CN101813655B - 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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- CN101813655B CN101813655B CN2010101537114A CN201010153711A CN101813655B CN 101813655 B CN101813655 B CN 101813655B CN 2010101537114 A CN2010101537114 A CN 2010101537114A CN 201010153711 A CN201010153711 A CN 201010153711A CN 101813655 B CN101813655 B CN 101813655B
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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 new material of this but also antifatigue and corrosion not only lighter solid than aluminium of increasing use 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.) provide the application of method in the test of CFRP respectively based on ultrasonic technique (acoustic emission), 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, M Salvia gradually; 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 fibre 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 deficiency of prior art; A kind of noncontact, harmless measurement mechanism and method to carbon fiber reinforced plastics (CFRP) are provided; With the problem of mentioning more than solving, the present invention utilizes the extremely strong electromagnetic sensor of a kind of directivity of particular design.
The objective of the invention is to realize 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 up 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 through power amplifier, and receives the signal by the receiving coil induction through 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 accomplishing 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 fibre bearing of trend of carbon fiber reinforced plastics.
Apparatus and method of the present invention can access the bearing of trend of carbon fibre, and then judge whether it twists, ruptures.In aircraft industry, at present, for the carbon fibre 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 get into 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 fibre 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.
The practical implementation method
With implementing the present invention is done further detailed description below in conjunction with accompanying drawing.
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 as the two magnetic core coil sensors that encourage and receive respectively and perhaps place top on the carbon fiber reinforced plastic sheet 7 near the CFRP plate; Fixing 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 fixing two magnetic core coils make carbon fiber reinforced plastic sheet rotate according to 5 ° of modes that increase progressively, and by host computer control drive coil 5 are applied pumping signal in each angle, gather the induced signal on the receiving coil 6.
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 fibre 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, through 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 fixing 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 accomplishing 360 ° of rotations;
Host computer finds to produce peaked angle according to the signal that collects, and this angle is the carbon fibre 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 up of coiling on flat magnetic core, is axis with the magnetic core, and coiling parallels with axis; Host computer links to each other with drive coil through power amplifier, and receives the signal by the receiving coil induction through 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) 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 accomplishing 360 ° of rotations;
4) after handling, induced signal process signal condition that collects and collecting unit send into host computer; Host computer is according to the signal that collects; Find the peaked angle of induced signal, this angle direction straight line is the carbon fibre 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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| JP6069162B2 (en) * | 2013-10-11 | 2017-02-01 | 株式会社Ihi | Fiber meandering detection method and fiber meandering detection device for conductive composite material |
| CZ2014742A3 (en) * | 2014-11-03 | 2016-04-20 | Vysoké Učení Technické V Brně | Method of evaluating degradation, density and orientation of ferromagnetic electrically conducting fibers within composite material and detection device for making the same |
| 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 |
| 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 |
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| US5512821A (en) * | 1991-06-04 | 1996-04-30 | Nkk Corporation | Method and apparatus for magnetically detecting defects in an object with compensation for magnetic field shift by means of a compensating coil |
| JP4451111B2 (en) * | 2003-10-20 | 2010-04-14 | 株式会社荏原製作所 | Eddy current sensor |
| US8058865B2 (en) * | 2005-08-30 | 2011-11-15 | Nctengineering Gmbh | Sensor device, sensor arrangement, and method of measuring a property of an object |
| CN101341424B (en) * | 2005-12-22 | 2012-07-18 | 皇家飞利浦电子股份有限公司 | Magnetic induction tomography system and method |
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