CN105093559A - Decoherence apparatus - Google Patents
Decoherence apparatus Download PDFInfo
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- CN105093559A CN105093559A CN201410205988.5A CN201410205988A CN105093559A CN 105093559 A CN105093559 A CN 105093559A CN 201410205988 A CN201410205988 A CN 201410205988A CN 105093559 A CN105093559 A CN 105093559A
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- liquid
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- eliminating coherence
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Abstract
The invention discloses a decoherence apparatus. The apparatus comprises a liquid storage container, a heating plate, and a heat radiation plate, and the front wall and the rear wall of the liquid storage container are light transmission plates. Local liquid in the liquid storage container is heated by employing waste heat generated by the operation of a laser, and other parts of the liquid storage container are cooled by the heat radiation plate so that a temperature difference is formed in the container, the temperature of the liquid in the liquid storage container rises due to the convection effect, the liquid rises and pulls surrounding liquid for supplement, and the liquid generates oriented circulation flow in a sealed circulation loop; and laser passes through the liquid flowing in a circulation manner with non-uniform temperature, the phase generates random change, and the decoherence effect is achieved. According to the decoherence apparatus, the design is simple, the cost is low, and the decoherence effect is ideal.
Description
Technical field
The present invention relates to technical field of laser display, more specifically relate to a kind of eliminating coherence device.
Background technology
Laser display has the advantages such as colour gamut covers extensively, high, the two high definition of color saturation, high brightness, becomes display technique trend of future generation gradually.The principle of laser display is: image is shown on screen respectively through processes such as shaping, shimming, eliminating coherence, modulation, projections by red, green, blue tricolor laser.Because laser has high coherence, obvious speckle can be produced if directly projected a laser onto on screen, affect image quality.Therefore laser has to pass through eliminating coherence process and just can be applied to laser display.The normal eliminating coherence method used has vibrations screen, vibrations optical mirror slip, rotating wave plate etc., rotates diffuse reflector etc. at present, but these method design realize comparatively complicated, and cost is higher, the practical requirement of discontented foot.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is the process how simplifying eliminating coherence, reduces costs, and improves eliminating coherence effect.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of eliminating coherence device, described eliminating coherence device comprises liquid storage container, heating plate, heat sink; Described heat vessel comprises cavity, front light-passing board and rear light-passing board;
Described liquid storage container is equipped with the actuating medium of transparent liquid, and the actuating medium of described transparent liquid is operated in liquid condition; Described heating plate is positioned at described cavity bottom or side; Described heat sink is positioned at described cavity top or side.
Transparent operation medium in liquid storage container can be water, ethanol, methyl alcohol, phenixin etc. but be not limited to the liquid of illustrating, and also can be the potpourri of several transparency liquid and adds suspension or the emulsion of other material.Actuating medium in liquid storage container can produce convection action when there is temperature difference, and the part of instant heating can rise, and cold part can decline, thus the heat of liquid internal is exchanged.On the one hand the refractive index of liquid and the density of liquid about, another aspect refractive index along with the change of temperature also can change.The temperature refraction rate coefficient of such as ethanol is 4 × 10
-4, namely ethanol temperature often changes 1 DEG C, the variations in refractive index 4 × 10 of ethanol
-4.Suppose that the thickness of ethanol is 1cm, the optical path difference change that so temperature variation 1 DEG C produces is equivalent to 6 times of red light wavelength the longest in three primary colours.The temperature variation that such liquid internal is small just can make to produce considerable change by laser phase wherein.The used heat utilizing laser instrument to produce heats container localized liquid, dispel the heat at other positions of container, thus make to produce temperature difference in container, transparency liquid wherein produces directed flow due to convection action, and the liquid so with different temperatures constantly will mix in container.Because this process has randomness, so a certain position temperature will change in certain scope in container, laser also can produce random change by phase place after liquid, and the phase place of light field is upset, and so just can reduce or eliminate the coherence of the laser by liquid.
Preferably, light field homogenizer is increased before described front light-passing board; The light field of the increase below homogenizer of described rear light-passing board.
Preferably, the overall transmitance of actuating medium in visible light wave range of described transparent liquid is greater than 80%, and adds antiseptic and prevent microbial growth.
Preferably, the material of described heating plate and described heat sink is high thermal conductivity material.
Preferably, described heat sink is at least 1, is connected with outside heat sinks by semiconductor chilling plate or high thermal conductivity material; Described heating plate is at least 1, by semiconductor chilling plate or high thermal conductivity material and laser instrument waste heat source or external heating equipment connection.
Preferably, described heat vessel is hermetically-sealed construction, and the material of described cavity is low thermal conductivity material or thermal insulation material.
Preferably, described front light-passing board and described rear light-passing board material are the transparent material being greater than 80% to the overall transmitance in visible light wave range, and are coated with anti-reflection film or diaphragm.
Preferably, described eliminating coherence device also comprises return, and described return and described liquid storage container form a closed closed circuit, actuating medium directed flow in closed circuit of described transparent liquid.
Preferably, described return material is low thermal conductivity material or thermal insulation material.
Preferably, described return also comprises Miniature liquid pump, for strengthening the convection current of the actuating medium of described transparent liquid.
(3) beneficial effect
The invention provides a kind of eliminating coherence device, this device realizes the eliminating coherence of laser by the convection current that liquid produces due to temperature difference in liquid storage container, partly even all can eliminate the relevant effect of laser, and design of the present invention and realization are simply, practical.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of eliminating coherence device of a preferred embodiment of the present invention;
Fig. 2 is the structural representation of a kind of eliminating coherence device of another preferred embodiment of the present invention;
Fig. 3 is the structural representation of a kind of eliminating coherence device of another preferred embodiment of the present invention;
Fig. 4 is the structural representation of a kind of eliminating coherence device of another preferred embodiment of the present invention.
Marginal data:
1, cavity; 2, heating plate; 3, heat sink; 4, light-passing board; 5, light-passing board; 6, return; 7, semiconductor laser; 8, lenticule; 9, Miniature liquid pump.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Following examples for illustration of the present invention, but can not be used for limiting the scope of the invention.
A kind of eliminating coherence device of the present invention comprises a liquid storage container, and its inside is full of transparent operation medium.
Liquid storage container comprises cavity, front light-passing board, rear light-passing board; Cavity is made by low thermal conductivity material, light-passing board by light transmissive material as optical glass is made, for transmission laser; Front light-passing board and rear light-passing board all can plate anti-reflection film or plate other diaphragm according to liquid property, all can be made into the lens with certain function; Light field homogenizer can be increased before described front light-passing board; Light field homogenizer can be increased after described rear light-passing board.The cavity of liquid storage container adds projection in the place not affecting light path, and particle etc. strengthen the randomness of liquid flow.The Main Function of liquid storage container is that the convection action that the transparent operation medium of its inside is produced by the temperature difference in container forms directed flow thus makes through laser phase random variation wherein.
Eliminating coherence device of the present invention also comprises heating plate, described heating plate can as a part for liquid storage container wall, also can as one independently structure be connected with liquid storage container by pipeline, for heating localized liquid in liquid storage container, directly can utilize the used heat of laser instrument, also can use external heating equipment; Described heating plate is positioned at bottom or the side of liquid storage container cavity, with laser instrument waste heat source or external heating equipment connection, and at least 1 piece.
Eliminating coherence device of the present invention also comprises heat sink, described heat sink can as a part for liquid storage container wall, also can as one independently structure be connected with liquid storage container by pipeline, for dispelling the heat to the localized liquid in container, external radiating device can be fan, TEC cooling piece etc.; Described heat sink is positioned at top or the side of liquid storage container cavity, is connected, at least 1 piece with outside heat sinks.
A kind of eliminating coherence device of the present invention can increase return, and return and liquid storage container form a closed closed circuit, and transparency liquid is qualitative flowing in closed circuit, can arrange one or more Miniature liquid pump and add strong convection in described return.
A kind of eliminating coherence device of the present invention uses lower thermal conductivity or thermal insulation material to make return, the wall of liquid storage container except light-passing board, heating plate, heat sink.
Fig. 1 is the structural representation of a kind of eliminating coherence device of a preferred embodiment of the present invention; A kind of eliminating coherence device of the present embodiment comprises: liquid storage container, heating plate 2, heat sink 3; Described heat vessel comprises cavity 1, front light-passing board 4 and rear light-passing board 5.Wherein heating plate 2 material is red copper, and its thermal source can be the used heat that laser instrument produces also can be external heating equipment.The passage of heat that heating plate 2 is formed by red copper is connected with laser instrument waste heat source.Heat sink 3 material is red copper, and the passage of heat formed by red copper is connected with outside heat sinks.Front light-passing board 4 and the rear parallel placement of light-passing board 5, its material optical glass is made, and is of a size of 50mm × 50mm, can be that plane also can make the lens with certain function according to specific needs, in order to increase the transmitance of light-passing board, anti-reflection film can be plated in its surface.Distance between two light-passing boards can adjust according to concrete service condition.Liquid storage container other cavity except front light-passing board 4, rear light-passing board 5, heating plate 2, heat sink 3 uses polytetrafluoroethylmaterial material to make, and reduces the loss of heat on wall.Liquid storage container is closed structure, and the encapsulants such as O-ring seal, silicon rubber, glass cement, raw material band can be used to be connected with other seal parts of container at heating plate 2, heat sink 3, front light-passing board 4 and rear light-passing board 5.Transparency liquid in liquid storage container adopts pure water, and adds thimerosal and prevent microbial growth.
When laser works, its used heat produced reaches heating plate 2 by the passage of heat that red copper is formed.Also heating plate 2 can be heated while for laser instrument heat radiation like this.Heating plate 2 is on the bottom cavity or side cavity of liquid storage container, and after absorbing the heat from laser instrument, temperature rises simultaneously to the heating liquid bottom liquid storage container.Liquid bottom liquid storage container flows to the top of container because temperature rises.On the top of liquid storage container, the temperature of liquid cools by heat sink 3, thus keeps poor with container bottom stationary temperature.Container bottom can be supplemented by liquid around in container due to the liquid minimizing that causes compared with the rising of hot liquid, thus defines circulating of " middle rise-decline " around.In such liquid storage container, cold and hot liquids constantly mixes, the fluid temperature random variation within the specific limits of a certain position, and laser, being changed at random through phase place during the liquid flowed by light-passing board, reaches the object reducing or eliminate relevant effect.
Heating plate and heat sink as a part for liquid storage container, also can be made independently structure and be connected by pipeline in the unallowed situation in space.
Fig. 2 is the structural representation of a kind of eliminating coherence device of another preferred embodiment of the present invention.Compared with the embodiment shown in Fig. 1, embodiment adds return 6, be made up of engineering plastic materials, outside is surrounded by insulating material as foams plastic material, and transparency liquid selects ethanol, directed flow in the closed circuit that liquid storage container and return form.Front light-passing board 4 and rear light-passing board 5 adopt quartz glass to make, and are of a size of 50mm × 50mm.Be connected by semiconductor chilling plate (TEC) between heating plate 2 with laser instrument waste heat source, heat sink 3 is also connected by TEC with between outside heat sinks.
Embodiment
In the present embodiment, the return 6 that connects cavity 1 upper and lower of liquid storage container is added.The used heat that heating plate 2 produces from laser instrument absorbs heat heats liquid storage container bottom by TEC, to be cooled thus keep the upper and lower stationary temperature of liquid storage container poor at the heat sink 3 of the upper chamber of liquid storage container by TEC to upper liquid.Due to convection action heated liquid temperature raise after rise, the liquid in traction pipeline supplements, thus the directed flow in the closed circuit that transparency liquid is formed at liquid storage container and return 6.In such liquid storage container, cold and hot liquids constantly mixes, the fluid temperature random variation within the specific limits of a certain position, and laser, being changed at random through phase place during the liquid flowed by light-passing board, reaches the object reducing or eliminate coherence.
Fig. 3 is the structural representation of a kind of eliminating coherence device of another preferred embodiment of the present invention.Compared with embodiment illustrated in fig. 2, together with the heating plate 2 in the present embodiment and semiconductor laser (bar bar) 7 heat sink is combined into, the transparency liquid namely in pipeline flows through the heat sink of bar bar 7; Transparent liquid actuating medium selects methyl alcohol; Front light-passing board 4 and rear light-passing board 5 adopt calcium fluoride material, and surface is coated with visible light wave range broadband anti-reflection film.When bar bar 7 works, its heat produced by heat sink also namely heating plate 2 absorb, to the transparency liquid heating in pipeline; And dispelled the heat by TEC at the heat sink 3 of the upper chamber of liquid storage container, thus keep the upper and lower stationary temperature of liquid storage container poor, heated liquid temperature due to convection action duct bottom raises and can flow to the liquid storage container top that temperature is lower, liquid in traction pipeline supplements, thus directed flow in the closed circuit that transparency liquid is formed at liquid storage container and return 6.In such liquid storage container, cold and hot liquids constantly mixes, the fluid temperature random variation within the specific limits of a certain position, and laser, being changed at random through phase place during the liquid flowed by light-passing board, reaches the object reducing or eliminate coherence.
Fig. 4 is the structural representation of a kind of eliminating coherence device of another preferred embodiment of the present invention.Compared with embodiment illustrated in fig. 3, the present embodiment is before front light-passing board 4, and rear light-passing board 5 adds lenticule 8 light field homogenizer below, adds Miniature liquid pump 9 to add strong convection in return; Transparent liquid actuating medium selects phenixin; Front light-passing board 4 and rear light-passing board 5 adopt K9 glass material, and surface is coated with diaphragm.When bar bar 7 works, its heat produced by heat sink also namely heating plate 2 absorb, to the transparency liquid heating in pipeline; And dispelled the heat by TEC at the heat sink 3 of the upper chamber of liquid storage container, thus keep the upper and lower stationary temperature of liquid storage container poor, heated liquid temperature due to convection action duct bottom raises and can flow to the liquid storage container top that temperature is lower, liquid in traction pipeline supplements, simultaneously Miniature liquid pump 9 carries out pumping in the direction identical with transparency liquid flow direction, thus the directed flow in the closed circuit that transparency liquid is formed at liquid storage container and return 6.In such liquid storage container, cold and hot liquids constantly mixes, the fluid temperature random variation within the specific limits of a certain position, and laser, being changed at random through phase place during the liquid flowed by light-passing board, reaches the object reducing or eliminate coherence.Lenticule 8 plays the effect to light field homogenize, and this device can not only play and eliminate the effect of laser coherence like this, can also the light field of homogenize simultaneously, makes whole laser display system compacter.
When the used heat that laser instrument produces is inadequate, also can increases extra external heating equipment and heating plate 2 is heated.In order to strengthen eliminating coherence effect, the randomness that projection pockety or burr strengthen liquid distribution is made in the place can not affecting light path at liquid storage container inwall.
In above-mentioned four embodiments, although be only be provided with a heating plate and a heat sink, but multiple heating plate and heat sink can arranged according to actual conditions and result of use completely in actual use, wherein heating plate is positioned at bottom or the side of cavity or return, and heat sink is positioned at top or the side of cavity or return.
Above embodiment is only for illustration of the present invention, but not limitation of the present invention.Although with reference to embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, various combination, amendment or equivalent replacement are carried out to technical scheme of the present invention, do not depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of right of the present invention.
Claims (10)
1. an eliminating coherence device, is characterized in that, described eliminating coherence device comprises liquid storage container, heating plate, heat sink; Described heat vessel comprises cavity, front light-passing board and rear light-passing board;
Described liquid storage container is equipped with the actuating medium of transparent liquid, and the actuating medium of described transparent liquid is operated in liquid condition; Described heating plate is positioned at described cavity bottom or side; Described heat sink is positioned at described cavity top or side.
2. eliminating coherence device according to claim 1, is characterized in that, increases light field homogenizer before described front light-passing board; The light field of the increase below homogenizer of described rear light-passing board.
3. eliminating coherence device according to claim 1, is characterized in that, the overall transmitance of actuating medium in visible light wave range of described transparent liquid is greater than 80%, and adds antiseptic and prevent microbial growth.
4. eliminating coherence device according to claim 1, is characterized in that, the material of described heating plate and described heat sink is high thermal conductivity material.
5. eliminating coherence device according to claim 1, is characterized in that, described heat sink is at least 1, is connected with outside heat sinks by semiconductor chilling plate or high thermal conductivity material; Described heating plate is at least 1, by semiconductor chilling plate or high thermal conductivity material and laser instrument waste heat source or external heating equipment connection.
6. eliminating coherence device according to claim 1, is characterized in that, described heat vessel is hermetically-sealed construction, and the material of described cavity is low thermal conductivity material or thermal insulation material.
7. eliminating coherence device according to claim 1, is characterized in that, described front light-passing board and described rear light-passing board material are the transparent material being greater than 80% to the overall transmitance in visible light wave range, and are coated with anti-reflection film or diaphragm.
8. eliminating coherence device according to claim 1, it is characterized in that, described eliminating coherence device also comprises return, and described return and described liquid storage container form a closed closed circuit, actuating medium directed flow in closed circuit of described transparent liquid.
9. eliminating coherence device according to claim 8, is characterized in that, described return material is low thermal conductivity material or thermal insulation material.
10. eliminating coherence device according to claim 8, is characterized in that, described return also comprises Miniature liquid pump, for strengthening the convection current of the actuating medium of described transparent liquid.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410205988.5A CN105093559B (en) | 2014-05-15 | 2014-05-15 | A kind of eliminating coherence device |
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| CN201410205988.5A CN105093559B (en) | 2014-05-15 | 2014-05-15 | A kind of eliminating coherence device |
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| CN105093559B CN105093559B (en) | 2017-07-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112631055A (en) * | 2020-12-25 | 2021-04-09 | 四川长虹电器股份有限公司 | Solid-liquid dual-state speckle eliminating device and laser projection light source |
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| CN101593924A (en) * | 2008-05-28 | 2009-12-02 | 北京中视中科光电技术有限公司 | A kind of eliminating coherence device |
| CN101950087A (en) * | 2010-08-20 | 2011-01-19 | 福州高意通讯有限公司 | Method for eliminating laser speckle effect |
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2014
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Patent Citations (5)
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| CN1879057A (en) * | 2004-04-09 | 2006-12-13 | 松下电器产业株式会社 | Laser image display |
| WO2006024998A2 (en) * | 2004-08-30 | 2006-03-09 | Koninklijke Philips Electronics N.V. | A laser projection system |
| CN201133971Y (en) * | 2007-12-26 | 2008-10-15 | 北京中视中科光电技术有限公司 | Device and apparatus for eliminating laser display speckle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112631055A (en) * | 2020-12-25 | 2021-04-09 | 四川长虹电器股份有限公司 | Solid-liquid dual-state speckle eliminating device and laser projection light source |
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| CN105093559B (en) | 2017-07-28 |
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