CN101813655A - Device and method for measuring carbon fiber reinforced plastic based on electromagnetic sensing - Google Patents
Device and method for measuring carbon fiber reinforced plastic based on electromagnetic sensing Download PDFInfo
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- CN101813655A CN101813655A CN 201010153711 CN201010153711A CN101813655A CN 101813655 A CN101813655 A CN 101813655A CN 201010153711 CN201010153711 CN 201010153711 CN 201010153711 A CN201010153711 A CN 201010153711A CN 101813655 A CN101813655 A CN 101813655A
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Abstract
The invention relates to the technical field of non-destructive testing of carbon fiber reinforced plastic (CFRP), in particular to a device for measuring carbon fiber reinforced plastic based on electromagnetic sensing, which comprises an exciting coil, a receiving coil, a signal conditioning and acquisition unit, a power amplifier and a host computer. The exciting coil and the receiving coil formed by winding a wire around a flat magnetic core are both arranged on a carbon fiber reinforced plastic board and are rotated with angles increasing, and an excitation signal is exerted on the exciting coil at each angle so as to collect a sensing signal on the receiving coil; and the host computer is used for processing signals according to the collected signal, so as to find out a carbon fiber extension direction for the carbon fiber reinforced plastic. The invention simultaneously provides a measuring method adopted by the device. Moreover, the invention can rapidly test the carbon fiber reinforced plastic CFRP in a non-contact way under the condition of being non-contact, and has great significance in the testing of aerospace materials.
Description
Technical field
The present invention relates to and belongs to carbon fiber reinforced plastics non-destructive testing technical field, relates to a kind of based on electromagnetic sensing measurement carbon fiber reinforced plastics system.
Background technology
Carbon fiber reinforced plastics (CFRP) is a kind of advanced composite material (ACM).Especially the increasing new material that uses this but also antifatigue and corrosion not only lighter solid than aluminium on military aircraft is made can make that like this aircraft is lighter and flexible, saves fuel oil simultaneously.Also progressively this material of use more and more on novel civil aircraft.Therefore in aircraft industry, can develop a kind of technology that carbon fiber reinforced plastics is carried out nondestructive evaluation is urgent and urgent need.C.Boller (C.Boller, R Dilger, In flight aircraft structure health monitoring basedon smart structures technology, AGARD Conf.Proc.CP 531Smart Structures for Aircraftand Spacecraft.pp.17,1993.), R M Measures (R M Measures, Fibre optic sensing forcomposite smart structures AGARD Conf.Proc.CP531, Smart Structures for Aircraftand Spacecraft (AGARD) .1993) and V.Stephen (V.Stephen, S.Kharkovsky, J.Nadakuduti, R.Zoughi, Microwave field measurement of delaminations in CFRP concrete members ina bridge, Source unknown.) provides respectively based on ultrasonic technique (acoustic emission), the application of method in the test of CFRP of optical fiber technology (optical fiber) and microwave technology microwave techniques, measure based on contact method material AC and DC conductive characteristic and the method that CFRP assesses is also begun to occur (0Ceysson gradually, M Salvia, L Vincent, Damage mechanisms characterization of carbonfiber/epoxy laminates by both electrical measurements and acoustic emission analysis.Scripta Materialia, Vol.34pp1273-80,1996.).In the research of having reported, thereby adopt electrochemical plating that carbon fiber exposed portions serve plating skim copper film is carried out the measurement of conductance to the CFRP workpiece.But these method major parts need contact type measurement, use more loaded down with trivial details, be not suitable for that aircraft industry is badly in need of fast, on-the-spot test.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of noncontact, harmless measurement mechanism and method to carbon fiber reinforced plastics (CFRP) are provided, to solve above-mentioned problem, the present invention utilizes the extremely strong electromagnetic sensor of a kind of directivity of particular design.
The object of the present invention is achieved like this:
A kind of device of measuring carbon fiber reinforced plastics based on electromagnetic sensing, comprise sensor, signal condition and collecting unit, power amplifier and host computer, described sensor comprises drive coil and the receiving coil that is made of coiling on flat magnetic core, with the magnetic core is axis, and coiling parallels with axis; Host computer links to each other with drive coil by power amplifier, and receives the signal of being responded to by receiving coil by signal condition and collecting unit; Drive coil and receiving coil are parallel to each other according to direction of winding, and the position relation that axis is linked to be straight line is placed on the carbon fiber reinforced plastic sheet to be detected; The phase mutual edge distance of two coils is certain, and the spatial relation for rotating between straight line that is linked to be by axis and the carbon fiber reinforced plastic sheet to be detected.
As preferred implementation, winding the line is that insulated conductor, its diameter are 0.1mm-10mm, and the number of turn of coiling is the 1-10 circle; The length of magnetic core is 5-10mm, and width is 1-2mm, highly is 5-10mm, and material is high magnetic conduction substance.
The present invention provides a kind of carbon fiber reinforced plastics measuring method that adopts described measurement mechanism to realize simultaneously, comprises the following steps:
1) drive coil and receiving coil is parallel to each other according to direction of winding and axis is linked to be straight line position relation are placed on the carbon fiber reinforced plastic sheet, angle of secure alignment that axis is linked to be, drive coil is applied pumping signal, gather the signal of receiving coil induction;
2) straight line that under the certain situation of two coil phase mutual edge distances of maintenance two coil axis is linked to be rotates according to the mode that angle increases progressively, carbon fiber reinforced plastic sheet is rotated according to the mode that angle increases progressively, whenever increase progressively a new angle, drive coil is applied pumping signal, gather the induced signal on the receiving coil;
3) repeating step 2, until finishing 360 ° of rotations;
4) send into host computer after induced signal process signal condition that collects and collecting unit are handled, computing machine finds the peaked angle of induced signal according to the signal that collects, and this angle direction straight line is the carbon fiber bearing of trend of carbon fiber reinforced plastics.
Apparatus and method of the present invention can access the bearing of trend of carbon fiber, and then judge whether it twists, ruptures.In aircraft industry, at present, for the carbon fiber bearing of trend of fibre reinforced plastics and whether twist, rupturing does not have effective non-cpntact measurement means.Because the comparatively conduction of fibre reinforced plastics, so microwave promptly is reflected on the surface, microwave can't enter its inside.And ultrasonic technique needs closely to contact with fibre reinforced plastics, also is unfavorable for on-the-spot test.And adopt electromagnetic sensing to measure carbon fiber reinforced plastics, under non-contact situation, can access the carbon fiber bearing of trend of fibre reinforced plastics and whether twist, breaking state, the reliability of aircraft and parts thereof, the assessment of integrality are had very big realistic meaning.
Description of drawings
Fig. 1 measurement mechanism schematic diagram of measuring carbon fiber reinforced plastics based on electromagnetic sensing of the present invention;
Fig. 2 magnetic core coil sensor synoptic diagram;
Fig. 3 single coil synoptic diagram.
Specific implementation method
Below in conjunction with accompanying drawing and enforcement the present invention is further described.
Referring to Fig. 1 and Fig. 2, measurement mechanism of the present invention comprises two magnetic core coil sensors, signal condition and collecting unit, power amplifier and the host computer of drive coil 5 and receiving coil 6.
Be placed on the carbon fiber reinforced plastic sheet 7 as excitation and the two magnetic core coil sensors that receive respectively or place top near the CFRP plate, fix an angle, under the constant situation of distance between two magnetic core coils of maintenance, rotate two coils according to 5 ° of modes that increase progressively; Perhaps fix two magnetic core coils, carbon fiber reinforced plastic sheet is rotated according to 5 ° of modes that increase progressively, by host computer control drive coil 5 is applied pumping signal, gather the induced signal on the receiving coil 6 in each angle.
Be admitted to host computer behind induced signal process signal condition that receiving coil receives and the collecting unit, according to the signal that collects, signal handled, can find the carbon fiber bearing of trend of carbon fiber reinforced plastics by host computer.
Signal generating unit adopts synthetic (DDS) chip AD7008 of Direct Digital, and this chip can produce the sinusoidal excitation signal of different amplitudes and phase place.The amplitude of pumping signal and phase place can be by computer installations, by being added on the drive coil after the power amplifier amplification.
Fig. 3 is the single coil structural representation.Drive coil and receiving coil wind the line on flat magnetic core and form.With the magnetic core is axis, and it is parallel with axis to wind the line.During use, make the axis of two coils in alignment, be placed on carbon fiber reinforced plastic sheet to be detected 7.Coiling is insulated conductor, and its diameter is 0.1mm-10mm, and the number of turn of coiling is the 1-10 circle; The length of magnetic core is 5-10mm, and width is 1-2mm, highly is 5-10mm, and material is high magnetic conduction substance, for example ferrite.With the magnetic core is axis, and coiling is parallel to each other with axis.This structure of sensor makes it have extremely strong directivity.Among the figure, 1 is flat magnetic core, and 2 is coil-winding, and 3,4 draw joint for coil.
Using this device measures specifically carbon fiber reinforced plastics and may further comprise the steps:
1) drive coil and receiving coil are placed on the carbon fiber reinforced plastic sheet, fix an angle.Drive coil is applied pumping signal, gather the induced signal on the receiving coil;
2) rotate carbon fiber reinforced plastic sheet (also can fixed carbon compo plate, rotate two coils) according to 5 ° of modes that increase progressively, the angle new applies pumping signal to drive coil, gathers the induced signal on the receiving coil;
3) repeating step 2, until finishing 360 ° of rotations;
Host computer finds to produce peaked angle according to the signal that collects, and this angle is the carbon fiber bearing of trend of carbon fiber reinforced plastics.
Claims (3)
1. device of measuring carbon fiber reinforced plastics based on electromagnetic sensing, comprise sensor, signal condition and collecting unit, power amplifier and host computer, it is characterized in that, described sensor comprises drive coil and the receiving coil that is made of coiling on flat magnetic core, with the magnetic core is axis, and coiling parallels with axis; Host computer links to each other with drive coil by power amplifier, and receives the signal of being responded to by receiving coil by signal condition and collecting unit; Drive coil and receiving coil are parallel to each other according to direction of winding, and the position relation that axis is linked to be straight line is placed on the carbon fiber reinforced plastic sheet to be detected; The phase mutual edge distance of two coils is certain, and the spatial relation for rotating between straight line that is linked to be by axis and the carbon fiber reinforced plastic sheet to be detected.
2. according to claim 1ly measure carbon fiber reinforced plastics (CFRP) device based on electromagnetic sensing, it is characterized in that winding the line is that insulated conductor, its diameter are 0.1mm-10mm, the number of turn of coiling is the 1-10 circle; The length of magnetic core is 5-10mm, and width is 1-2mm, highly is 5-10mm, and material is high magnetic conduction substance.
3. a carbon fiber reinforced plastics measuring method that adopts the described measurement mechanism of claim 1 to realize is characterized in that, comprises the following steps:
1. drive coil and receiving coil is parallel to each other according to direction of winding and axis is linked to be straight line position relation are placed on the carbon fiber reinforced plastic sheet, angle of secure alignment that axis is linked to be, drive coil is applied pumping signal, gather the signal of receiving coil induction;
2. the straight line that under the certain situation of two coil phase mutual edge distances of maintenance two coil axis is linked to be rotates according to the mode that angle increases progressively, carbon fiber reinforced plastic sheet is rotated according to the mode that angle increases progressively, whenever increase progressively a new angle, drive coil is applied pumping signal, gather the induced signal on the receiving coil;
3. repeating step 2, until finishing 360 ° of rotations;
4. send into host computer after induced signal process signal condition that collects and collecting unit are handled, computing machine finds the peaked angle of induced signal according to the signal that collects, and this angle direction straight line is the carbon fiber bearing of trend of carbon fiber reinforced plastics.
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| CN2010101537114A CN101813655B (en) | 2010-04-23 | 2010-04-23 | Device and method for measuring carbon fiber reinforced plastic based on electromagnetic sensing |
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| CN2010101537114A CN101813655B (en) | 2010-04-23 | 2010-04-23 | Device and method for measuring carbon fiber reinforced plastic based on electromagnetic sensing |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015052956A1 (en) * | 2013-10-11 | 2015-04-16 | 株式会社Ihi | Fiber undulation detection method for conductive composite material and fiber undulation detection device |
| CN104897774A (en) * | 2015-05-13 | 2015-09-09 | 南京航空航天大学 | Eddy current microscopic construction imaging method of carbon fiber composite material |
| CN104897775A (en) * | 2015-05-13 | 2015-09-09 | 南京航空航天大学 | Test system for intermediate frequency eddy current of carbon fiber resin matrix composite |
| CN107110821A (en) * | 2014-11-03 | 2017-08-29 | 高新技术学习公司 | For assessing the distribution in the composite of ferromagnetic conductive fiber, density and the method and detection device of orientation |
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Cited By (10)
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| WO2015052956A1 (en) * | 2013-10-11 | 2015-04-16 | 株式会社Ihi | Fiber undulation detection method for conductive composite material and fiber undulation detection device |
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| US10132778B2 (en) | 2013-10-11 | 2018-11-20 | Ihi Corporation | Fiber waviness detection method and apparatus for conductive composite materials |
| CN107110821A (en) * | 2014-11-03 | 2017-08-29 | 高新技术学习公司 | For assessing the distribution in the composite of ferromagnetic conductive fiber, density and the method and detection device of orientation |
| CN107110821B (en) * | 2014-11-03 | 2021-03-09 | 高新技术学习公司 | Method and detection device for evaluating distribution, density and orientation of ferromagnetic conductive fibers in a composite material |
| CN104897774A (en) * | 2015-05-13 | 2015-09-09 | 南京航空航天大学 | Eddy current microscopic construction imaging method of carbon fiber composite material |
| CN104897775A (en) * | 2015-05-13 | 2015-09-09 | 南京航空航天大学 | Test system for intermediate frequency eddy current of carbon fiber resin matrix composite |
| CN104897774B (en) * | 2015-05-13 | 2018-11-09 | 南京航空航天大学 | A kind of current vortex of carbon fibre composite carefully sees structure imaging method |
| CN104897775B (en) * | 2015-05-13 | 2018-12-11 | 南京航空航天大学 | A kind of carbon fiber resin matrix composite intermediate-frequency vortex detection system |
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