CN101614677A - The high-precision laser holographic automatic detection system of wing-splint honeycomb structure - Google Patents
The high-precision laser holographic automatic detection system of wing-splint honeycomb structure Download PDFInfo
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- CN101614677A CN101614677A CN200810012014A CN200810012014A CN101614677A CN 101614677 A CN101614677 A CN 101614677A CN 200810012014 A CN200810012014 A CN 200810012014A CN 200810012014 A CN200810012014 A CN 200810012014A CN 101614677 A CN101614677 A CN 101614677A
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Abstract
The high-precision laser holographic automatic detection system of wing-splint honeycomb structure, its characteristics are: the acoustic transducer in a broadband is fixed on the detected material epidermis, and, epidermis is applied vibration force with the parts that 250 conspicuous ultrasound waves excite 0.120cm and 0.120cm to splice; By laser hologram photography,, obtain one group of difference interference fringe with time method of average picked-up holographic information, again by the laser video picture, with the interference fringe imaging, and image-forming information imported computing machine, can on computer monitor, know and see defective locations shape, the degree of depth and size.The invention has the advantages that the measuring accuracy height, do not measure the dead angle, improved the security of products energy.
Description
Technical field
The invention belongs to a kind of laser hologram detection technique field.
Background technology
The inspection of wing honeycomb at present is to adopt sampling Detection or ultrasound examination, adopt above-mentioned inspection method that tiny flaw is omitted easily, when not detecting when having defective in the wing-splint honeycomb structure, aircraft safety is stayed hidden danger, can cause tremendous economic loss and casualties in case accidents happened.
Summary of the invention
The purpose of this invention is to provide a kind of laser holographic automatic detection system splint honeycomb structure is checked, the wing-splint honeycomb structure three-dimensional image can be presented on the computer screen, by the MICROCOMPUTER PROCESSING printout.
Adopt the Holographic Interferometry technology, can check simple or complicated splint honeycomb structure and the plate that splices, can know on inspection that epidermis is following and throw off (the lining heart and epidermis, epidermis and epidermis, nest and nest, epidermis and member), the disengaging of splicing, be mingled with, bond not firm, serve as a contrast defective such as heart damage.When checking, can be as the case may be, adopt diverse ways, on sample, apply slight power and (comprise that heating, pressure change, vacuumize and acoustic vibration etc.), as long as the adequate measures of taking make specimen surface that 2 microns displacement take place, be reacted to the surface with regard to the defective that is enough to make sample inside and come up.Adopt re-expose method or real-time monitored method, suddenly discontinuous variation takes place in the shape and the spacing of observing the interference fringe on surface, just can determine position, kind, size and the degree of depth of sample inherent vice.
The equipment that the present invention adopts comprises a cover laser hologram gamma camera and computing machine, printer.
One, acoustic vibration method
When flaw detection, the acoustic transducer of a wide wavestrip is fixed on the epidermis of sample, according to the thickness of material and the position of defective, the vibration that is applied can be shear wave, compressional wave, surface wave, carry out holograph therebetween in the sample vibration, makes sensitization version development mutually then.
In defective place, because the epidermis combination is very loosening or can carry out free vibration fully, so its amplitude is just big than other area.Like this, when captured hologram being built picture, just can see the interference fringe of one group of difference, the surface profile in loosening zone is delineated out.Can only measure the least displacement on vibrating object surface in the past with the acoustic vibration method, have only a hundreds of dust.The way that the position phase or the frequency of the reference beam in the holographic system are modulated in employing, make all each points of not doing to vibrate on the body surface be redeveloped into a details in a play not acted out on stage, but told through dialogues, and be redeveloped into a bright field not resembling usually, thereby can improve measurement sensitivity widely.
1, the position of reference beam is modulated mutually.With the time method of average picked-up hologram time (at object vibration time carry out the exposure of long period), can realize modulation by an oscillating mirror to reference beam position phase.The vibration frequency of catoptron is identical with the vibration frequency of object.Like this, just build as the time interference fringe seen the center of intensity distributions field, be displaced to J
0 2The place at first zero point (x).Through after this modulation, the displacement of object just looks like around this point, and no longer around the null displacement point.Like this, the each point that body surface is not done to vibrate becomes details in a play not acted out on stage, but told through dialogues when hologram reconstructing, thereby improves the sensitivity of body surface displacement measurement.If use reference beam is carried out the position way of modulation mutually, can write down surface vibration, and can once note surface vibration less than 50 dusts.When we excite one 0.120 centimetre during with 0.120 centimetre of parts that splice with 250 kilo hertzs ultrasound wave, surface displacement is the 50 Izod right sides only, hologram with time method of average shooting, a bit can't see vibrational image, after adopting the reference beam phasing technique, the hologram of shooting can be seen the standing wave pattern picture that ultrasonic transducer emits.The standing wave pattern that 1.27 centimetres of three diameters appear in also see simultaneously splice at the interface shows these three local appearance to disconnect as saltation zone.
2, to the frequency modulation (PFM) of reference beam.Reference beam is carried out frequency modulation (PFM), is to make reference beam by one the ultrasonic tank that passes through be arranged.A kind of Doppler will be taken place and move during by ultrasonic tank in reference beam, and when the frequency of ultrasonic frequency and object vibration was identical, the intensity field of interference fringe was pressed J
1 2(x) [the J of function distribution
1(x) be first order Bessel's function].Reference beam frequency modulation be can be used for vibration frequency more than 1 megahertz.
Employing is carried out phase modulation to reference beam, and the minimum amplitude that frequency modulation detects can reach 10
-7-10
-8Centimetre the order of magnitude.
Two, heating
Heating is the surface to detected sample, applies a hurried thermal pulse suitable with temperature.As strafing with a lamp surperficial several seconds of desire check, this can make sample produce every cun striped more than 10.When object cooled down, the profile of defective just clearly revealed.Use the thermal stress method, can check in 4 minutes that area of light is one square inch a cellular board,, then check comparatively effective with heating as viscose glue and aluminium.
As adopt modulator bulk wave method to control distance between the interference fringe, used optical element, as shown in Figure 4.Catoptron among Fig. 4 can tilt, and it can rotate around its horizontal axis.Its checked operation process is as follows: the hologram of shot object sections temperature state at first, and through developing, after the photographic fixing, putting back to the origin-location, so that carry out real-time monitored.To the object heating, at this moment resulting interference fringe is very close then, is difficult for the prompting defective.At this moment, rotate catoptron, the center that makes the interference fringe system up or down or forward, move backward.Then, along the optical axis mobile lens of lens, to increase the spacing of striped.So just can between object is still uncolled, detect the existence of defective.This improvement technology can be observed after temperature raises at once, and this not only improves inspection speed, and can disclose the maximum detail about the integrality of parts.
The invention has the advantages that the measuring accuracy height, do not measure the dead angle, improved the security of products energy.
Description of drawings
Fig. 1 is the block diagram of a kind of embodiment of the present invention.Wherein: label 17 is a holoscope; Label 18 is a computing machine; Label 19 is a printer.
Fig. 2 is the splint honeycomb structure synoptic diagram.Wherein: label 1,3 is the aluminium epidermis; Label 4,5 is the lining heart; Label 6 is the cellular board finished product.
Fig. 3 is for to carry out frequency modulation (PFM) optics system schematic to reference beam.Wherein: label 2 is an adhesive fabric; Label 7 is ultrasonic tank; Label 8 is a reference beam; Label 9 is a hologram; Label 10 is the object in the vibration; Label 11 is irradiation.
Fig. 4 is a modulated object wave apparatus synoptic diagram.Wherein: label 12 is an object; Label 13 is a reference beam; Label 14 is a hologram; Label 15 is the reflection pincers; Label 16 is a penetration needling.
Claims (2)
1, the high-precision laser holographic automatic detection system of wing-splint honeycomb structure, it is characterized in that: the acoustic transducer in a broadband is fixed on the detected material epidermis, and, epidermis is applied vibration force with the parts that 250 conspicuous ultrasound waves excite 0.120cm and 0.120cm to splice; By laser hologram photography, with time method of average picked-up holographic information, obtain one group of difference interference fringe, again by the laser video picture, with the interference fringe imaging, and image-forming information imported computing machine, can on computer monitor, know and see defective locations shape, the degree of depth and size, and by the printer output written historical materials.
2, the high-precision laser holographic automatic detection system of wing-splint honeycomb structure according to claim 1, it is characterized in that: to the position modulation mutually of reference beam, with the time method of average picked-up hologram time (at object vibration time carry out the exposure of long period), can realize modulation by an oscillating mirror to reference beam position phase, the vibration frequency of catoptron is identical with the vibration frequency of object, like this, just build as the time interference fringe seen the center of intensity distributions field, be displaced to J
0 2The place at first zero point (x), through after this modulation, the displacement of object just looks like around this point, and no longer around the null displacement point, like this, the each point that body surface is not done to vibrate is when hologram reconstructing, become details in a play not acted out on stage, but told through dialogues, thereby improve the sensitivity of body surface displacement measurement, if use reference beam is carried out the position way of modulation mutually, can write down surface vibration less than 50 dusts, and can once note surface vibration, when we excite one 0.120 centimetre during with 0.120 centimetre of parts that splice with 250 kilo hertzs ultrasound wave, surface displacement is the 50 Izod right sides only, hologram with time method of average shooting, a bit can't see vibrational image, after adopting the reference beam phasing technique, the hologram of shooting can be seen the standing wave pattern picture that ultrasonic transducer emits, the standing wave pattern that 1.27 centimetres of three diameters appear in also see simultaneously splice at the interface shows these three local appearance to disconnect as saltation zone.
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| CN200810012014A CN101614677A (en) | 2008-06-25 | 2008-06-25 | The high-precision laser holographic automatic detection system of wing-splint honeycomb structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928433A (en) * | 2012-07-20 | 2013-02-13 | 中国航空工业集团公司北京航空材料研究院 | Metallography detection method for bonding interface having honeycomb sandwich structure |
| CN104067111A (en) * | 2012-01-25 | 2014-09-24 | 波音公司 | Automated system and method for tracking and detecting discrepancies on a target object |
| CN108760766A (en) * | 2018-05-25 | 2018-11-06 | 哈尔滨工业大学 | A kind of image split-joint method of large-aperture optical plane of crystal microdefect detection |
| CN108918667A (en) * | 2018-04-27 | 2018-11-30 | 河海大学常州校区 | A kind of wedge defect inspection method |
-
2008
- 2008-06-25 CN CN200810012014A patent/CN101614677A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104067111A (en) * | 2012-01-25 | 2014-09-24 | 波音公司 | Automated system and method for tracking and detecting discrepancies on a target object |
| CN102928433A (en) * | 2012-07-20 | 2013-02-13 | 中国航空工业集团公司北京航空材料研究院 | Metallography detection method for bonding interface having honeycomb sandwich structure |
| CN108918667A (en) * | 2018-04-27 | 2018-11-30 | 河海大学常州校区 | A kind of wedge defect inspection method |
| CN108918667B (en) * | 2018-04-27 | 2020-09-29 | 河海大学常州校区 | Wedge defect detection method |
| CN108760766A (en) * | 2018-05-25 | 2018-11-06 | 哈尔滨工业大学 | A kind of image split-joint method of large-aperture optical plane of crystal microdefect detection |
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Open date: 20091230 |