CN101290781A - Rapid reading out system and method of holographic data storage - Google Patents
Rapid reading out system and method of holographic data storage Download PDFInfo
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Abstract
The invention relates to a quick read out system and a method of holographic data storage, belonging to the optical storage technical field. The quick read out method is as follows: firstly, a plurality of holograms are recorded at intervals on a holographic medium; then, the high-speed read out of the holograms is realized by means of the synchronous working among precise addressing equipment, an electro-optical switch and high-speed image collection equipment in the state of high-speed motion of the holographic medium. Because the quick read out system of holographic data storage is designed by the method, and consists of a microdrive positioning controller, a pulse generator, high-speed precise addressing equipment, an electro-optical switch, high-speed image collection equipment, a laser and a necessary optical element, the holographic medium is in a high-speed motion state all the time during continuously reading out a plurality of holograms, thereby realizing continuous high-speed read out of the holograms.
Description
Technical field
The rapid reading out system and the method for holographic data storage belong to field of optical storage technology.
Background technology
Along with the development of construction of information expressway and Computer Science and Technology, the quantity of information that needs storage and propagation is in rapid increase, and this has proposed more and more higher requirement to information storage technology.Current society is for the requirement of memory performance, should vast capacity (or high density), also require the high transfer rate of access data.The optical volume holographic storage is the brightest and the clearest developing direction of realizing this goal, and through the research of nearly decades, has obtained considerable achievement in research in holographic mechanism of body and aspects such as super-high density and vast capacity hologram recording material.
The parallel page stores mechanism and the extremely short addressing time of body holographic memory make it might reach very high message transmission rate.What is more important, the introducing of the page composer of high resolving power large format (is SLM as spatial light modulator), pinpoint kinematic system, high-speed photodetector (as CCD and CMOS etc.) and peripheral high speed electronics, the feasibility that provides holographic memory to read fast.Must comprise the function that reads at a high speed as a holographic information storage system complete, practicability, if body hologram memory system can also be realized high-speed data transmission speed simultaneously on the basis of realizing vast capacity, will greatly promote the information science development progress undoubtedly.
At present in the paper that deliver in the holographic storage technology field, relate to read to be in the medium stationary state read reproduced image, that is: give an order by computing machine, the accurate addressing unit (turntable or platform) that driving has recording medium rotates or moves a small distance, after motion finishes, under the medium stationary state, it is carried out light and read, use the image capture device images acquired then, send into Computer Processing with reference light.Obviously this " static state is read " can't reach high read-out speed owing to waits for too long.
Summary of the invention
The objective of the invention is to overcome the shortcoming and defect of above-mentioned holographic memory, a kind of rapid reading out system and method for holographic data storage have been proposed, this method can be read a plurality of holograms that are recorded in the holographic media at a high speed dynamically, promptly in the process of reading a plurality of holograms continuously, holographic media is in the state of high-speed motion all the time.
To achieve these goals, the present invention has taked following technical scheme.Laser instrument, beam splitter, first catoptron, first beam-expanding collimation system, spatial light modulator (SLM), Fourier transform camera lens FTL have been the present invention includes
1, second beam-expanding collimation system, second catoptron, reference light camera lens, high speed and precision addressing unit, holographic media, Fourier transform camera lens FTL
2, be arranged on cable, the thing optical shutter of electrooptical switching, pulse producer, high-speed image sampling equipment, fine motion register control, computing machine, connection computing machine and controlled device between the beam splitter and second beam-expanding collimation system.Wherein:
There are two the pulse output interfaces that can export same pulse signal synchronously at least in described pulse producer, has the external trigger signal input interface simultaneously; Described electrooptical switching has the interface that receives the input of external trigger signal; Described high-speed image sampling equipment has the interface that receives the input of external trigger signal; Described fine motion register control has a Transistor-Transistor Logic level interface.
Two pulse output interfaces of pulse producer link to each other with the interface of the reception external trigger signal input of the interface of the reception external trigger signal of high-speed image sampling equipment input and electrooptical switching respectively; The external trigger signal input interface of pulse producer links to each other with the Transistor-Transistor Logic level interface of fine motion register control, and computing machine is connected with the fine motion register control by himself serial ports, and the fine motion register control also links to each other with the high speed and precision addressing unit.
Pulse producer is when receiving external trigger signal rising edge, according to the pulse signal of recurrence interval that sets in advance and width output consecutive periods; When receiving external trigger signal negative edge, stop output pulse signal.
Electrooptical switching is when receiving external trigger signal rising edge, and order sees through smoothly from the light wave of laser instrument; When receiving external trigger signal negative edge, then make light wave see through from laser instrument, realize black out; Thereby available external trigger pulse signal is controlled the switching frequency of electrooptical switching and the black out ratio that opens the light.
High-speed image sampling equipment begins exposure, stored charge when receiving external trigger signal rising edge; Time shutter length preestablishes, and at the end of time shutter, begins to read and the transmission frame data, thereby has nothing to do with the negative edge of external trigger signal;
High-speed image sampling equipment is to be the camera detector of imageing sensor with CCD or CMOS, and its frame speed is greater than 100 frame per seconds.
If holographic media is the plate-like material, then accurate addressing unit is a turntable, and hologram is distributed on the concentric circular tracks of plate-like material; If holographic media is the card-like material, then accurate addressing unit is the linear translation platform, and hologram is distributed on the linear track of card-like material, and orbital direction is parallel with the moving direction of translation stage.Being distributed between the adjacent hologram on the same track of holographic media has certain space interval, and holographic media is fixed in the high speed and precision addressing unit, can realize the control to the holographic media motion state.
In holographic media high-speed motion process, the high speed electro-optical switch only when reference light can expose to the hologram record position, makes reference light wave pass through smoothly; When reference light can expose to logging interval between the hologram, make reference light wave pass through.
Utilize the rapid reading out system of the holographic data storage among the present invention can realize reading fast of holographic data storage.The quick reading method of holographic data storage, it is a kind of synchronous working of utilizing between high speed and precision addressing unit, high speed electro-optical switch, the high-speed image sampling equipment three, can under the state of the holographic media high-speed motion of recorded hologram, realize the high speed of hologram is read.Its readout is as follows:
1) earlier the high speed and precision addressing unit is moved to a certain before position A of first hologram (supposing that its position is B) that wait is read;
2) accurately measure the high speed and precision addressing unit under acceleration of setting and speed by Survey Software, move to the required precise time T of B by A
w(ms magnitude) will guarantee that simultaneously accurate addressing unit is in the uniform speed motion state when moving to the B point.
3) according to the experiment parameter in the actual acquisition, set the recurrence interval and the width of pulse producer output signal in advance, even the product of the movement velocity of the recurrence interval of pulse producer and accurate addressing unit should equal to be recorded in the interval between the hologram in the holographic media, the pulse width of pulse producer should be not less than the every frame integral time of high-speed image sampling equipment.
4) computing machine is controlled accurate addressing unit by the fine motion register control and is back to A point position by the B point;
5) computing machine sends instruction to the fine motion register control, make accurate addressing unit from the A point by stationary state with step 2) the acceleration and the speed that set begin to move to the B point;
6) at high speed and precision addressing unit motion T
wThe moment, computing machine sends the rising edge of a pulse signal to pulse producer by the Transistor-Transistor Logic level interface of fine motion register control, thereby trigger generator is according to 3) in the recurrence interval and the width that set, trigger them to electrooptical switching and high-speed image sampling equipment output TTL pulse signal and start working.Just accurately move to the position B at first hologram place and the high speed and precision addressing unit of holographic media is installed this moment, thereby first hologram can be read just.
7) since this moment the high speed and precision addressing unit be at the uniform velocity state, and high-speed image sampling equipment and high speed electro-optical switch also carry out work at fixing recurrence interval and the width with pulse producer output simultaneously, promptly realize high speed and precision addressing unit, high speed electro-optical switch, high-speed image sampling equipment three can be in the holographic media high-speed motion state under hologram synchronously with mating collection read.
Effect of the present invention: adopt technology of the present invention, under the situation that can allow in the integral time of accurate addressing unit movement velocity and high-speed image sampling equipment, the high speed that realizes the High-Density Holographic Storage device in the process of storage medium high-speed motion is read, and the data read-out speed can reach 1-10Gb/s in theory.
Description of drawings
Fig. 1 system light path figure;
Fig. 2 dynamically reads the part of 150 width of cloth holograms fast and reads image;
(a) the 1st width of cloth; (b) the 51st width of cloth; (c) the 134th width of cloth; (d) the 150th width of cloth
Among the figure: 1. laser instrument, 2. beam splitter, 3. first catoptron, 4. electrooptical switching, 5. first beam-expanding collimation system, 6. spatial light modulator (SLM), 7. Fourier transform camera lens FTL
1, 8. second beam-expanding collimation system, 9. second catoptron, 10. pulse producer, 11. reference light camera lenses, 12. high speed and precision addressing units, 13. holographic medias, 14. Fourier transform camera lens FTL
2, 15. high-speed image sampling equipment, 16. fine motion register controls, 17. computing machines, 18. connect the cable of computing machine and controlled device, 19. thing optical shutters.
Embodiment
The invention will be further described below in conjunction with Fig. 1:
The rapid reading out system of the holographic data storage among the present invention, system diagram include laser instrument 1, beam splitter 2, first catoptron 3, electrooptical switching 4, first beam-expanding collimation system 5, spatial light modulator (SLM) 6, Fourier transform camera lens FTL referring to Fig. 1
17, second beam-expanding collimation system 8, second catoptron 9, pulse producer 10, reference light camera lens 11, accurate addressing unit 12, holographic media 13, Fourier transform camera lens FTL
214, cable 18, the thing optical shutter 19 of high-speed image sampling equipment 15, fine motion register control 16, computing machine 17, connection computing machine and controlled device.Wherein the frame speed of high-speed image sampling equipment 15 is up to 1000 frame per seconds.
The light that sends from laser instrument 1 is divided into two bundles, a branch of thing optical shutter 19, first catoptron 3, first beam-expanding collimation system 5, spatial light modulator (SLM) 6, Fourier transform camera lens FTL of passing through successively through behind the beam splitter 2
17 arrive the front surface of holographic media 13, become the thing light of holographic recording; Another Shu Yici becomes the reference light of holographic recording through the rear surface of electrooptical switching 4, second beam-expanding collimation system 8, second catoptron 9, reference light camera lens 11 arrival holographic medias 13.The accurate addressing unit 12 that holographic media 13 is controlled by fine motion register control 16 drives.More than constitute the light path that writes of hologram, in ablation process, thing optical shutter 19 and electrooptical switching 4 are all opened.
The rapid reading out system of holographic data storage in the stage of reading, is closed by computing machine 17 control thing optical shutters 19.The light that sends from laser instrument 1 arrives the rear surface of holographic medias 13 successively through beam splitter 2, electrooptical switching 4, second beam-expanding collimation system 8, second catoptron 9, reference light camera lens 11, become the light of reading of holographic recording.Under the irradiation of reading light, the flashlight that goes out from holographic media 13 diffraction passes through Fourier transform camera lens FTL
2Become the reproduced image of holographic recording after 14, gathered by high-speed image sampling equipment 15.Fine motion register control 16 has a universal input/output interface (GPIO, General PurposeInput/Output interface), can export Transistor-Transistor Logic level.This GPIO interface is connected with the external trigger signal input interface of pulse producer 10, can realizes the control of computing machine 17 paired pulses generators 10 duties.Two signal Synchronization output interfaces of pulse producer 10 are connected respectively to high-speed image sampling equipment 15 and electrooptical switching 4, thereby with pulse producer 10 is transmission, can realize the control of 17 pairs of high-speed image sampling equipment 15 of computing machine and electrooptical switching 4 duties.Computing machine 17 is connected with fine motion register control 16 by himself serial ports communicates.Be connected with accurate addressing unit 12 by fine motion register control 16, thus the control of 17 pairs of high speed and precision addressing unit 12 motion states of realization computing machine.
Implementation method of the present invention:
1) uses the rapid reading out system of the holographic data storage of the present invention's design to carry out hologram and read example.At first select holographic media material 13 to be photorefractive crystal: thickness is the Zn:Fe:LiNbO of 3.0mm
3Crystal (0.03wt%Fe, 6mol%Zn), be plate-like, the power of thing light and reference light is respectively 2mW and 8mW, the electronic precise rotating platform of URM80ACC that accurate addressing unit 12 is selected NEWPORT company for use, and be 4.5 °/s with its speed setting, acceleration-deceleration all is set at 5 °/s
2The TGP110 type 10MHz pulse producer that pulse producer 10 adopts U.S. TENMA company to produce, the cycle of output pulse is made as 45Hz (in conjunction with the rotating speed of 4.5 °/s of turntable, can so that two width of cloth image spacings that high-speed image sampling equipment is gathered are 0.1 °), and pulse width is made as 11ms;
2) fine motion register control 16 is the Universal MotionController that produced by U.S. NEWPORT company, and model is ESP300.Computing machine 17 16 is connected and communicates mutually by himself serial ports and fine motion register control, and the GPIO interface of fine motion register control 16 is connected with the external trigger signal input interface of pulse producer 10, again two signal Synchronization output interfaces of pulse producer 10 are connected respectively to the external trigger signal input interface of high-speed image sampling equipment 15 and electrooptical switching 4.Wherein high-speed image sampling equipment 15 is the A504K high-speed cmos camera of German BASLER company and the PIXCI CL3SD image pick-up card of supporting EPIX company thereof; Optoelectronic switch 4 is KD of the QC12-2 model of U.S. QUANTUM scientific ﹠ technical corporation production
*P crystal modulator and supporting model thereof are the high drive power supply of HVP-5LP.Fine motion register control 16 is connected with high speed and precision addressing unit 12.
3) write down 150 holograms in 0 ° of position of holographic media material 13 with 0.1 ° of interval;
4) program ESP-Tuning is regulated in the motion that carries by fine motion register control 16, and accurately measuring accurate addressing unit 12 is 4.5 °/s at rotating speed, and acceleration-deceleration all is 5 °/s
2Situation under, be 1.573s by-5 ° of precise times that move to 0 °; In the time of simultaneously can guaranteeing that accurate addressing unit 12 moves to 0 °, be in the uniform speed motion state.
5) high speed and precision addressing unit 12 is moved to-5 ° of positions;
6) time shutter of high-speed image sampling equipment 15 is set to 11ms.Make electrooptical switching 4 and high-speed image sampling equipment 15 all be in the trigger pip state of waiting for received pulse generator 10 then, pulse producer 10 then is in the trigger pip state that receives fine motion register control 16 of waiting for;
7) by program, send instruction, make accurate addressing unit 12 begin accelerated motion by stationary state from-5 ° of positions to fine motion register control 16 with the CVI establishment;
8) after program is waited for 1.573s, send the rising edge of a pulse signal to pulse producer 10 by the GPIO interface of fine motion register control 16, thereby trigger generator 10 is according to recurrence interval that sets in the step 1) and width, triggers them to electrooptical switching 4 and high-speed image sampling equipment 15 output TTL pulse signals and starts working.And the high speed and precision addressing unit 12 that carry holographic media 13 this moment secretly should accurately move to 0 ° of the position at first hologram place just, thereby first hologram can be read just.
9) because two width of cloth image spacings that high-speed image sampling equipment 15 is gathered are 0.1 °, with be recorded in holographic media 13 in hologram between the interval consistent, and the high speed and precision addressing unit 12 has been in the uniform speed motion state this moment, promptly realize high speed and precision addressing unit 12, high speed electro-optical switch 4, high-speed image sampling equipment 15 threes can be in the holographic media 13 high-speed motion state under hologram synchronously with mating collection read.This example realizes the read-out speed of 45 width of cloth hologram per seconds, can reach the 1M bit owing to every width of cloth hologram comprises data volume, so this example can realize data read-out speed 45Mbit/s.
Fig. 2 has provided the reproduction picture of part hologram.
Claims (8)
1, the rapid reading out system of holographic data storage includes laser instrument (1), beam splitter (2), first catoptron (3), first beam-expanding collimation system (5), spatial light modulator (6), Fourier transform camera lens FTL
1(7), second beam-expanding collimation system (8), second catoptron (9), reference light camera lens (11), accurate addressing unit (12), holographic media (13), Fourier transform camera lens FTL
2(14) and thing optical shutter (19); It is characterized in that: also include the electrooptical switching (4), high-speed image sampling equipment (15), pulse producer (10), fine motion register control (16) and the computing machine (17) that are arranged between polarization beam splitter prism (2) and second beam-expanding collimation system (8); Wherein:
There are two the pulse output interfaces that can export same pulse signal synchronously at least in described pulse producer (10), has the external trigger signal input interface simultaneously; Described electrooptical switching (4) has the interface that receives the input of external trigger signal; Described high-speed image sampling equipment (15) has the interface that receives the input of external trigger signal; Described fine motion register control (16) has a Transistor-Transistor Logic level interface;
Two pulse output interfaces of pulse producer (10) link to each other with the interface of the reception external trigger signal input of the interface of the reception external trigger signal of high-speed image sampling equipment (15) input and electrooptical switching (4) respectively; The external trigger signal input interface of pulse producer (10) links to each other with the Transistor-Transistor Logic level interface of fine motion register control (16), and fine motion register control (16) also links to each other with computing machine (17) with accurate addressing unit (12) respectively.
2, the rapid reading out system of holographic data storage according to claim 1 is characterized in that: described high-speed image sampling equipment (15) is to be the camera detector of imageing sensor with CCD or CMOS.
3, the rapid reading out system of holographic data storage according to claim 1 is characterized in that: described holographic media (13) is the discoid medium that photorefractive crystal, photopolymer or other holographic storage material are made.
4, the rapid reading out system of holographic data storage according to claim 1 is characterized in that: described holographic media (13) is the card-like medium that photorefractive crystal, photopolymer or other holographic storage material are made.
5, the rapid reading out system of holographic data storage according to claim 3 is characterized in that: high speed and precision addressing unit (12) is a turntable, and hologram is distributed on the concentric circular tracks of discoid medium.
6, the rapid reading out system of holographic data storage according to claim 4, it is characterized in that: high speed and precision addressing unit (12) is the linear translation platform, hologram is distributed on the linear track of card-like medium, and orbital direction is parallel with the moving direction of translation stage.
7, the rapid reading out system of holographic data storage according to claim 1 is characterized in that: the frame speed of described high-speed image sampling equipment (15) is greater than 100 frame per seconds.
8, the quick reading method of the rapid reading out system of holographic data storage as claimed in claim 1, it is characterized in that, this method is utilized the synchronous working between accurate addressing unit (12), electrooptical switching (4) and high-speed image sampling equipment (15) three, realizes the high speed of hologram is read under the state of the holographic media of recorded hologram (13) high-speed motion; Specifically may further comprise the steps:
A) be recorded in the product that interval between the hologram in the holographic media (13) equals the movement velocity of recurrence interval of pulse producer (10) and accurate addressing unit (12), every frame of high-speed image sampling equipment (15) is not more than the pulse width of pulse producer (10) integral time;
B) computing machine (17) is controlled accurate addressing unit (12) by fine motion register control (16) and is moved to the first hologram a certain position A point before that wait is read, and the position of supposing first hologram is the B point;
C) measure high speed and precision addressing unit (12) under acceleration of setting and speed by fine motion register control (16), move to B point required time T by the A point
w, guarantee that simultaneously accurate addressing unit (12) is in the uniform speed motion state when moving to the B point;
D) computing machine (17) is controlled accurate addressing unit (12) by fine motion register control (16) and is back to A point position by the B point;
E) accurate addressing unit (12) is begun to move to the B point with acceleration and the speed that sets the step c) by stationary state from the A point;
F) move to T at accurate addressing unit (12)
wThe moment, the accurate addressing unit (12) of promptly carrying holographic media (13) this moment secretly moves to the position B point at first hologram place just, computing machine (17) sends pulse triggering signal by the Transistor-Transistor Logic level interface of fine motion register control (16) to pulse producer (10), make trigger generator (10) according to recurrence interval that sets in the step a) and width, to electrooptical switching (4) and high-speed image sampling equipment (15) output TTL pulse signal, when electrooptical switching (4) receives external trigger signal rising edge, electrooptical switching (4) is opened, order sees through smoothly from the light wave of laser instrument (1), high-speed image sampling equipment (15) begins exposure, stored charge simultaneously; Time shutter length preestablishes, and at the end of time shutter, begins to read and the transmission frame data, and is irrelevant with the negative edge of external trigger signal; When receiving external trigger signal negative edge, electrooptical switching (4) order can't see through from the light wave of laser instrument (1), realizes black out; Electrooptical switching (4) and high-speed image sampling equipment (15) are just with identical like this fixed cycle synchronous working; First hologram is read;
G) accurate addressing unit (12) is in the uniform speed motion state, high-speed image sampling equipment (15) and electrooptical switching (4) were gathered hologram with the fixing same cycle, promptly accomplished the synchronous coupling between accurate addressing unit (12), electrooptical switching (4), high-speed image sampling equipment (15) three, under the state of holographic media (13) high-speed motion, the continuous high speed that is stored in hologram is wherein read.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102621827A (en) * | 2012-04-23 | 2012-08-01 | 杭州士兰明芯科技有限公司 | Maskless exposure system and exposure method thereof |
| CN103064275A (en) * | 2013-01-17 | 2013-04-24 | 京东方科技集团股份有限公司 | Device and method for realizing holographic three-dimensional (3D) images |
| CN103824444A (en) * | 2014-03-04 | 2014-05-28 | 赵威 | Switch adopting over exposure of CCD sensor to realize remote wireless control of laser pen |
| CN107017342A (en) * | 2017-04-11 | 2017-08-04 | 北京工业大学 | A kind of method of the ultrashort pulse picosecond laser induced phase transition materials film crystallization of use different wave length |
| CN111007730A (en) * | 2019-10-22 | 2020-04-14 | 上海瑞立柯信息技术有限公司 | Spatial light modulator control system and control method thereof |
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2008
- 2008-06-18 CN CN200810115109A patent/CN100580778C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102621827A (en) * | 2012-04-23 | 2012-08-01 | 杭州士兰明芯科技有限公司 | Maskless exposure system and exposure method thereof |
| CN102621827B (en) * | 2012-04-23 | 2014-03-12 | 杭州士兰明芯科技有限公司 | Maskless exposure system and exposure method thereof |
| CN103064275A (en) * | 2013-01-17 | 2013-04-24 | 京东方科技集团股份有限公司 | Device and method for realizing holographic three-dimensional (3D) images |
| US9229430B2 (en) | 2013-01-17 | 2016-01-05 | Boe Technology Group Co., Ltd. | Device for recording and reproducing holographic 3D image, and method for recording and reproducing holographic 3D image |
| CN103064275B (en) * | 2013-01-17 | 2016-08-24 | 京东方科技集团股份有限公司 | Holographic 3D realizes device and method |
| CN103824444A (en) * | 2014-03-04 | 2014-05-28 | 赵威 | Switch adopting over exposure of CCD sensor to realize remote wireless control of laser pen |
| CN107017342A (en) * | 2017-04-11 | 2017-08-04 | 北京工业大学 | A kind of method of the ultrashort pulse picosecond laser induced phase transition materials film crystallization of use different wave length |
| CN111007730A (en) * | 2019-10-22 | 2020-04-14 | 上海瑞立柯信息技术有限公司 | Spatial light modulator control system and control method thereof |
| CN111007730B (en) * | 2019-10-22 | 2023-09-26 | 上海瑞立柯信息技术有限公司 | Spatial light modulator control system and control method thereof |
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