CN102073145A - Speckle elimination device based on Mie scattering and Brownian motion - Google Patents
Speckle elimination device based on Mie scattering and Brownian motion Download PDFInfo
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- CN102073145A CN102073145A CN 201110031499 CN201110031499A CN102073145A CN 102073145 A CN102073145 A CN 102073145A CN 201110031499 CN201110031499 CN 201110031499 CN 201110031499 A CN201110031499 A CN 201110031499A CN 102073145 A CN102073145 A CN 102073145A
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- mie scattering
- speckle
- solution
- speckle elimination
- optical reflection
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
Abstract
The invention relates to the technical field of displaying by taking coherent light as a light source, and in particular relates to a speckle elimination device based on Mie scattering and Brownian motion, aiming at solving the problems of poor speckle elimination effect, complex implementation structure, high possibility of damage, high cost and the like existing in the existing speckle elimination method. The speckle elimination device based on Mie scattering and Brownian motion comprises a sealed optical reflecting cavity provided with an incident light coupling device and a transmission and emergence surface; all the inner walls of the sealed optical reflecting cavity, except the inner walls of the transmission and emergence surface, are mirror surface inner walls; the sealed optical reflecting cavity is fully filled with a solution or a sol; and insulating particles which are in proper dimension to lead to the Mie scattering of incident laser are scattered in the solution or sol. The speckle elimination device based on Mie scattering and Brownian motion has the advantages of simple and compact structure, low manufacturing cost, good speckle elimination effect, high laser utilization ratio, stable performance and light uniformizing function, is easy to implement and is safe and reliable.
Description
Technical field
The present invention relates to the coherent light is the display technique field of light source, specifically is a kind of speckle cancellation element based on Mie scattering and Brownian movement, is primarily aimed at the optics speckle phenomena that exists in laser display technology and the optical instrument.
Background technology
When being the light source irradiation screen,, cause human eye to see the image that is covered by speckle, have a strong impact on image displaying quality, hinder the observer and from image, extract useful information because the coherence of laser and screen is coarse with laser.Therefore, how to eliminate speckle is to be the optical instrument field of light source and the research and development focus in the display technique field with laser always.And with regard to present result of study, roughly can be divided into two big classes for eliminating the used method of speckle: one, the temporal coherence by the control LASER Light Source reduces speckle, its principle is to produce the boiling speckle by adjusting optical maser wavelength (perhaps frequency) and multi wave length illuminating source, successfully eliminates hot spot by control Laser Time coherence at present and reaches the practical technical scheme that requires and be superposed to the master with multiple light courcess basically; Two, eliminate speckle by control laser beam spatial coherence, it is the main method of eliminating speckle at present, ultimate principle is to adjust the PHASE DISTRIBUTION of primitive light wave in the laser beam, thereby change the space distribution of speckle, a plurality of speckle images are superimposed in integral time at human eye, obtain the image that a luminous energy is evenly distributed, and then realize eliminating the purpose of speckle.Concrete method has: adopt rotation scatterer, vibration screen, vibration to have Hadamard figure scatterer, dither optical fiber etc.Said method, or will be, even need high frequency or significantly vibration, or want integrated multiple light courcess by mechanical vibration, the implementation structure complexity, fragile, cost is high, main is that speckle is eliminated poor effect.
Technical scheme by mechanical vibration is also arranged not, for example: the patent No. is that 200820122639.7 Chinese patent discloses " a kind of decohering and shimming device based on scattering ", require to use contain diameter must be less than the scattering medium of the particle of lambda1-wavelength 1/10th, to realize that incident laser is formed Rayleigh scattering.Utilize inorganic salts or organic alcohol solution (as NaCl, KCl, KNO in the patent
3Or ZnSO
4Aqueous solution) as scattering medium, existence form based on inorganic salts or organic alcohol solution is hydrated ion or big molecule, little a lot of with respect to optical maser wavelength, can form Rayleigh scattering to incident laser, realize the incident laser beam splitting with this, and in photoconductive tube, conduct, eliminate speckle in the hope of the coherence who reduces incident laser, utilize the mixed light effect of photoconductive tube simultaneously, above-mentioned beam splitting light is carried out homogenize come the shimming eliminating coherence.But test by the described technical method of this application, at room temperature, utilize length to eliminate speckle for 50mm, the photoconductive tube that is full of saturated NaCl aqueous solution, the result as shown in Figure 1, its speckle contrast is 70%, does not almost play the effect that reduces speckle.
Summary of the invention
The present invention provides a kind of speckle cancellation element based on Mie scattering and Brownian movement for problems such as the elimination speckle poor effect that solves existing speckle removing method and exist, implementation structure complexity, fragile, cost height.
The present invention adopts following technical scheme to realize: based on the speckle cancellation element of Mie scattering and Brownian movement, comprise the enclosed optical reflection cavity which is provided with incident light coupling device and transmission exit facet, it (is that inwall has the high reflectance characteristic that the inwall of enclosed optical reflection cavity except that transmission exit facet inwall is all " minute surface " inwall, energy " total reflection " is incident in the laser beam in the optical reflection chamber), be filled with the solution or the colloidal sol that are full of whole enclosed optical reflection cavity in the enclosed optical reflection cavity, and be scattered with the insulating particles that its dimension can cause incident laser generation Mie scattering in solution or the colloidal sol.
During application, as shown in Figure 4, incide in the solution or colloidal sol in the optical reflection chamber by the incident light coupling device of LASER Light Source emission laser beam on the optical reflection chamber, with the insulating particles effect generation Mie scattering of scattering in solution or the colloidal sol (as shown in Figure 3, when Mie scattering takes place in incident laser 101 irradiation insulating particles 402, scattered light light distribution after incident laser 101 scatterings is in a very wide angular range, mainly concentrate on forward scattering light 104,105,106, generally account for total scattering more than 90%; 102 of rear orientation lights account for very fraction, usually less than 10%; Scattered light 105 light intensity along the incident laser working direction are the strongest, the scattered light 103,107 of vertical direction is the most weak, therefore incident laser is after insulating particles 402 scatterings, be beamed into the scattered light that a plurality of intensity do not wait, the scattering angle of scattered light distributes and enlarges simultaneously), be beamed into the scattered light that a plurality of intensity do not wait, or reflect through the optical reflection cavity wall, or once more with solution or colloidal sol in the insulating particles effect generation Mie scattering of scattering, the scattered light beam splitting is more scattered light, after Mie scattering repeatedly, by the transmission exit facet outgoing in optical reflection chamber; Because solution or colloidal sol medium particle are being done irregular Brownian movement always, incident laser can with medium of movement particle chance mechanism generation Mie scattering in solution or the colloidal sol, the scattered light of incident laser can the randomly changing direction of propagation and path in solution or colloidal sol constantly to make each, finally in PHASE DISTRIBUTION, the scattering angle distribution random variation of the scattered light of optical reflection chamber exit facet outgoing.And the outgoing scattered light in the different moment has different PHASE DISTRIBUTION, scattering angle distributes, and after projection, can correspondingly produce a speckle image respectively; In human eye integral time (50ms), a plurality of speckle images are superimposed, can obtain the image that a luminous energy is evenly distributed, and then realized eliminating the purpose of speckle phenomena.
Compared with prior art, setting of the present invention is full of the optical reflection chamber of solution or colloidal sol, in the optical reflection chamber, cause incident laser generation Mie scattering with the insulating particles that scatter in solution or the colloidal sol, carry out the scattering beam splitting, and based on the random Brownian movement of insulating particles in solution or colloidal sol, the direction of propagation and the path of randomly changing scattered beam in the optical reflection chamber makes optical reflection chamber exit facet at the scattered light of different time with different PHASE DISTRIBUTION and scattering angle distribution outgoing incident laser; Thereby produce the space distribution of speckle after the change projection, make a plurality of speckle images superimposed in integral time, obtain the image that a luminous energy is evenly distributed, and then effectively eliminate speckle at human eye.And through experimental test, use device of the present invention after, the speckle contrast of image can be lower than 4%, as shown in Figure 5, the speckle contrast of image has been low to moderate 2.78%, speckle is eliminated works very well; And can improve speckle by the insulating particles concentration in the temperature, solution or the colloidal sol that improve solution or colloidal sol and eliminate effect; And the random Brownian movement of the solution of foundation of the present invention or colloidal sol medium particle belongs to the SMA phenomenon, need not the driving of outside energy, makes the one-piece construction of device of the present invention remain static, and has more advantage than prior art; The present invention carries out " total reflection " to incident laser in the optical reflection chamber, the overall light loss of energy of incident laser is very little, has guaranteed the high usage of laser, and has realized even light purpose in " total reflection " process; In addition, the used optical reflection cavity configuration of the present invention is very common, and solution, colloidal sol also need not select special material, has the advantage of low cost.
The present invention is rational in infrastructure, compact, realizes that easily cost is low, and speckle is eliminated effective, laser utilization factor height, and stable performance, safe and reliable, and have even light function.
Description of drawings
Fig. 1 utilizes a prior art to eliminate the test result figure that speckle obtains;
Fig. 2 is a structural representation of the present invention;
Fig. 3 is the light intensity angle distribution plan of Mie scattering;
Fig. 4 is the transmission state synoptic diagram of device inner light beam of the present invention;
Fig. 5 utilizes device of the present invention to eliminate the test result figure that speckle obtains;
Fig. 6 is the application synoptic diagram of device of the present invention in the spot scan display system;
Fig. 7 is the application synoptic diagram of device of the present invention in the full frame display system;
Among the figure: the 101-incident laser; 102,103,104,105,106,107-scattered light;
300-speckle cancellation element; 301-incident light coupling device; 302-enclosed optical reflection cavity; 303-transmission exit facet; The 304-entrance pupil; 305,306,307-speckle cancellation element;
401-solution or colloidal sol; The 402-insulating particles;
501,502,503-laser instrument;
601,602,603-signal source;
The 700-lens; The 701-relay lens; 702-photomodulator DLP; The 703-TIR prism; The 704-relay lens; The 705-TIR prism; 706-photomodulator DLP; The 707-relay lens; The 708-level crossing; The 709-TIR prism; 710-photomodulator DLP; The 711-prism; 712-micro scanning mirror;
The 800-screen.
Embodiment
As shown in Figure 2, speckle cancellation element based on Mie scattering and Brownian movement, comprise the enclosed optical reflection cavity 302 which is provided with incident light coupling device 301 and transmission exit facet 303, it (is that inwall has the high reflectance characteristic that the inwall of enclosed optical reflection cavity 302 except that transmission exit facet 303 inwalls is all " minute surface " inwall, energy " total reflection " is incident in the laser beam in the optical reflection chamber), be filled with the solution or the colloidal sol 401 that are full of whole enclosed optical reflection cavity 302 in the enclosed optical reflection cavity 302, and be scattered with the insulating particles 402 that its dimension can cause incident laser 101 generation Mie scatterings in solution or the colloidal sol 401.
During concrete enforcement, described solution is organic solution or inorganic solution; Described colloidal sol is gasoloid or lyosol; Described insulating particles 402 can adopt polystyrene microsphere, TiO 2 particles (TiO
2) wait insulating particles; Described enclosed optical reflection cavity 302 multiselects are made of metal, level crossing, transparent plastic or glass processing, and its shape need not special qualification, the general tubular housings that adopt more; The transmission exit facet 303 surperficial multiselects of enclosed optical reflection cavity 302 are made of transparent plastic or glass processing, and mostly are rectangle plane or circular flat, and the surface is provided with the anti-reflection film that mates with incident laser 101 wave bands;
Incident light coupling device 301 on the described enclosed optical reflection cavity 302 can be realized by following structure: adopt the transmission plane of incidence, and be provided with the anti-reflection film that mates with incident laser 101 wave bands on the surface; Perhaps adopt the entrance pupil structure, and on entrance pupil 304, be equipped with optical coupling element, as: lens.
Speckle cancellation element of the present invention can be applied in the laser projection display technology, for example: as shown in Figure 6, be applied to spot scan projection (Raster-Scanned Displays) system, signal source 601,602,603 is modulated tricolor laser device 501,502,503 output powers respectively according to the information of each pixel on the two dimensional image; Three incident lasers incident speckle cancellation element 300 of the present invention that is coupled is simultaneously derived in exit facet after modulating, and scioptics 700 and micro scanning mirror (Scan Mirror) 712 projects to screen 800.Under the driving of electric signal, micro scanning mirror 712 pursues picture element scan to screen according to two dimensional image.Should be applicable to that the laser-projector of spot scan and laser television show with example.
As shown in Figure 7, be applied to full frame Display projector (Full-Frame Displays) system, tricolor laser device 501,502,503 output firm power laser beams, coupling imports speckle cancellation element 305,306,307 of the present invention respectively; After modulation, by relay lens 701,704,707, level crossing 708 and TIR prism 703,705,709 converge to photomodulator DLP 702,706,710; Photomodulator DLP 702,706,710 generates monochrome image according to every frame 2 dimension image information modulation; Tristimulus image is warm through prism 711, is projected to screen 800 by lens 700.Should be applicable to that laser-projector and laser television based on optical modulation devices such as DMD, LCOS show with example.
Claims (5)
1. speckle cancellation element based on Mie scattering and Brownian movement, it is characterized in that: comprise the enclosed optical reflection cavity (302) which is provided with incident light coupling device (301) and transmission exit facet (303), the inwall of enclosed optical reflection cavity (302) except that transmission exit facet (303) inwall is all " minute surface " inwall, be filled with the solution or the colloidal sol (401) that are full of whole enclosed optical reflection cavity (302) in the enclosed optical reflection cavity (302), and be scattered with the insulating particles (402) that its dimension can cause incident laser (101) generation Mie scattering in solution or the colloidal sol (401).
2. the speckle cancellation element based on Mie scattering and Brownian movement according to claim 1 is characterized in that: described solution is organic solution or inorganic solution.
3. the speckle cancellation element based on Mie scattering and Brownian movement according to claim 1 is characterized in that: described colloidal sol is gasoloid or lyosol.
4. the speckle cancellation element based on Mie scattering and Brownian movement according to claim 1 is characterized in that: described insulating particles (402) adopt polystyrene microsphere or TiO 2 particles.
5. the speckle cancellation element based on Mie scattering and Brownian movement according to claim 1 is characterized in that: transmission exit facet (303) surface of enclosed optical reflection cavity (302) is provided with the anti-reflection film with incident laser (101) wave band coupling.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110031499 CN102073145A (en) | 2011-01-29 | 2011-01-29 | Speckle elimination device based on Mie scattering and Brownian motion |
| PCT/CN2012/000039 WO2012100640A1 (en) | 2011-01-29 | 2012-01-10 | Speckle removal device based on mie scattering and brownian motion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110031499 CN102073145A (en) | 2011-01-29 | 2011-01-29 | Speckle elimination device based on Mie scattering and Brownian motion |
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| CN102073145A true CN102073145A (en) | 2011-05-25 |
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| CN 201110031499 Pending CN102073145A (en) | 2011-01-29 | 2011-01-29 | Speckle elimination device based on Mie scattering and Brownian motion |
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| WO (1) | WO2012100640A1 (en) |
Cited By (5)
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| WO2012100640A1 (en) * | 2011-01-29 | 2012-08-02 | 中北大学 | Speckle removal device based on mie scattering and brownian motion |
| CN108152989A (en) * | 2017-12-20 | 2018-06-12 | 山西大学 | A kind of dissipation spot device and method based on Brownian movement and hollow-core fiber |
| CN111272110A (en) * | 2020-03-04 | 2020-06-12 | 上海交通大学 | Multiple scattering transmitted light angle distribution measuring device based on thin plate medium |
| CN111929756A (en) * | 2020-08-20 | 2020-11-13 | 惠州视维新技术有限公司 | Diffusion sheet and preparation method thereof, direct type backlight module and display device |
| CN114839790A (en) * | 2022-05-23 | 2022-08-02 | 上海交通大学 | Laser decoherence method based on Brownian-like motion model |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2012100640A1 (en) * | 2011-01-29 | 2012-08-02 | 中北大学 | Speckle removal device based on mie scattering and brownian motion |
| CN108152989A (en) * | 2017-12-20 | 2018-06-12 | 山西大学 | A kind of dissipation spot device and method based on Brownian movement and hollow-core fiber |
| CN108152989B (en) * | 2017-12-20 | 2020-09-29 | 山西大学 | Speckle dissipation device and method based on Brownian motion and hollow optical fiber |
| CN111272110A (en) * | 2020-03-04 | 2020-06-12 | 上海交通大学 | Multiple scattering transmitted light angle distribution measuring device based on thin plate medium |
| CN111272110B (en) * | 2020-03-04 | 2021-08-10 | 上海交通大学 | Multiple scattering transmitted light angle distribution measuring device based on thin plate medium |
| CN111929756A (en) * | 2020-08-20 | 2020-11-13 | 惠州视维新技术有限公司 | Diffusion sheet and preparation method thereof, direct type backlight module and display device |
| CN114839790A (en) * | 2022-05-23 | 2022-08-02 | 上海交通大学 | Laser decoherence method based on Brownian-like motion model |
| CN114839790B (en) * | 2022-05-23 | 2023-06-16 | 上海交通大学 | Laser decoherence method based on Brownian motion-like model |
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| WO2012100640A1 (en) | 2012-08-02 |
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Application publication date: 20110525 |