistive chip output
Voltage signal is amplified.
The scanning system includes magnetoresistive transducer, preferably utilizes HMC1043 sensors, and it is a kind of low-intensity magnetic field sensing
Device, the fields such as orientation, navigation, magnetic-field measurement and current sense are widely used in, its internal basic structure is Wheatstone bridge, energy
Enough magnetic field intensities to three axles are sensitive, operation principle be the magnetic field intensity perpendicular to measurement axle of incidence is converted into it is differential
Output voltage.
The data processing module preferably realizes that the STM32 is using in Cortex-M3 using STM32 development boards
Core, possess stronger performance.The main input capture function of using chip of the invention and AD conversion function.The AD of the STM32
Conversion is the converter of the Approach by inchmeal of a kind of 12, has multiple AD conversion patterns, such as single conversion or continuous conversion.Pass through
Left-justify and Right Aligns mode of the control register to ADC are controlled.The present invention need to produce a PWM ripple to magneto-resistive transducing
Device, when rising edge, magnetoresistive transducer is set, and now Magnetic Field is just effective, and one is captured by STM32 capturing function
An interrupt requests are produced during rising edge, and then realize AD conversion.
Fig. 2 is the signal flow graph of the multi frequency detection in the embodiment of the present invention, first by multi-frequency signal generator
Multiple-frequency signal R1 (t) needed for producing gives magnet exciting coil, because by model parameter, (including electrical conductivity, magnetic conductivity, size are big
Small, temperature etc.) influence, the response signal R2 (t) of probe contains the modulated signal that the material elements of model influences.R2(t)
Signal set is sent into filtering and wave detector according to respective frequency spectrum.In figure, R3 (t) is one group that multi-frequency signal generator provides
Reference signal gives the circuit of quadrature detection.The signal exported by wave detector is the parameter information of model, signal collection Wl signals
Collect to be the signal set after being pre-processed to model parameter information.It may be noted that General System signal is to response signal
Change can make corresponding change.Wherein, Q signal collection is that the conversion of W1 signal collection is analyzed to obtain according to mathematical formulae.Multifrequency
Each sense channel of electric lossless detection method is all the result of all combined factors effects of model, if there is m factor shadow
Ring, then need m separation that each Air conduct measurement is come out.
Pay attention to, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although being carried out by above example to the present invention
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
Other more equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (7)
- A kind of 1. multi frequency detection system, it is characterised in that including：Multiple-frequency signal generation module, for producing pumping signal, coil is set to produce excitation field；Measurement module, for gathering the data to model detection；Data processing module, for reading the data of the measurement module collection, and analyze and extract amplitude information.
- 2. multi frequency detection system according to claim 1, it is characterised in that the multiple-frequency signal generation module includes Multiple-frequency signal source, for producing multiple-frequency signal.
- 3. multi frequency detection system according to claim 2, it is characterised in that the multiple-frequency signal generation module also wraps Include：Amplifier and current source；The amplifier is used for the amplification to multiple-frequency signal；The current source is used to voltage drive being converted into current excitation.
- 4. multi frequency detection system according to claim 3, it is characterised in that the current source is constant-current source.
- 5. multi frequency detection system according to claim 1, it is characterised in that the measurement module includes：Scanning system System and probe；The scanning system includes magnetoresistive transducer, for measuring magnetic direction and size, exports the magnetic field intensity of three-dimensional；The probe includes magnet exciting coil and AMR sensor structure, for improving spatial resolution.
- 6. multi frequency detection system according to claim 5, it is characterised in that the probe also includes:Gather template die Block；The collection plate module magnetoresistive transducer resets module and detection signal amplification module；The detection signal amplification module is used to be amplified the voltage signal of magnetoresistive chip output.
- 7. multi frequency detection system according to claim 1, it is characterised in that the data processing module utilizes STM32 chip microcontrollers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711017884.1A CN107884473A (en) | 2017-10-26 | 2017-10-26 | A kind of multi frequency detection system |
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| CN201711017884.1A CN107884473A (en) | 2017-10-26 | 2017-10-26 | A kind of multi frequency detection system |
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| CN107884473A true CN107884473A (en) | 2018-04-06 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444255A (en) * | 2018-09-06 | 2019-03-08 | 昆明理工大学 | A kind of diagnostic method of carbon fibre reinforced composite defect |
| CN113092577A (en) * | 2021-03-24 | 2021-07-09 | 南京航空航天大学 | Track defect detection system based on multi-frequency excitation eddy current and detection method thereof |
| CN116068044A (en) * | 2023-03-21 | 2023-05-05 | 辽宁锂想科技有限公司 | Multichannel multi-frequency weld joint flaw detection device |
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| JPS62255862A (en) * | 1986-04-28 | 1987-11-07 | Furukawa Electric Co Ltd:The | Multi-frequency type eddy current flaw detector |
| CN1299053A (en) * | 2000-12-08 | 2001-06-13 | 宝山钢铁股份有限公司 | Multi-frequency multi-channel roller eddy detecting instrument |
| CN103852000A (en) * | 2014-03-24 | 2014-06-11 | 电子科技大学 | Method and device for detecting thickness of multi-layer conductive coating through vortex |
| CN106645391A (en) * | 2016-10-10 | 2017-05-10 | 南京航空航天大学 | Multi-frequency eddy current testing system and method for evaluating carbon fiber plate defect depth |
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2017
- 2017-10-26 CN CN201711017884.1A patent/CN107884473A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62255862A (en) * | 1986-04-28 | 1987-11-07 | Furukawa Electric Co Ltd:The | Multi-frequency type eddy current flaw detector |
| CN1299053A (en) * | 2000-12-08 | 2001-06-13 | 宝山钢铁股份有限公司 | Multi-frequency multi-channel roller eddy detecting instrument |
| CN103852000A (en) * | 2014-03-24 | 2014-06-11 | 电子科技大学 | Method and device for detecting thickness of multi-layer conductive coating through vortex |
| CN106645391A (en) * | 2016-10-10 | 2017-05-10 | 南京航空航天大学 | Multi-frequency eddy current testing system and method for evaluating carbon fiber plate defect depth |
Non-Patent Citations (1)
| Title |
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| 刘建旭: "多频涡流检测系统的设计", 《万方学位论文数据库》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444255A (en) * | 2018-09-06 | 2019-03-08 | 昆明理工大学 | A kind of diagnostic method of carbon fibre reinforced composite defect |
| CN113092577A (en) * | 2021-03-24 | 2021-07-09 | 南京航空航天大学 | Track defect detection system based on multi-frequency excitation eddy current and detection method thereof |
| CN116068044A (en) * | 2023-03-21 | 2023-05-05 | 辽宁锂想科技有限公司 | Multichannel multi-frequency weld joint flaw detection device |
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