CN102353453B - Method for reconstructing flow field of optical fiber beams - Google Patents
Method for reconstructing flow field of optical fiber beams Download PDFInfo
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- CN102353453B CN102353453B CN 201110248842 CN201110248842A CN102353453B CN 102353453 B CN102353453 B CN 102353453B CN 201110248842 CN201110248842 CN 201110248842 CN 201110248842 A CN201110248842 A CN 201110248842A CN 102353453 B CN102353453 B CN 102353453B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000005855 radiation Effects 0.000 claims abstract description 11
- 230000003595 spectral effect Effects 0.000 claims abstract description 8
- 210000001503 joint Anatomy 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 claims description 30
- 238000004587 chromatography analysis Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000008707 rearrangement Effects 0.000 claims description 3
- 230000000007 visual effect Effects 0.000 abstract description 6
- 230000001360 synchronised effect Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 238000003325 tomography Methods 0.000 abstract 2
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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- Investigating Or Analysing Materials By Optical Means (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The invention discloses a method for reconstructing a flow field of optical fiber beams. The method comprises the steps: as infrared radiation exists in all external directions of a flow field to be tested, a plurality of hollow infrared optical fiber beams are arranged in a space to be subjected to data acquisition in a plurality of directions so as to collect radiation intensity data of the flow field to be tested along a plurality of directions of the space; during butt joint, each optical fiber beam corresponds to a part in an infrared focal plane array, a main computer is used for sending synchronous exposure control signals to each sensor driving circuit of the infrared focal plane array through a control and data acquisition card, and rearranging detection data in various directions; and an emission spectral tomography inversion reconstruction algorithm is used to obtain the three-dimensional physical quantity distribution of the flow field to be tested at a certain moment. The method disclosed by the invention has the technical effects that the visual angles of the optical fiber beams and the distances of the optical fiber beams to a target are both unrestraint, the limit to a test environment can be eliminated, and the practicability of an emission spectral tomography test is greatly increased.
Description
Technical field
The present invention relates to a kind of fibre bundle method for reconstructing flow field.
Background technology
The emission spectral chromatography technology is a kind of reconstructing flow field technology, and its light path is simpler, is not subject to the influence of external environment, and its data obtain manner has two kinds: a kind of mode that is based on scanning, a kind of mode that is based on area array sensor.Mode based on scanning needs spended time to scan, and can't guarantee the real-time that data are obtained; Mode based on area array sensor can guarantee the real-time that data are obtained, but generally be to utilize lens imaging in its light path, usually adopt a plurality of visual angles of dividing equally of same periphery, and area array sensor all equates to the distance in the center of circle, carry out data acquisition, the visual angle is that classical spectrum chromatography is divided, though when the tomographic reconstruction algorithm is realized, be easier to, but when practical application, restriction as environmental factor, divide equally the visual angle, the requirement that equidistantly reaches concyclic side face can't be satisfied, and the method also just can't be suitable for.
Summary of the invention
The object of the present invention is to provide a kind of fibre bundle method for reconstructing flow field, this method is a plurality of hollow infrared optical fiber bundles of some directions installations in the space that needs image data, to collect flow field to be measured along the parallel radiation intensity data of a plurality of directions in space, a plurality of hollow infrared optical fiber bundles are connected with the infrared focal plane array sensor, satisfy the requirement of collimated beam reconstructing flow field inverting, thereby improve the precision of reconstructing flow field computing, and this method is to the visual angle of fibre bundle, distance from target does not all have constraint, can eliminate the restriction of test environment, improve the practicality of emission spectral chromatography test greatly.
The present invention is achieved like this, method is: all there is infrared radiation in the external all directions in flow field to be measured, some directions are installed a plurality of hollow infrared optical fiber bundles in the space that needs image data, to collect flow field to be measured along the radiation intensity data of a plurality of directions in space, owing to form the coupling requirement of each root optical fiber input aperture of fibre bundle, therefore has only nearly parallel radiation ability coupled into optical fibres, several fibre bundles are connected with an infrared focal plane array sensor, when butt joint, part in the corresponding infrared focal plane array of each fibre bundle, be the valid data districts and in each fibre bundle, have only square area, be the invalid data district between the square and circular covering, principal computer sends synchronous exposure control signal to each infrared focal plane array sensor drive driving circuit by control and data collecting card, carry out the flow field to be measured synchronous collection of multi-direction radiation signal in a flash, after signals collecting finishes, principal computer sends the signal output order to each infrared focal plane array sensor drive driving circuit by control and data collecting card, to obtain the infrared image output of multi pass acquisition, principal computer carries out infrared image processing, the signal in extracted valid data zone at first, and it is corresponding with the sequence number of fibre bundle, subsequently spherical co-ordinate is carried out to the conversion of Cartesian coordinates in the ray orientation of the correspondence of every optical fiber in each fibre bundle, and carry out the rearrangement of all directions detection data, through emission spectral chromatography inverting reconstruction algorithm, obtain flow field to be measured three-dimensional physical quantity in a flash and distribute.
Technique effect of the present invention is: the visual angle of fibre bundle, all do not have constraint from the distance of target, can eliminate the restriction of test environment, improve the practicality of emission spectral chromatography test greatly.
Description of drawings
Fig. 1, Fig. 2 are schematic diagram of the present invention.
Flow field to be measured 2, the infrared biography light of hollow optical fiber 3, fibre bundle 4, infrared focal plane array sensor 5, driving circuit 6, sleeve 7, control signal 8, infrared image output 9, control and data collecting card 10, principal computer 11, spheric coordinate system in the drawings, 1.
Embodiment
Principle of the present invention as shown in Figure 1, all there is infrared radiation in the 1 pair of external space all directions in flow field to be measured, at all directions key position the infrared biography light of hollow optical fiber 2 is installed, the infrared biography light of hollow optical fiber opsition dependent and direction are divided into groups, arrange in order for every group, form equally distributed square sectional, add propping material and covering, form cross sectional shape can carry out the infrared biography light of the every hollow optical fiber of each fibre bundle with spheric coordinate system 11 for circular fibre bundle 3. geometric description, the coordinate parameters at the incident end face center of each fibre bundle is (Z, j, f), therefore the coordinate at the incident end face center of each fibre bundle does not all have constraint, has eliminated the actual measurement environmental limit. fibre bundle 3 directly is connected with infrared focal plane array sensor 4, infrared focal plane array sensor 4 can with a plurality of fibre bundle (Z
1, j
1, f
1), (Z
2, j
2, f
2) ..., (Z
n, j
n, f
n) butt joint, as shown in Figure 2, when butt joint, part in the corresponding infrared focal plane array of each fibre bundle, be the valid data districts and in each fibre bundle, have only square area, being the invalid data district between the square and circular covering. infrared focal plane array sensor drive driving circuit 5 can provide and drive sequential, control and radiation light intensity to the conversion of infrared digital image. and infrared focal plane array sensor 4 and driving circuit 5 are installed in the sleeve 6, to eliminate the influence of extraneous parasitic light.When flow-field test begins, principal computer 10 sends synchronous exposure control signal 7 to each infrared focal plane array sensor drive driving circuit 5 by control and data collecting card 9, carry out the flow field to be measured synchronous collection of multi-direction radiation signal in a flash. after signals collecting finishes, principal computer 10 sends the signal output order to each infrared focal plane array sensor drive driving circuit 5 by control and data collecting card 9, export 8. by behind control and the data collecting card 9 acquisition infrared images with the infrared image that obtains multi pass acquisition, principal computer 10 carries out infrared image processing, the at first feature difference on infrared image according to fibre bundle valid data district and invalid data district, select a suitable image threshold, carrying out simple image cuts apart, signal with the extracted valid data district, and it is corresponding with the sequence number of fibre bundle, subsequently spherical co-ordinate is carried out to the conversion of Cartesian coordinates in the ray orientation of every optical fiber correspondence in each fibre bundle, and carry out the rearrangement of all directions detection data, through emission spectral chromatography inverting reconstruction algorithm, obtain flow field to be measured three-dimensional physical quantity in a flash and distribute.
Claims (1)
1. fibre bundle method for reconstructing flow field, it is characterized in that method is: all there is infrared radiation in the external all directions in flow field to be measured, some directions are installed a plurality of hollow infrared optical fiber bundles in the space that needs image data, each fibre bundle is connected with an infrared focal plane array sensor, when butt joint, part in the corresponding infrared focal plane array of each fibre bundle, be the valid data districts and in each fibre bundle, have only square area, be the invalid data district between the square and circular covering, when principal computer carries out infrared image processing, the at first feature difference on infrared image according to fibre bundle valid data district and invalid data district, select a suitable image threshold, carrying out simple image cuts apart, signal with the extracted valid data district, and it is corresponding with the sequence number of fibre bundle, subsequently spherical co-ordinate is carried out to the conversion of Cartesian coordinates in the ray orientation of every optical fiber correspondence in each fibre bundle, and carry out the rearrangement of all directions detection data, through emission spectral chromatography inverting reconstruction algorithm, obtain flow field to be measured three-dimensional physical quantity in a flash and distribute.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110248842 CN102353453B (en) | 2011-08-27 | 2011-08-27 | Method for reconstructing flow field of optical fiber beams |
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| CN 201110248842 CN102353453B (en) | 2011-08-27 | 2011-08-27 | Method for reconstructing flow field of optical fiber beams |
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| CN102353453A CN102353453A (en) | 2012-02-15 |
| CN102353453B true CN102353453B (en) | 2013-07-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589696A (en) * | 2012-03-03 | 2012-07-18 | 南昌航空大学 | Infrared colorimetric emission spectrum chromatography method based on optical fiber bundle shunt sensing |
| CN106525244B (en) * | 2016-10-13 | 2019-04-02 | 中国科学院上海技术物理研究所 | A kind of infrared fusion visual detection system |
| CN114240755B (en) * | 2021-12-21 | 2023-07-18 | 中国科学院光电技术研究所 | Image super-resolution reconstruction method based on optical fiber bundle and micro-scanning technology |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101625266A (en) * | 2009-08-13 | 2010-01-13 | 南昌航空大学 | Infrared chromatography method for fixed fiber image transmission in free space |
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| IL150243A (en) * | 2002-06-16 | 2010-05-31 | Rafael Advanced Defense Sys | Method and system for evaluating optical disturbances occuring in a supersonic flow field |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101625266A (en) * | 2009-08-13 | 2010-01-13 | 南昌航空大学 | Infrared chromatography method for fixed fiber image transmission in free space |
Non-Patent Citations (4)
| Title |
|---|
| CCD光谱层析技术重建氩等离子束射流三维温度场;邢键等;《光谱学与光谱分析》;20091130;第29卷(第11期);3023-3027 * |
| 李智伟等.红外测温系统设计与实现.《应用科技》.2010,第37卷(第5期),24-28. |
| 红外测温系统设计与实现;李智伟等;《应用科技》;20100531;第37卷(第5期);24-28 * |
| 邢键等.CCD光谱层析技术重建氩等离子束射流三维温度场.《光谱学与光谱分析》.2009,第29卷(第11期),3023-3027. |
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