CN101799280A - Hybrid-frequency moire image generation method based on optical-fiber two-dimensional combined coding structure - Google Patents
Hybrid-frequency moire image generation method based on optical-fiber two-dimensional combined coding structure Download PDFInfo
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- CN101799280A CN101799280A CN 201010131099 CN201010131099A CN101799280A CN 101799280 A CN101799280 A CN 101799280A CN 201010131099 CN201010131099 CN 201010131099 CN 201010131099 A CN201010131099 A CN 201010131099A CN 101799280 A CN101799280 A CN 101799280A
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Abstract
The invention relates to a hybrid-frequency moire image generation method based on an optical-fiber two-dimensional combined coding structure, comprising the following steps of: two-dimensionally arraying a plurality of optical fibers in the mutually perpendicular directions in an optical field generator; adding at least one 1*3 type optical fiber coupler and at least one FC (Fiber Channel) optical fiber connector between an LD (Laser Diode) light source and the optical field generator and respectively selecting required optical fiber combinations in the two mutually perpendicular directions; projecting a hybrid-frequency moire image formed by multi-optical fiber interference on a measured object and then reflecting on a CCD (Charge Coupled Device) for receiving the image; and sending the image received by the CCD into a computer for data processing. The method solving the problem of complicated measurement of the surface shapes of phase-step objects realizes the high efficiency of the optical field generator through arraying the optical fibers, and meanwhile, one frame of image has two-dimensional hybrid-frequency information so that the method satisfies the requirements of all-directional, dynamic and real-time measurement and has the advantages of simple technology and easy realization. The adopted optical material and devices are standard optical fiber communication elements and have the advantages of low cost, easy obtainment and convenient generalization.
Description
Technical field
The present invention relates to a kind of optical measurement techniques, particularly a kind of hybrid-frequency moire image generation method based on optical-fiber two-dimensional combined coding structure.
Background technology
In the object dimensional surface shape measurement, the Fourier transform profilometry in the structural light measurement technology is a kind of measuring method easily and efficiently.The double frequency that grows up on this basis, frequency conversion, frequency mixing technique makes phase unwrapping become time domain by the spatial domain, common spatial domain phase place is separated packaging method can can't determine to cause highly measuring distortion because of phase place progression, and measuring error can be expanded, and the time domain phase developing method can obtain the independent phase of each pixel, not only the uncertainty of phase place obtains revising by data fusion, and phase unwrapping is independently to carry out on each pixel, can avoid propagation of error effectively, can solve thus and block phase place and go a difficult problem of wrapping up, and the accurate height of Measuring Object sudden change part, it is not only applicable to measure the object of transitional surface shape, and more is applicable to the object of step face shape.In the above-mentioned structured light projection mode of utilizing the time domain phase developing method, the tool advantage of mixing image projection, it only needs the piece image just can demodulation phase, has satisfied fully dynamically and Testing requirement in real time, for further real application research is laid a good foundation.For this reason, development mixing shadow casting technique is the key that solves various practical problemss.
Summary of the invention
The present invention be directed to one dimension mixing image the restriction in object sudden change orientation and three-dimensional surface are measured in the problem of distortion, a kind of hybrid-frequency moire image generation method based on optical-fiber two-dimensional combined coding structure has been proposed, realized comprehensive measurement, had remarkable advantages for the face shape of complexity sudden change object.It utilizes launch and information fusion two-way time phase, has improved measuring accuracy, has guaranteed measuring reliability and real-time, and optical fiber sensing probe is small and exquisite flexible, with low cost simultaneously.
Technical scheme of the present invention is: a kind of hybrid-frequency moire image generation method based on optical-fiber two-dimensional combined coding structure, method comprises the steps:
1) in the light field maker, on mutually perpendicular direction, carries out two dimension by multifiber and structure the formation;
2) between LD light source and light field maker, be added with at least one 1 * 3 type fiber coupler and at least one FC joints of optical fibre, on two mutually perpendicular directions, choose the optical fiber combination that needs respectively;
3) the mixing Mohr's circle of many fiber optic interferometrics formation looks like to project on the measured object, reflexes to CCD again and goes up the reception image;
4) image of CCD reception is sent into and is carried out data processing in the computing machine.
When the fiber end face in the described light field maker was laid, optical fiber can closely be arranged, and also different spacing parameters can be set; Optical fiber can be set as the T font by cloth, also can be set as cross by cloth.
Described LD light source can be dual wavelength LD light source or two light source.
Beneficial effect of the present invention is: the hybrid-frequency moire image generation method that the present invention is based on optical-fiber two-dimensional combined coding structure, solve a kind of method of complicated step objects surface shape measurement problem, by structuring the formation to many optical fiber, realized the high efficiency of light field maker, a two field picture has two-dimentional mixing information simultaneously, guaranteed comprehensive, dynamic, real-time Testing requirement, technology is simple, easily realizes.Fiber optic materials that is adopted and device are the standard fiber communication device, and cost is low, easily obtain, and are convenient to promote.
Description of drawings
Fig. 1 is the hybrid-frequency moire image generation method experiment measuring system chart that the present invention is based on optical-fiber two-dimensional combined coding structure;
Fig. 2 the present invention is based on light field maker end view drawing in the hybrid-frequency moire image generation method of optical-fiber two-dimensional combined coding structure.
Embodiment
This method realizes many fiber optic interferometrics by carrying out the light field maker that two dimension is structured the formation by multifiber on mutually perpendicular direction, thereby obtains two-dimentional mixing More interference image.
The ultimate principle of the inventive method is based on many fiber optic interferometrics and Information Fusion.System as shown in Figure 1, LD light source 10 connects FC connector 11, FC connector 11 links to each other with 1 * 3 type fiber coupler 12 again, 1 * 3 type fiber coupler 12 links to each other with FC connector 13, one end of many single-mode fibers in the light field maker 14 links to each other with FC connector 13, other end cloth is set as two-dimensional combined coding structure, we interfere at three optical fiber that can choose various combination as required, interference optical field projects on the measured object 15, reflex to CCD16 and go up the reception image, final image is sent into and is carried out data processing in the computing machine 17.We can utilize dual wavelength LD light source 10, on mutually perpendicular direction, obtain two and overlap the independently stacking diagram of mixing image, pass through Fourier transform then, in frequency domain, respectively both direction is carried out data processing, again by information fusion technology, object deformation process (as reverse, expand, contraction etc.) and object are realized comprehensive, dynamic, real-time measurement from the geometric scale of face.
In this light field maker 14, carrying out two dimension by multifiber on mutually perpendicular direction structures the formation, light field maker end view drawing as shown in Figure 2, difference according to measuring condition and object under test, can on two mutually perpendicular directions, choose three different optical fiber combination respectively, as select optical fiber 2,3,7 and optical fiber 2 ', 3 ', 7 ' realize three fiber optic interferometrics, thereby obtain multiple required two-dimentional mixing More interference image.Be added with two 1 * 3 type fiber couplers 12 and a plurality of FC joints of optical fibre 11,13 in this system between LD light source 10 and the light field maker, be convenient on mutually perpendicular direction, choose two groups of optical fiber as required, generate two-dimentional mixing Mohr's circle picture.
When the fiber end face in the described light field maker 14 was laid, optical fiber can closely be arranged, and also can different spacing parameters be set according to actual conditions; Optical fiber can be set as the T font by cloth, also can cloth be set as cross etc.
Claims (3)
1. the hybrid-frequency moire image generation method based on optical-fiber two-dimensional combined coding structure is characterized in that method comprises the steps:
1) in the light field maker, on mutually perpendicular direction, carries out two dimension by multifiber and structure the formation;
2) between LD light source and light field maker, be added with at least one 1 * 3 type fiber coupler and at least one FC joints of optical fibre, on two mutually perpendicular directions, choose the optical fiber combination that needs respectively;
3) the mixing Mohr's circle of many fiber optic interferometrics formation looks like to project on the measured object, reflexes to CCD again and goes up the reception image;
4) image of CCD reception is sent into and is carried out data processing in the computing machine.
2. according to the described hybrid-frequency moire image generation method of claim 1, it is characterized in that when the fiber end face in the described light field maker was laid, optical fiber can closely be arranged, and also different spacing parameters can be set based on optical-fiber two-dimensional combined coding structure; Optical fiber can be set as the T font by cloth, also can be set as cross by cloth.
3. according to the described hybrid-frequency moire image generation method of claim 1, it is characterized in that described LD light source can be dual wavelength LD light source or two light source based on optical-fiber two-dimensional combined coding structure.
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Citations (5)
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| US5416591A (en) * | 1992-06-25 | 1995-05-16 | Matsushita Electric Works, Ltd. | Method of determination of a three-dimensional profile of an object |
| JPH10239031A (en) * | 1997-02-28 | 1998-09-11 | Olympus Optical Co Ltd | Three-dimensional measuring device |
| CN101329184A (en) * | 2008-07-30 | 2008-12-24 | 哈尔滨工程大学 | Combination measuring instrument of optical fiber Mach-Zehnder and Michelson interferometer array |
| CN101349576A (en) * | 2008-09-03 | 2009-01-21 | 吴亚明 | Optical fiber position digital encoder and uses thereof |
| US7551293B2 (en) * | 2003-11-28 | 2009-06-23 | The General Hospital Corporation | Method and apparatus for three-dimensional spectrally encoded imaging |
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2010
- 2010-03-24 CN CN2010101310990A patent/CN101799280B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5416591A (en) * | 1992-06-25 | 1995-05-16 | Matsushita Electric Works, Ltd. | Method of determination of a three-dimensional profile of an object |
| JPH10239031A (en) * | 1997-02-28 | 1998-09-11 | Olympus Optical Co Ltd | Three-dimensional measuring device |
| US7551293B2 (en) * | 2003-11-28 | 2009-06-23 | The General Hospital Corporation | Method and apparatus for three-dimensional spectrally encoded imaging |
| CN101329184A (en) * | 2008-07-30 | 2008-12-24 | 哈尔滨工程大学 | Combination measuring instrument of optical fiber Mach-Zehnder and Michelson interferometer array |
| CN101349576A (en) * | 2008-09-03 | 2009-01-21 | 吴亚明 | Optical fiber position digital encoder and uses thereof |
Non-Patent Citations (2)
| Title |
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| 《光子学报》 20040131 苑立波等 二维光纤传感探头(英文) 35-39 第33卷, 第01期 2 * |
| 《哈尔滨工程大学学报》 20020430 梁艺军等 光纤二维粗糙度传感器 87-90 第23卷, 第02期 2 * |
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