CN202075498U - Speckle eliminating device based on Mie scattering and perturbation driving - Google Patents
Speckle eliminating device based on Mie scattering and perturbation driving Download PDFInfo
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- CN202075498U CN202075498U CN2011200307844U CN201120030784U CN202075498U CN 202075498 U CN202075498 U CN 202075498U CN 2011200307844 U CN2011200307844 U CN 2011200307844U CN 201120030784 U CN201120030784 U CN 201120030784U CN 202075498 U CN202075498 U CN 202075498U
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Abstract
The utility model relates to the field of display technology which uses the coherent light as the light source, and specifically relates to a speckle eliminating device based on the Mie scattering and the perturbation driving. The speckle eliminating device solves the problems of poor speckle eliminating effect, complex realization structure, vulnerableness, and high cost of a conventional speckle eliminating method. The speckle eliminating device includes an optical reflection cavity which is provided with an incident light coupling device and a transmission emitting surface, and an optical device. The optical device is arranged just opposite to the incident light coupling device of the optical reflection cavity. The inner walls of the optical reflection cavity except for the transmission emitting surface are all the mirror surface inner walls. The optical reflection cavity is provided with a transparent substance which fills with the whole optical reflection cavity, and the transparent substance is scattered with medium particles which can use the dimension to make the incident laser generate the Mie scattering. The optical reflection cavity and the optical device are provided with a perturbation sensitive device respectively, or one of them is provided with the perturbation sensitive device. The speckle eliminating device based on the Mie scattering and the perturbation driving is reasonable and compact in structure, easy to realize, low in cost, excellent in speckle eliminating effect, high in laser utilization rate, and stable in performance. Besides, the speckle eliminating device is safe and reliable, and has the dodging function.
Description
Technical field
It is the display technique field of light source that the utility model relates to the coherent light, specifically be a kind of speckle cancellation element, be primarily aimed at the optics speckle phenomena that exists in laser display technology and the optical instrument based on Mie scattering and perturbation (referring generally to weak vibration) driving.
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, result's speckle contrast is 70%, does not almost play the effect that reduces speckle.
Summary of the invention
The utility model is for problems such as the elimination speckle poor effect that solves existing speckle removing method and exist, implementation structure complexity, fragile, cost height, and a kind of speckle cancellation element that drives based on Mie scattering and perturbation is provided.
The utility model is to adopt following technical scheme to realize: based on the speckle cancellation element of Mie scattering and perturbation driving, comprise the optical reflection chamber which is provided with incident light coupling device and transmission exit facet, the optical device that is used to realize the laser beam incident optical reflection cavity, optical device is provided with over against the incident light coupling device in optical reflection chamber; It (is that inwall has the high reflectance characteristic that the inwall of optical reflection chamber 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 provided with the transparency material that fills up whole optics reflection cavity in the optical reflection chamber, and be scattered with the insulating particles that its dimension can cause incident laser generation Mie scattering in the transparency material; Optical reflection chamber and optical device respectively or only one are equipped with the perturbation sensor of the incident state (comprising incident angle, incoming position, incident light path etc.) when being used for responsive extraneous perturbation and servo-actuated and changing light beam beam incident optical reflection cavity incident light coupling device.Described extraneous perturbation can be environment micro-turbulence (as: radiator fan in the system), and perhaps the perturbation generation device (as: piezoelectricity microseism perturbation equipment) that is provided with by special use provides.
Described perturbation sensor can adopt multiple structure to realize, is easily for a person skilled in the art, for example: adopt cantilever beam structure realization or Microspring etc.;
Described optical device can adopt catoptron, scanning micro-mirror or optical lens;
Described transparency material is the transparent solid matter that incident laser is not had transmission loss, as: high-molecular gel; Perhaps be solution or colloidal sol, described solution is organic solution or inorganic solution; Described colloidal sol is gasoloid or lyosol.
During application, as shown in Figure 3, incide in the transparency material 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 the transparency material (as shown in Figure 2, 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 transparency material 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 the setting of perturbation sensor, make optical reflection chamber and optical device can be responsive to extraneous perturbation and servo-actuated takes place, and then the continuously changing of incident state (comprising incident angle, incoming position, incident light path etc.) when causing light beam beam incident optical reflection cavity, the scattered light of incident laser can the randomly changing direction of propagation and path in transparency material 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, the utility model adopts the optical reflection chamber of built-in transparency material, the insulating particles that scatter in transparency material in the optical reflection chamber cause incident laser generation Mie scattering, carry out the scattering beam splitting, and the perturbation sensor is set, the incident state continuously changes when making extraneous perturbation energy cause light beam beam incident optical reflection cavity, the direction of propagation and the path of randomly changing scattered beam in the optical reflection chamber, reduce the incident laser spatial coherence, make 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 described in the utility model after, the speckle contrast of image can be lower than 4%, the speckle contrast of image is 3.98%, speckle is eliminated works very well; Wherein, the extraneous micron order disturbance that produces can trigger the perturbation sensor, and for example: the vibrations of common projector fan can be satisfied required perturbation amplitude and the frequency requirement of triggering perturbation sensor; And can improve speckle by the concentration that improves extraneous perturbation intensity, transparency material medium particle and eliminate effect; The utility model 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 utility model is very common, and transparency material also need not select special material, has the advantage of low cost.
The utility model 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 is a structural representation of the present utility model;
Fig. 2 is the light intensity angle distribution plan of Mie scattering;
Fig. 3 is the transmission state synoptic diagram of device inner light beam described in the utility model;
Fig. 4 is the application synoptic diagram of device described in the utility model in the spot scan display system;
Fig. 5 is the application synoptic diagram of device described in the utility model 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-optical reflection chamber; 303-transmission exit facet; The 304-entrance pupil; 305,306,307-speckle cancellation element; The 308-optical device;
401-solution or colloidal sol; The 402-insulating particles;
501,502,503-laser instrument; 504,505,506-mirror;
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 1, speckle cancellation element based on Mie scattering and perturbation driving, comprise the optical reflection chamber 302 which is provided with incident light coupling device 301 and transmission exit facet 303, the optical device 308 that is used to realize laser beam incident optical reflection cavity 302, optical device 308 is provided with over against the incident light coupling device 301 in optical reflection chamber 302; It (is that inwall has the high reflectance characteristic that the inwall of optical reflection chamber 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 302), be provided with the transparency material 401 that fills up whole optics reflection cavity 302 in the optical reflection chamber 302, and be scattered with the insulating particles 402 that its dimension can cause incident laser generation Mie scattering in the transparency material 401; Optical reflection chamber 302 and optical device 308 respectively or only one are equipped with the perturbation sensor (accompanying drawing does not draw specially) of the incident state (comprising incident angle, incoming position, incident light path etc.) when being used for responsive extraneous perturbation and servo-actuated and changing light beam beam incident optical reflection cavity 302 incident light coupling devices 301.
Described perturbation sensor can adopt multiple structure to realize, is easily for a person skilled in the art, for example: adopt cantilever beam structure realization or Microspring etc.;
Described optical device 308 can adopt catoptron, scanning micro-mirror or optical lens;
Described transparency material 402 is the transparent solid matter that incident laser is not had transmission loss, as: high-molecular gel; Perhaps be solution or colloidal sol, described solution is organic solution or inorganic solution; Described colloidal sol is gasoloid or lyosol;
During concrete enforcement, described insulating particles 402 can adopt polystyrene microsphere, TiO 2 particles (TiO
2) wait insulating particles; Described optical reflection chamber 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 in optical reflection chamber 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 the incident laser wave band;
Incident light coupling device 301 on the described optical reflection chamber 302 can be realized by following structure: adopt the transmission plane of incidence, and be provided with the anti-reflection film that mates with the incident beam wave band on the surface; Perhaps adopting the entrance pupil structure, is solution or colloidal sol as transparency material 401 in the optical reflection chamber 302, then need set optical coupling element (as: lens) on entrance pupil 304, so that form the enclosed optical reflection cavity.
Speckle cancellation element described in the utility model can be applied in the laser projection display technology, for example: as shown in Figure 4, 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 are derived in exit facet after modulating by mirror 504,505,506 coupling incidents speckle cancellation element 300 described in the utility model, and scioptics 700 and micro scanning mirror (Scan Mirror) 701 projects to screen 800.Under the driving of electric signal, micro scanning mirror 701 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 5, 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 described in the utility model 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 (6)
1. speckle cancellation element that drives based on Mie scattering and perturbation, it is characterized in that: comprise the optical reflection chamber (302) which is provided with incident light coupling device (301) and transmission exit facet (303), the optical device (308) that is used to realize laser beam incident optical reflection cavity (302), optical device (308) is provided with over against the incident light coupling device (301) of optical reflection chamber (302); The inwall of optical reflection chamber (302) except that transmission exit facet (303) inwall is all " minute surface " inwall, be provided with the transparency material (401) that fills up whole optics reflection cavity (302) in the optical reflection chamber (302), and be scattered with the insulating particles (402) that its dimension can cause incident laser generation Mie scattering in the transparency material (401); Optical reflection chamber (302) and optical device (308) respectively or only one are equipped with the perturbation sensor of the incident state when being used for responsive extraneous perturbation and servo-actuated and changing light beam beam incident optical reflection cavity (302) incident light coupling device (301).
2. the speckle cancellation element based on Mie scattering and perturbation driving according to claim 1, it is characterized in that: described optical device (308) adopts catoptron or scanning micro-mirror or optical lens.
3. the speckle cancellation element based on Mie scattering and perturbation driving according to claim 1 is characterized in that: described transparency material (401) is not for there being the transparent solid matter of transmission loss to incident laser.
4. the speckle cancellation element based on Mie scattering and perturbation driving according to claim 1, it is characterized in that: described transparency material (401) is solution or colloidal sol, and described solution is organic solution or inorganic solution; Described colloidal sol is gasoloid or lyosol.
5. the speckle cancellation element based on Mie scattering and perturbation driving according to claim 1, it is characterized in that: described insulating particles (402) adopt polystyrene microsphere or TiO 2 particles.
6. the speckle cancellation element based on Mie scattering and perturbation driving according to claim 1, it is characterized in that: transmission exit facet (303) surface of optical reflection chamber (302) is provided with the anti-reflection film with incident laser wave band coupling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200307844U CN202075498U (en) | 2011-01-29 | 2011-01-29 | Speckle eliminating device based on Mie scattering and perturbation driving |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200307844U CN202075498U (en) | 2011-01-29 | 2011-01-29 | Speckle eliminating device based on Mie scattering and perturbation driving |
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| CN202075498U true CN202075498U (en) | 2011-12-14 |
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| CN2011200307844U Expired - Lifetime CN202075498U (en) | 2011-01-29 | 2011-01-29 | Speckle eliminating device based on Mie scattering and perturbation driving |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053383A (en) * | 2011-01-29 | 2011-05-11 | 中北大学 | Speckle eliminating device based on Mie scatter and perturbation drive |
| WO2012100643A1 (en) * | 2011-01-29 | 2012-08-02 | 中北大学 | Speckle removal device based on mie scattering and optical part |
-
2011
- 2011-01-29 CN CN2011200307844U patent/CN202075498U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053383A (en) * | 2011-01-29 | 2011-05-11 | 中北大学 | Speckle eliminating device based on Mie scatter and perturbation drive |
| WO2012100645A1 (en) * | 2011-01-29 | 2012-08-02 | 中北大学 | Speckle removal device based on mie scattering and perturbation drive |
| WO2012100643A1 (en) * | 2011-01-29 | 2012-08-02 | 中北大学 | Speckle removal device based on mie scattering and optical part |
| US10078229B2 (en) | 2011-01-29 | 2018-09-18 | North University Of China | Speckle reduction apparatus based on Mie scattering, perturbation drive, and optical reflective chamber |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Xia Yun Inventor after: Chen Xuyuan Inventor after: Gao Wenhong Inventor after: Shi Yunbo Inventor after: Xu Meifang Inventor before: Chen Xuyuan Inventor before: Gao Wenhong Inventor before: Shi Yunbo Inventor before: Xu Meifang |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: CHEN XUYUAN GAO WENHONG SHI YUNBO XU MEIFANG TO: XIA YUN CHEN XUYUAN GAO WENHONG SHI YUNBO XU MEIFANG |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20111214 Effective date of abandoning: 20120926 |