CN202421745U - Optical fiber digital holographic speckle removing imaging system - Google Patents
Optical fiber digital holographic speckle removing imaging system Download PDFInfo
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- CN202421745U CN202421745U CN2011203773732U CN201120377373U CN202421745U CN 202421745 U CN202421745 U CN 202421745U CN 2011203773732 U CN2011203773732 U CN 2011203773732U CN 201120377373 U CN201120377373 U CN 201120377373U CN 202421745 U CN202421745 U CN 202421745U
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Abstract
An optical fiber digital holographic speckle removing imaging system belongs to the field of digital holography. The emitting terminal of a laser is provided with an optical fiber coupler, the optical fiber coupler is connected with an optical fiber splitter, two optical fibers running out from the optical fiber splitter are respectively connected to a two-dimensional electric translation bench and an optical fiber holder. The emitting light of the optical fiber connected to the two-dimensional electric translation bench is vertical to the two-dimensional electric translation bench, a lens and a sample are provided at the emitting direction, the optical fiber connected to the two-dimensional electric translation bench is moved horizontally with the two-dimensional electric translation bench, and the line connecting the center of the sample and the center of a beam combining crystal is vertical to one side surface of the beam combining crystal. The emitting light of the optical fiber connected to the optical fiber holder is vertical to the other side surface of the beam combining crystal, this side surface is vertical to the side surface vertical to the sample center, and the side surface opposite to that side surface of the beam combining crystal vertical to the sample center is provided with a CCD, which is connected to the two-dimensional electric translation bench and a computer. According to system, the speckle noise of a digital holographic reproduced image is reduced, and the signal to noise ratio is raised.
Description
Technical field
The utility model discloses a kind of optical fiber and digital holography speckle and remove imaging system, belong to the digital holography techniques field, can be used for three-dimensional appearance and measure in real time and quantitative phase contrast micro-imaging.
Background technology
In 20 years of past, along with the develop rapidly of photoelectric coupled device, Digital Holography realizes high speed development, and extensively applies to the micro-field of submicron-scale, like integrated circuit detection, biological cell real time imagery etc.Digital hologram is as a kind of micro-imaging technique, it is advantageous that harmless, quick, can obtain characteristics such as quantitative phase distribution, its unique advantage makes it have great using value, becomes a kind of important real-time quantitative dynamic analysing method.
Yet owing in the digital hologram system, adopt coherent light illumination, thing followed speckle noise makes a big impact to factors such as system imaging ability and resolution.In the digital reproduction process, adopt methods such as Digital Image Processing, filtering, all can exert an influence picture quality, resolution.And record and reproduce a series of images that to have different speckle noise backgrounds, and can significantly reduce the speckle noise contrast through the method for multistep stack, and improve system signal noise ratio, help the requirement of three-dimensional high definition rate observation.
The utility model content
In order to solve the influence of speckle noise in the digital hologram imaging process, the utility model provides the holographic speckle of a kind of optical fiber and digital and remove imaging system.
The utility model adopts following technical scheme: the holographic speckle of optical fiber and digital is removed imaging system, includes laser instrument 1, fiber coupler 2; Fiber optic splitter 3, optical fiber 4, two-dimentional motorized precision translation stage 5; Computing machine 6, CCD camera 7 closes Shu Jingti 9; Lens 10, fibre holder 8, sample 11; Laser instrument 1 exit end is mounted with fiber coupler 2, and fiber coupler 2 links to each other with fiber optic splitter 3 through optical fiber, and fiber optic splitter 3 picks out two-way optical fiber and is connected on two-dimentional motorized precision translation stage 5 and the fibre holder 8.The emergent light and the two-dimentional motorized precision translation stage of optical fiber 4 that is connected two-dimentional motorized precision translation stage 5 is perpendicular; Be provided with lens 10 and sample 11 to be detected along its exit direction, the outgoing position of the optical fiber 4 that links to each other with two-dimentional motorized precision translation stage 5 moves horizontally with two-dimentional electric platforms 5 and mobile; The center of sample 11 and the line that closes Shu Jingti 9 centers are perpendicular to a side of closing Shu Jingti 11.The emergent light of the optical fiber 4 that is connected with fibre holder 11 is perpendicular to another side of closing Shu Jingti, the perpendicular lateral vertical in this side and sample 11 centers; Be placed with CCD camera 7 with the opposite flank of the perpendicular side of closing Shu Jingti 9, the center of sample 11, CCD camera 7 all links to each other with computing machine 6 with two-dimentional electric platforms 5.
Two dimension motorized precision translation stage 5 belows are equipped with lens 10; Sample 11 to be detected is placed in lens 10 belows; Lens 10 are sidelong to put perpendicular to one of normal direction and are closed Shu Jingti 9, and the exit end of the optical fiber 4 of fibre holder 8 clampings and the centrally aligned of sample 11 close the center of two perpendicular sides of Shu Jingti 8.
The light of laser instrument 1 outgoing is through fiber coupler 2 coupled into optical fibres; And be divided into two-way by fiber optic splitter 3: the first via is the thing light by two-dimentional motorized precision translation stage 5 places outgoing; Lens 10 are collimated into directional light with the spherical light wave of dispersing of optical fiber outgoing; Directional light is radiated on the sample 11 of horizontal positioned, and it diffuses and after closing Shu Jingti 9, is radiated on the CCD camera 7; Another road is the reference light by fibre holder 8 places outgoing, is direct spherical wave by optical fiber 4 terminal outgoing, is radiated at and closes on the Shu Jingti 9, and the reflection back forms hologram by CCD camera 7 records with the thing optical interference.Electronic two-dimentional motorized precision translation stage 5 whenever moves once, and hologram of CCD camera 7 records with all hologram reconstruction picture stacks, obtains the result at last.
Described thing light is the focal length of lens 10 from optical fiber 4 outgoing terminal positions apart from the distance of lens 10; Sample 11 is the focal length of lens 10 apart from the distance of lens 10.
Described reference light, equates with the distance of sample 11 centre distance clutch bundle germ nucleus apart from the distance of closing Shu Jingti 8 centers from optical fiber 4 outgoing terminal positions.
The utility model can be obtained following beneficial effect:
This cover utility model can reduce the speckle noise that digital hologram reproduces picture automatically, improves signal to noise ratio (S/N ratio), helps the requirement of three-dimensional high definition rate observation.
Description of drawings
The holographic speckle of Fig. 1 optical fiber and digital is removed the structure principle chart of imaging system;
Among the figure: 1, Laser Devices, 2, fiber coupler, 3, fiber optic splitter, 4, optical fiber, 5, two-dimentional motorized precision translation stage, 6, computing machine, 7, the CCD camera, 8, fibre holder, 9, close Shu Jingti, 10, lens, 11, sample.
Embodiment
Do further explanation below in conjunction with accompanying drawing and embodiment for the utility model:
Embodiment:
The arrangement of present embodiment is as shown in Figure 1: the holographic speckle of optical fiber and digital is removed imaging system, includes laser instrument 1, fiber coupler 2; Fiber optic splitter 3, optical fiber 4, two-dimentional motorized precision translation stage 5; Computing machine 6, CCD camera 7 closes Shu Jingti 9; Lens 10, fibre holder 8, sample 11; Laser instrument 1 exit end is mounted with fiber coupler 2, and fiber coupler 2 links to each other with fiber optic splitter 3 through optical fiber, and fiber optic splitter 3 picks out two-way optical fiber and is connected on two-dimentional motorized precision translation stage 5 and the fibre holder 8.The emergent light and the two-dimentional motorized precision translation stage of optical fiber 4 that is connected two-dimentional motorized precision translation stage 5 is perpendicular; Be provided with lens 10 and sample 11 to be detected along its exit direction, the outgoing position of the optical fiber 4 that links to each other with two-dimentional motorized precision translation stage 5 moves horizontally with two-dimentional electric platforms 5 and mobile; The center of sample 11 and the line that closes Shu Jingti 9 centers are perpendicular to a side of closing Shu Jingti 11.The emergent light of the optical fiber 4 that is connected with fibre holder 11 is perpendicular to another side of closing Shu Jingti, the perpendicular lateral vertical in this side and sample 11 centers; Be placed with CCD camera 7 with the opposite flank of the perpendicular side of closing Shu Jingti 9, the center of sample 11, CCD camera 7 all links to each other with computing machine 6 with two-dimentional electric platforms 5.
The light of laser instrument 1 outgoing is through fiber coupler 2 coupled into optical fibres; And be divided into two-way by fiber optic splitter 3: the first via is a thing light; Lens 10 are collimated into directional light with the spherical light wave of dispersing of optical fiber outgoing; Directional light is radiated at downwards on the sample 11 of horizontal positioned, and it diffuses and after closing Shu Jingti 9, is radiated on the CCD camera 7; Another road reference light is direct spherical wave by the optical fiber connector outgoing, is radiated at and closes on the Shu Jingti 9, and the reflection back forms hologram by CCD camera 7 records with the thing optical interference.Electronic two-dimentional motorized precision translation stage 5 whenever moves once, and hologram of CCD camera 7 records with all hologram reconstruction picture stacks, obtains the result at last.
Use the 532nm green-light source in the experiment.Sample is the Chinese character " branch " on the coin, used focal length of lens 75mm.The result that the width of cloth hologram reconstruction that system adopts obtains can see speckle noise clearly on it, speckle contrast c=0.2811; Obtaining respectively is the stack result of 3 width of cloth, 18 width of cloth, 72 width of cloth, 144 width of cloth hologram reconstruction pictures, can obviously find out along with noting down increasing of numbers of hologram, and it is more and more littler that speckle noise becomes.Speckle contrast c is respectively 0.0922,0.0177,0.0078,0.0045.Along with numbers of hologram increases, speckle noise decrease of contrast curve can be found out through curve, utilizes this system can effectively reduce speckle noise.
Claims (5)
1. the holographic speckle of optical fiber and digital is removed imaging system, includes laser instrument (1), fiber coupler (2); Fiber optic splitter (3), optical fiber (4), two-dimentional motorized precision translation stage (5); Computing machine (6), CCD camera (7) closes Shu Jingti (9); Lens (10), fibre holder (8), sample (11); It is characterized in that: laser instrument (1) exit end is mounted with fiber coupler (2), and fiber coupler (2) links to each other with fiber optic splitter (3) through optical fiber, and fiber optic splitter (3) picks out two-way optical fiber and is connected on two-dimentional motorized precision translation stage (5) and the fibre holder (8); The emergent light and the two-dimentional motorized precision translation stage of optical fiber (4) that is connected two-dimentional motorized precision translation stage (5) is perpendicular; Be provided with lens (10) and sample (11) to be detected along its exit direction, the outgoing position of the optical fiber (4) that links to each other with two-dimentional motorized precision translation stage (5) moves horizontally with two-dimentional electric platforms (5) and moves; The center of sample (11) and the line that closes Shu Jingti (9) center are perpendicular to a side of closing Shu Jingti (11); The emergent light of the optical fiber (4) that is connected with fibre holder (11) is perpendicular to another side of closing Shu Jingti, the perpendicular lateral vertical in this side and sample (11) center; Be placed with CCD camera (7) with the opposite flank of the perpendicular side of closing Shu Jingti (9), the center of sample (11), CCD camera (7) all links to each other with computing machine (6) with two-dimentional electric platforms (5).
2. the holographic speckle of optical fiber and digital according to claim 1 is removed imaging system; It is characterized in that: described two-dimentional motorized precision translation stage (5) below is equipped with lens (10); Sample (11) to be detected is placed in lens (10) below; Lens (10) are sidelong to put perpendicular to one of normal direction and are closed Shu Jingti (9), and the exit end of the optical fiber (4) of fibre holder (8) clamping and the centrally aligned of sample (11) close the center of two perpendicular sides of Shu Jingti (8).
3. the holographic speckle of optical fiber and digital according to claim 1 is removed imaging system; It is characterized in that: the light of laser instrument (1) outgoing is through fiber coupler (2) coupled into optical fibres; And be divided into two-way by fiber optic splitter (3): the first via is to be located the thing light of outgoing by two-dimentional motorized precision translation stage (5); Lens (10) are collimated into directional light with the spherical light wave of dispersing of optical fiber outgoing, and directional light is radiated on the sample (11) of horizontal positioned, and it diffuses and after closing Shu Jingti (9), is radiated on the CCD camera (7); Another road is a reference light of being located outgoing by fibre holder (8), is directly by the spherical wave of the terminal outgoing of optical fiber (4), is radiated at and closes on the Shu Jingti (9), and the reflection back forms hologram by CCD camera (7) record with the thing optical interference; Electronic two-dimentional motorized precision translation stage (5) whenever moves once, and hologram of CCD camera (7) record with all hologram reconstruction picture stacks, obtains the result at last.
4. the holographic speckle of optical fiber and digital according to claim 3 is removed imaging system, it is characterized in that: described thing light is the focal length of lens (10) from optical fiber (4) outgoing terminal position apart from the distance of lens (10); Sample (11) is the focal length of lens (10) apart from the distance of lens (10).
5. the holographic speckle of optical fiber and digital according to claim 3 is removed imaging system; It is characterized in that: described reference light, equates with the distance of sample (11) centre distance clutch bundle germ nucleus apart from the distance of closing Shu Jingti (8) center from optical fiber (4) outgoing terminal position.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011203773732U CN202421745U (en) | 2011-09-29 | 2011-09-29 | Optical fiber digital holographic speckle removing imaging system |
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| CN2011203773732U CN202421745U (en) | 2011-09-29 | 2011-09-29 | Optical fiber digital holographic speckle removing imaging system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102506746A (en) * | 2011-09-29 | 2012-06-20 | 北京工业大学 | Digital holography imaging system with speckle removing effect by multiple overlaying |
| CN103092049A (en) * | 2013-01-16 | 2013-05-08 | 北京工业大学 | All-solid digital holography imaging system capable of reducing speckle noise |
| CN103941568A (en) * | 2014-03-21 | 2014-07-23 | 北京工业大学 | Multidimensional automatic super-resolution digital holographic imaging device and method |
| CN106094487A (en) * | 2016-08-18 | 2016-11-09 | 中国工程物理研究院激光聚变研究中心 | Terahertz in-line holographic imaging systems based on multiple recording distances and formation method |
-
2011
- 2011-09-29 CN CN2011203773732U patent/CN202421745U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102506746A (en) * | 2011-09-29 | 2012-06-20 | 北京工业大学 | Digital holography imaging system with speckle removing effect by multiple overlaying |
| CN103092049A (en) * | 2013-01-16 | 2013-05-08 | 北京工业大学 | All-solid digital holography imaging system capable of reducing speckle noise |
| CN103941568A (en) * | 2014-03-21 | 2014-07-23 | 北京工业大学 | Multidimensional automatic super-resolution digital holographic imaging device and method |
| CN103941568B (en) * | 2014-03-21 | 2016-06-22 | 北京工业大学 | The automatic super-resolution digital hologram imaging device of multidimensional and method |
| CN106094487A (en) * | 2016-08-18 | 2016-11-09 | 中国工程物理研究院激光聚变研究中心 | Terahertz in-line holographic imaging systems based on multiple recording distances and formation method |
| CN106094487B (en) * | 2016-08-18 | 2019-08-16 | 中国工程物理研究院激光聚变研究中心 | Terahertz in-line holographic imaging method based on multiple recording distances |
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Granted publication date: 20120905 Termination date: 20130929 |