CN102801470B - Flashlight emitter and optical communication system - Google Patents
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- CN102801470B CN102801470B CN201210011281.1A CN201210011281A CN102801470B CN 102801470 B CN102801470 B CN 102801470B CN 201210011281 A CN201210011281 A CN 201210011281A CN 102801470 B CN102801470 B CN 102801470B
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- 238000009792 diffusion process Methods 0.000 claims description 4
- 230000000737 periodic effect Effects 0.000 claims description 3
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- 230000005281 excited state Effects 0.000 abstract description 2
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Abstract
The present invention proposes a kind of flashlight emitter and optical communication system.This flashlight emitter comprises excitaton source for launching exciting light and Wavelength converter, and this Wavelength converter comprises for receiving exciting light and launching the wavelength conversion sheet of Stimulated Light and the drive unit for driving this wavelength conversion sheet to move along predetermined path of movement relative to exciting light.This flashlight emitter also comprises control device, for controlling power or the switch of exciting light, and/or control exciting light is irradiated to the switching of hot spot between the different predetermined path of movement of wavelength conversion sheet that wavelength conversion sheet is formed, the attribute of the Stimulated Light that flashlight emitter is sent or the mixed light of Stimulated Light and exciting light changes to form flashlight.Flashlight emitter of the present invention and optical communication system, utilize excitation Wavelength converter, and the change of excited state forms the flashlight being applicable to long range propagation to human eye fanout free region.
Description
Technical field
The present invention relates to optical communication field, particularly relate to flashlight emitter and utilize this flashlight emitter to transmit the optical communication system of light.
Background technology
Closely the optical communication of free space is more and more valued by the people because its facility is simple, with low cost.US Patent No. 20110164884 and Chinese patent CN102090148 individually disclose a kind of device and system of visible light communication.
The flashlight emitter of current this optical communication system has two kinds of selections, is laser diode (LD, laserdiode) and light-emitting diode (LED, lightemittingdiode) respectively.But these two kinds of light sources have the shortcoming of oneself respectively: the advantage of laser diode is that light intensity is comparatively large, and this is conducive to long distance signal transmission, and shortcoming is that directivity is excessively strong, and irradiation range is little, therefore requires that the placement location of receiving system is very accurate; Laser has injury to human eye simultaneously, and danger is higher.The advantage of light-emitting diode is not injure human eye, and shortcoming is that its brightness is lower, and luminescence comparatively disperses, and is unfavorable for long range propagation.
Therefore, a kind of flashlight emitter being applicable to long range propagation to human eye fanout free region is needed.
Summary of the invention
The technical problem underlying that the present invention solves proposes a kind of flashlight emitter being applicable to long range propagation to human eye fanout free region, and apply the optical communication system of this flashlight emitter.
The present invention proposes a kind of flashlight emitter, be applied to optical communication system, comprise the excitaton source for launching exciting light and Wavelength converter, this Wavelength converter comprise for receive exciting light and launch Stimulated Light wavelength conversion sheet and for driving this wavelength conversion sheet relative to the drive unit of exciting light along predetermined path of movement periodic relative motion.This flashlight emitter also comprises control device, for controlling power or the switch of exciting light, and/or control exciting light is irradiated to the switching of hot spot between the different predetermined path of movement of this hot spot relative to this wavelength conversion sheet that wavelength conversion sheet is formed, this different predetermined path of movement has different wavelength convert attributes, and the attribute of the Stimulated Light that flashlight emitter is sent or the mixed light of Stimulated Light and exciting light changes to form flashlight; Also comprise light projecting apparatus, for collecting and superframe signal light.
The present invention also proposes a kind of optical communication system, comprise the above-mentioned flashlight emitter for the light that transmits, with the flashlight receiving system for receiving this flashlight, the flashlight of different attribute can be converted to the different signals of telecommunication by this flashlight receiving system.
In flashlight emitter of the present invention and optical communication system, utilize excitation Wavelength converter, and the change of excited state is to form the flashlight being applicable to long range propagation to human eye fanout free region.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the first embodiment of the present invention;
Fig. 1 a is the front view of the wavelength conversion sheet of first embodiment of the invention;
Fig. 1 b and Fig. 1 c is time dependent two citings of the state of excitaton source in the first embodiment;
Fig. 1 d is the relation schematic diagram between signal light intensity and excitaton source drive current;
Fig. 2 is the schematic diagram of the second embodiment of the present invention;
Fig. 3 is the front view of the wavelength conversion sheet of the third embodiment of the present invention;
Fig. 4 a and 4b is the schematic diagram of the possible structure of two kinds of the third embodiment of the present invention;
Fig. 5 is the structural representation of the fourth embodiment of the present invention;
Fig. 5 a is the front view of the wavelength conversion sheet of the fourth embodiment of the present invention;
Fig. 6 is the structural representation of the fifth embodiment of the present invention.
Fig. 7 is the front view of the citing of another kind of wavelength conversion sheet of the present invention.
Embodiment
The structure of the flashlight emitter of the first embodiment of the present invention as shown in Figure 1.In flashlight emitter 100, comprise the excitaton source 101 for launching exciting light 111, and Wavelength converter, this Wavelength converter is made up of the wavelength conversion sheet 103 be mutually permanently connected and drive unit 105.Wherein wavelength conversion sheet 103 is for receiving exciting light 111 and launching Stimulated Light, and its front view as shown in Figure 1a.
The profile of wavelength conversion sheet 103 is processed to circle, comprises along the circumferential direction equally distributed region 141 above, this region 141 comprises material for transformation of wave length.Multi-wavelength's transition material is had to select, such as fluorescent material, fluorescent dye or quantum dot etc., the preferred material that fluorescent material becomes wherein owing to developing the most ripe, such as YAG:Ce fluorescent material.In the application scenario that some are special, wish that the flashlight that flashlight emitter 100 is launched is invisible light, can avoid like this, to the visual interference of people, now can selecting infrared wavelength transition material, make the only infrared light of wavelength conversion sheet 103 stimulated emission.
Exciting light 111 is radiated on this region 141 and forms hot spot 111a.In the present embodiment, drive unit 105 is motors.Wavelength conversion sheet 103 is driven by motor 105, relative to exciting light 111 along predetermined path of movement 111b periodic relative motion.The luminescence of material for transformation of wave length does not have directivity and coherence, therefore has safe advantage compared with laser diode.The luminous energy density of this flashlight emitter 100 depends on the size of exciting light hot spot 111a simultaneously; As long as the size of hot spot 111a is enough little, then the luminosity of flashlight emitter 100 can have obvious advantage compared with light-emitting diode.Therefore, flashlight emitter 100 can launch the flashlight being applicable to long range propagation to human eye fanout free region.
In order to the size realizing exciting light hot spot 111a is enough little, preferably, excitaton source 101 adopts laser diode as light source, such as blue light laser diode or ultraviolet laser diode.
In the present invention, if wavelength conversion sheet 103 transfixion, then exciting light hot spot 111a place position can temperature constantly rises due to the continuous accumulation of the heat of material for transformation of wave length, finally make material for transformation of wave length generation thermal quenching and can not be luminous.The effect of drive unit 105 is to make heat can not accumulation but be scattered in a larger region on the material for transformation of wave length of local, can not be very high with the temperature of the material for transformation of wave length keeping any one local, and then ensure that the normal work of wavelength conversion sheet 103.
The light sent due to wavelength conversion sheet 103 does not have directivity, and flashlight emitter 100 also comprises light projecting apparatus 107, enables this flashlight be received device reception for collecting also superframe signal light 113.In the present embodiment, light projecting apparatus 107 comprises the set of lenses of two panels lens composition, and it is converted into collimated light after flashlight can being collected.In fact, this light projecting apparatus 107 is not limited to use lens, compound parabolic collector (the CPC that light-emitting window area can also be used to be greater than the taper square rod of light inlet area or light-emitting window area be greater than light inlet area, compoundparabolicconcentrator), just passable as long as zooming in directed projection of flashlight emission angle can be realized.
Flashlight emitter 100 also comprises control device 109.In the present embodiment, this control device 109 is connected with excitaton source 101, and controls power or the switch of the exciting light 111 that this excitaton source 101 is launched, and the luminous intensity of the emergent light 113 that flashlight emitter 100 is sent changes to form flashlight.This emergent light 113 may be Stimulated Light itself, or Stimulated Light and do not have the mixed light of absorbed exciting light.
Illustrate the method for work of this control device 109 below.Fig. 1 b illustrates flashlight emitter 100 when launching the train of signal of figure pattern, a citing of the operating state of excitaton source 101.Easy understand, when control device 109 control excitaton source 101 close time, flashlight emitter 100 is not luminous, and this represents character " 0 "; And when control device 109 control excitaton source 101 open time, flashlight emitter 100 is luminous, and this represents character " 1 ".Therefore, as long as control the on off state of excitaton source along with the time by control device 109, just can realize this flashlight emitter 100 and launch digital signal string.
Easy understand, in order to realize communication at a high speed, excitaton source 101 must use can the light source of fast modulation, such as light-emitting diode or laser diode light source.And the driving power of excitaton source 101 when opening presets, such as, use the nominal drive current of light-emitting diode or laser diode.Can certainly use the drive current lower than nominal drive current, this is conducive to the prolongation in excitaton source 101 useful life, as long as signal light intensity is enough to the requirement meeting transmission.
When excitaton source 101 is closed, control device 109 still may keep certain bias voltage at the circuit two ends of this excitaton source 101, now due to this bias voltage lower than excitaton source 101 threshold voltage therefore this excitaton source still keep closed condition.The use of bias voltage contributes to the lifting of the modulation rate of this excitaton source.Even when needs flashlight sends character " 0 ", excitaton source 101 can not be closed but reduce drive current and be made it be operated in low power state, as long as now the intensity of flashlight will be judged as " 0 " lower than the signal threshold value of receiving system.The drive current of such excitaton source or the modulation amplitude of voltage can reduce further, and debugging speed can be accelerated further.
In the present embodiment, the distribution of the material for transformation of wave length on region 141 is uniform, in fact this uniformity allows to there is certain error, because although the uneven meeting of material for transformation of wave length causes the change of signal light intensity, as long as but this intensity is higher than the receive threshold of receiving system, character " 1 " will be judged as and affect the quality of communication.
Except sending the flashlight of figure pattern, the flashlight of all right launching simulation pattern of flashlight emitter 100, Fig. 1 c illustrates a citing of the operating state of now excitaton source.The signal strength signal intensity that this timed unit can send as required regulates the driving power of excitaton source to regulate the power of exciting light, and then the intensity of flashlight is changed thereupon.It should be noted that the intensity due to flashlight depends on the intensity of exciting light and the efficiency of wavelength conversion sheet simultaneously, therefore the intensity of flashlight becomes non-linear relation with the driving power of excitaton source; Fig. 1 d illustrates a citing of the relation between signal light intensity and the drive current of excitaton source.Visible, along with the increase of drive current, signal light intensity can be tending towards saturation condition and increasing degree reduces.
Therefore, when flashlight emitter needs to send analog signal light, need first to set up the mapping table of signal light intensity and drive current and be stored in control device internal storage; When needing the flashlight of a transmission certain strength, first can inquire about corresponding driving current value according to the numerical value of this certain strength in this relation table, then driving excitaton source according to this driving current value.Certainly, also can set up the mapping table of signal light intensity and driving power, similar close technology all belongs to protection scope of the present invention.
In the present embodiment, control device is utilized to control switch or the power of exciting light, can control the switch of flashlight that this flashlight emitter launches or power to make its carry information, therefore the carrier of signal message is the change of the intensity of flashlight in the present embodiment.In fact, the carrier of signal message can also be the change of other attribute of flashlight, the wavelength of such as flashlight or polarization state etc., can introduce to some extent in this embodiment below.
As the second embodiment of the present invention, on the basis of the flashlight emitter of above-mentioned first embodiment, the invention allows for a kind of optical communication system, as shown in Figure 2.In this optical communication system, comprise flashlight emitter as shown in Figure 1, also comprise the flashlight receiving system 231 in the range of exposures being positioned over flashlight emitter, the flashlight of different attribute can be converted to the different signals of telecommunication by this flashlight receiving system 231, and then obtains the information of carrying in flashlight.
The most frequently used flashlight receiving system is photodiode.Flashlight is irradiated to photodiode surface can make the positive and negative end of this photodiode produce electrical potential difference, if this both positive and negative polarity is conducted, can generation current, and the change of flashlight light intensity therefore can be determined by measuring this electrical potential difference or electric current.This can directly apply to when signal light intensity is as the situation of information carrier.
And when other attribute of flashlight is as information carrier, photodiode still can be used to obtain the information in flashlight.Such as, when the wavelength in flashlight is as information carrier, a filter can be used on the surface of photodiode, the light of a specific wavelength in this filter transmission signal light, the light of this wavelength is as character " 1 ", and other wavelength is as character " 0 ".Again such as, when the polarization state in flashlight is as information carrier, a polarizer can be used at LED surface, this polarizer can only allow the light of some polarization states to pass through, the light of all the other polarization states is then absorbed or is reflected, therefore this be allowed to through the light of polarization state represent character " 1 ", and the light of other polarization state is character " 0 ".
What deserves to be explained is, this optical communication system also can use flashlight emitter in following embodiment to the light that transmits.
The front view of the wavelength conversion sheet in the flashlight emitter of the third embodiment of the present invention as shown in Figure 3.Comprising two regions 341 and 342, control device can control to excite the switching of hot spot between movement locus 341b and 342b corresponding to these two regions.Region 341 and 342 has different wavelength convert attributes, therefore movement locus 341b and 342b also has different wave length converting attribute, and then the utilizing emitted light produced respectively has different attributes.
Citing is below illustrated.
Citing 1: region 341 comprises yellow fluorescent powder, can stimulated emission gold-tinted; Region 342 comprises red fluorescence powder, can stimulated emission ruddiness.Now the radiative peak wavelength that produces respectively of movement locus 341b with 342b is different.
Citing 2: excitaton source adopts blue laser diode as light source; Region 341 comprises yellow fluorescent powder, can stimulated emission gold-tinted; Region 342 comprises diffusion material, and blue laser is scattered after inciding this diffusion material to eliminate its coherence and directivity.Now the radiative peak wavelength that produces respectively of movement locus 341b with 342b is different.
Citing 3: region 341 and region 342 all comprise yellow fluorescent powder, can stimulated emission gold-tinted; Region 341 covers the linear polarizer that polarization direction is horizontal direction, region 342 covers the linear polarizer that polarization direction is numerical value direction.Now the radiative polarization direction that produces respectively of movement locus 341b with 342b is mutually vertical.
Citing 4: region 341 and region 342 comprise two kinds of different yellow fluorescent powders respectively, all can stimulated emission gold-tinted.The wavelength conversion efficiency of these two kinds of yellow fluorescent powders is different, and therefore now the radiative luminous intensity that produces respectively of movement locus 341b with 342b is different.
Fig. 4 a and 4b show respectively the citing of the structure of two kinds of flashlight emitters, and wherein control device can control to excite the switching of hot spot between different motion track 341b and 342b.In fig .4, also comprise direction arrangement for deflecting 402, the direction that this light deflection device 402 can control exciting light deflects, and the position of hot spot on this wavelength conversion sheet making it be irradiated to wavelength conversion sheet is formed changes.Specifically, in the present embodiment, light deflection device is speculum 402, the exciting light that excitaton source 401 sends is incident on wavelength conversion sheet 403 after the reflection of speculum 402, be appreciated that, control device (not shown in FIG.) can adjust the position of hot spot on wavelength conversion sheet of exciting light by adjusting the placed angle of speculum 402, and then realizes its switching between different motion track.
In fact also have the implementation of other light deflection device, such as, use a prism rotated, or directly deflect excitaton source; This is prior art, does not repeat herein.
In fig. 4b, the drive unit 405 be fixedly connected with wavelength conversion sheet is fixedly connected with an offset assembly device 406, this offset assembly offsets for making the position of drive unit, be appreciated that, control device (not shown in FIG.ly can adjust the position of hot spot on wavelength conversion sheet of exciting light by controlling offset assembly, and then realize its switching between different motion track.Certainly, offset assembly also can be fixedly connected with excitaton source and its position is offset, and this can reach identical effect.
In the present embodiment, with the first embodiment unlike, control the switching of exciting light hot spot on wavelength conversion sheet in different tracks by control device, change certain attribute of flashlight to make its carry information.Be appreciated that this is only applicable to the situation of transmission of digital signals according to description above.Certainly, also can in conjunction with the first embodiment and the 3rd embodiment, namely control device controls opening the light of exciting light or strong and weak, also controls the switching of exciting light hot spot on wavelength conversion sheet in different tracks, make flashlight carry information with timed unit.
First and the 3rd in embodiment, drive unit is all motor, and its drives wavelength conversion sheet to carry out circular motion; In fact, drive unit can also be other drive unit.In the flashlight emitter 500 of the fourth embodiment of the present invention, as shown in Figure 5, the motor (not shown in FIG.) of wavelength conversion sheet 503 and a straight reciprocating motion is fixed together, the relative motion of the exciting light generation straight line that itself and excitaton source 501 are launched.
In the present embodiment, wavelength conversion sheet 503 also can have two or more region as the 3rd embodiment, often as shown in Figure 5 a.Wherein region 503a and 503b has different wavelength convert attributes.
In flashlight emitter in the above-described embodiments, exciting light is from a face incidence of wavelength conversion sheet, and light projecting apparatus collects flashlight from another face of wavelength conversion sheet.In fact, exciting light and flashlight can at the homonymies of wavelength conversion sheet.The structural representation of the fifth embodiment of the present invention as shown in Figure 6.In this flashlight emitter 600, the exciting light 611 that excitaton source 601 is launched is incident on a light splitting filter 602, this light splitting filter transmission exciting light 611, and simultaneously reflection wavelength conversion sheet 603 is excited the Stimulated Light 613 that sends.Be incident on wavelength conversion sheet 603 after exciting light 611 transmission light splitting filter 602, and excitation wavelength conversion sheet 603 launches Stimulated Light 613, this Stimulated Light 613 through lens 607 collection and be incident in light splitting filter 602 and reflected to form flashlight outgoing by it after collimation.
In the present embodiment, lens 607 serve the effect of light projecting apparatus, also serve the effect of converges activation light to wavelength conversion sheet simultaneously.
Be understandable that, the structure of the present invention not exciting light of restricting signal light emitting devices and the light path of flashlight, more than just citing.
Fig. 7 shows another wavelength conversion sheet in the present invention, wherein 711a represents that exciting light incides the hot spot on this wavelength conversion sheet, 711b represents the movement locus of this hot spot, 751,752,753 and 754 represent the different region on this movement locus 711b respectively, each region has different wavelength convert attributes, and therefore the attribute of the flashlight that each region is corresponding is also different.This can be applied to multi channel time-division multiplex communication.Such as in the present embodiment, region 751,752,753 and 754 corresponds respectively to channel 1 to 4, and when region 751 turns to the position of exciting light hot spot 711a, with reference to the description of the first embodiment, this flashlight emitter can launch the signal of channel 1; When the position of exciting light hot spot 711a is rotated out in region 751, region 752 turns to the position of hot spot 711a, this flashlight emitter stops the signal of reflected channel 1 and launches the signal of channel 2, the rest may be inferred, this flashlight emitter signal of transmitting channel 1 to 4 that just can circulate successively, realizes the time division multiplexing of these four channels like this.
Correspond, these four channels correspond to four flashlight receiving systems, the flashlight that they are distinguished corresponding to oneself according to the attribute of the flashlight accepted separately is different respectively.Such as in the present embodiment, four regions 751,752,753 and 754 comprise the fluorescent material of four kinds of different colours respectively, therefore the peak wavelength of the flashlight of its each spontaneous emission is different, filter just can be utilized to filter out its remaining light respectively like this and the flashlight that receives only corresponding to oneself at corresponding with it four flashlight receiving systems.
Be appreciated that and movement locus 711b at least comprises Liang Ge district, just can the time division multiplexing of two channels corresponding to this Liang Ge district.
It is worth mentioning that, utilize wavelength conversion sheet as shown in Fig. 3 or Fig. 5 a also can realize multi channel time division multiplexing, as long as utilize control device to control exciting light hot spot switch time division multiplexing between the different channel that just can realize corresponding to this two region between region 341 and 342.Therefore, the structure of the wavelength conversion sheet shown in Fig. 3 and Fig. 5 a, the change that both can be used for realizing flashlight attribute carries signal to make it, also can realize the switching of channel.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a flashlight emitter, is applied to optical communication system, it is characterized in that, comprising:
For launching the excitaton source of exciting light;
Wavelength converter, this Wavelength converter comprise for receive exciting light and launch Stimulated Light wavelength conversion sheet and for driving this wavelength conversion sheet relative to the drive unit of described exciting light along predetermined path of movement periodic relative motion;
Control device, for controlling power or the switch of described exciting light, and/or control exciting light is irradiated to the switching of hot spot between the different predetermined path of movement of this hot spot relative to this wavelength conversion sheet that described wavelength conversion sheet is formed, the attribute of the Stimulated Light that flashlight emitter is sent or the mixed light of Stimulated Light and exciting light changes to form flashlight, and described flashlight carries digital signal information or analog signal information; Described difference
Predetermined path of movement has different wavelength convert attributes;
Light projecting apparatus, for collecting and projecting described flashlight.
2. flashlight emitter according to claim 1, is characterized in that, described excitaton source is laser diode light source.
3. flashlight emitter according to claim 1, it is characterized in that, described exciting light is irradiated to the hot spot that described wavelength conversion sheet is formed and comprises the firstth district at this hot spot relative in the predetermined path of movement of this wavelength conversion sheet, and this firstth district comprises first wave length transition material.
4. flashlight emitter according to claim 3, is characterized in that, in described predetermined path of movement, also comprises the secondth district, and this secondth district comprises second wave length transition material or diffusion material.
5. flashlight emitter according to claim 1, is characterized in that, described wavelength conversion sheet comprises infrared wavelength transition material, for absorbing described exciting light and radiating infrared light.
6. flashlight emitter according to claim 1, is characterized in that, the different predetermined path of movement on wavelength conversion sheet have different wavelength conversion efficiencies, or different Stimulated Light wavelength, or different polarization states.
7. flashlight emitter according to claim 1, is characterized in that, wavelength conversion sheet exists specific predetermined path of movement, this specific predetermined path of movement comprises diffusion material and does not comprise material for transformation of wave length.
8. flashlight emitter according to claim 1, it is characterized in that, control device comprises light deflection device, the direction that this light deflection device can control exciting light deflects, and the position of hot spot on this wavelength conversion sheet making it be irradiated to described wavelength conversion sheet is formed changes.
9. flashlight emitter according to claim 1, it is characterized in that, control device comprises offset assembly, this offset assembly offsets for making the position of described drive unit or excitaton source, and the position of hot spot on this wavelength conversion sheet exciting light being irradiated to described wavelength conversion sheet is formed changes.
10. an optical communication system, is characterized in that, comprising:
Flashlight emitter for the light that transmits as claimed in any of claims 1 to 9;
At least one is for receiving the flashlight receiving system of described flashlight, and the flashlight of different attribute can be converted to the different signals of telecommunication by this flashlight receiving system.
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| CN110927707B (en) * | 2018-09-19 | 2023-08-25 | 北京木牛领航科技有限公司 | Method and device for changing wave attribute |
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| CN101836160A (en) * | 2007-07-30 | 2010-09-15 | 绎立锐光科技开发公司 | Multicolor illumination device using moving plate with wavelength conversion materials |
| CN102089945A (en) * | 2008-07-07 | 2011-06-08 | 皇家飞利浦电子股份有限公司 | Eye-safe laser-based lighting |
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| CN101836160A (en) * | 2007-07-30 | 2010-09-15 | 绎立锐光科技开发公司 | Multicolor illumination device using moving plate with wavelength conversion materials |
| CN102089945A (en) * | 2008-07-07 | 2011-06-08 | 皇家飞利浦电子股份有限公司 | Eye-safe laser-based lighting |
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