CN107678170B - A kind of realization system of flexibility varied angle slot array diffraction optical device - Google Patents
A kind of realization system of flexibility varied angle slot array diffraction optical device Download PDFInfo
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- CN107678170B CN107678170B CN201710984937.0A CN201710984937A CN107678170B CN 107678170 B CN107678170 B CN 107678170B CN 201710984937 A CN201710984937 A CN 201710984937A CN 107678170 B CN107678170 B CN 107678170B
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/0808—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more diffracting elements
Abstract
A kind of realization system of flexibility varied angle slot array diffraction optical device, including mechanical module, electricity control module and optical module, the optical module includes laser, calibration lens, diaphragm, flexible varied angle slot array diffraction optical device, imaging len, projection screen and CCD camera and computer processing system, the laser is the mono-colour laser of any wavelength in visible-range, and the laser, calibration lens, diaphragm, flexible varied angle slot array diffraction optical device and imaging len are located in same optical axis；The mechanical module includes crawler type transmission device；The electricity control module includes the driving motor for driving flexible varied angle slot array diffraction optical device to realize crawler type movement in turn for driving crawler type transmission device to rotate.All band speckle inhibitory effect of the present invention is good, motion mode is simple, be easily achieved and system versatility, robustness are good, low in cost.
Description
Technical field
The invention belongs to laser display projection field more particularly to a kind of realities of flexible varied angle slot array diffraction optical device
Existing system realizes system using the diffraction optical device that campaign-styled diffraction optical device carries out laser speckle inhibition.
Background technique
Laser light projection display system because its have it is rich in color, image quality is high, the service life is long, high reliablity, effect
High, low power consumption and other advantages, by more and more extensive concern and welcome.However since laser is high coherent light, inevitably
A kind of picture noise for being known as laser speckle can be generated.Speckle shows as being randomly dispersed in the black splotch in laser facula,
Substantially the random coherent superposition of signal, the presence of speckle seriously affect the quality of image and information.It shows and leads in laser projection
Domain, speckle can be such that the image quality of Projection Display declines, and cause viewer to generate the symptoms such as tired and dizzy, seriously affect
The experience of laser-projector user becomes the central factor for restricting laser light projection display system and Instrument Development.Therefore, it researches and develops
Laser speckle suppression technology and device are very necessary.
Most common method used by inhibiting in prior art to laser speckle, is the diffraction optics device using movement
Part.For many years, researcher reports a variety of diffraction optical devices, the optical grating construction including the normal period；Based on pseudorandomcode, M
Sequential coding, Barker code micro optical structure；Micro optical structure etc. based on Hadamard matrix.Laser beam passes through these
Diffraction optical device forms diffractive light field, and the superposition of the diffractive light field of dynamic change can destroy the coherence of laser, go forward side by side
And play the role of inhibiting laser speckle.In order to formed dynamic change diffractive light field superposition, need to diffraction optical device
It is shaken, linear displacement, the mechanical motion modes such as rotary motion.However such motion mode not only mechanical part and operation
Mechanism is complicated, huge, and has impact damage to laser projection display instrument.In addition, due to needing to move back and forth so that can not
Guarantee that diffraction optical device is in uniform speed motion state, therefore speckle inhibitory effect is also not ideal enough.In above-mentioned prior art with
The immediate diffraction optical device of the present invention and its realization system, such as in " Hadamard speckle contrast
Reduction " Jahja I.Trisnadi is used be based on for the first time in (2004, Opt.Lett.29,11-13) text
The diffraction optical device of Hadamard matrix structure simultaneously gives implementation；In " Full speckle suppression in
laser projectors using two Barker code-type diffractive optical elements》
In (2013, J.Opt.Soc.Am.A 30,22-31) text, Lapchuk et al. uses two spreading out based on Barker code structure
It penetrates optical device and makes it in the plane perpendicular to optical axis, moved along the direction being at an angle to the horizontal surface, (both to all band
Including red, green, blue) laser carried out speckle Inhibition test；Happy diligent pure, Xiong Qiyuan, Dong Wen and Fu Minglei are in Chinese invention patent
The binary optical using movement is proposed in " a kind of laser speckle suppressing method based on diffractive-optical element " (CN 106896520A)
Diffraction element is learned to inhibit laser speckle.
However the art methods of above-mentioned based drive diffraction optical device, equal existing defects.Or speckle inhibits
Degree is inadequate；Or it not can be carried out the inhibition of all band speckle；Or structure design difficulty it is too big, System Error-tolerance Property, robustness,
Versatility is very poor, is not able to satisfy practical application request；Or reciprocating machine is needed to move, it is mechanical to laser projection display instrument
That impact is big, stability is bad, structure is complicated is huge, energy consumption is high, effect is low, and need to change during the motion speed and lead to speckle
Inhibitory effect is bad etc..
Summary of the invention
In order to overcome, prior art speckle inhibitory effect is not good enough, not can be carried out the inhibition of all band speckle, system using device
Part number and type is more, moving component is complicated and has that impact damage, size are big, apparatus structure is complicated, energy consumption is high, effect to instrument
Low disadvantage, the present invention provide that a kind of all band speckle inhibitory effect is good, motion mode is simple, be easily achieved and system is general
Property, good, the low-cost flexible varied angle slot array diffraction optical device of robustness realization system, using flexible material production,
By varied angle slot array diffraction structure, building infinitely can at the uniform velocity recycle crawler type motion mode, with set of system realize it is red,
Green, blue all band laser speckle inhibits.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of realization system of flexibility varied angle slot array diffraction optical device, including mechanical module, electricity control module and
Optical module, the optical module include laser, calibration lens, diaphragm, flexible varied angle slot array diffraction optical device, imaging
Lens, projection screen and CCD camera and computer processing system, the laser can be any wavelength in visible-range
Mono-colour laser, the laser, calibration lens, diaphragm, flexible varied angle slot array diffraction optical device and imaging len position
In in same optical axis；The mechanical module includes crawler type transmission device；The electricity control module includes for driving crawler belt
The driving motor that formula transmission device rotates and then flexible varied angle slot array diffraction optical device is driven to realize crawler type movement.
Further, the mechanical module includes rack, two Rotary cloumns and spring, and a Rotary cloumn can control translation
And be rotatably sleeved on the side of rack, the spring one end is connect with a Rotary cloumn, the spring it is another
End is fixed on the rack；Another Rotary cloumn is rotatably sleeved on the other side of rack, another Rotary cloumn with
The output shaft of driving motor is sequentially connected, and the flexibility varied angle slot array diffraction optical device is wound on two Rotary cloumns
On, the pulling force of the spring makes flexible varied angle slot array diffraction optical device be in tensional state always.
Further, driving gear, the outer end of another Rotary cloumn are installed on the output shaft of the driving motor
Driven gear is installed, the driving gear is engaged with the driven gear.It is of course also possible to be the other kind of drive.
The driving motor is stepper motor.
The optical module can be, but not limited to include red laser and its calibration lens, green (light) laser and its calibration
Lens, blue laser and its calibration lens, through the light splitting piece of reflection to red light green light blue light, through feux rouges green reflection blue light
Light splitting piece；The red laser and its calibration lens, through the light splitting piece of reflection to red light green light blue light, through feux rouges green light
Light splitting piece, diaphragm, the property varied angle slot array diffraction optical device and the imaging len of reflection blue light are located in same optical axis, and
For primary optical axis, the optical axis of the green (light) laser and its calibration lens, blue laser and its calibration lens is vertical with primary optical axis,
The green laser that the green (light) laser issues enters main optical path, the indigo plant by the light splitting piece through reflection to red light green light blue light
The blue laser that light laser issues enters main optical path by the light splitting piece through feux rouges green reflection blue light.
The flexibility varied angle slot array diffraction optical device is produced on flexible material, by N group one-dimensional binary diffraction optics
Structure head and the tail are formed by connecting, and the one-dimensional binary diffractive optical structure includes optical grating construction and optical microstructures, described one-dimensional to be
Finger diffractive optical structure is one-dimensional patterns, and the binary refers to that because diffractive optical structure depth is formed by optical path difference be binaryzation
's.
The one-dimensional binary diffractive optical structure pattern is indicated that the parameter T is that the minimum of optical microstructures is single by parameter T
First width, the width of all optical microstructures indicate with the integral multiple of T, the one-dimensional binary diffractive optical structure pattern
Overall width T0It indicates；The depth of the one-dimensional binary diffractive optical structure is h, the one-dimensional binary diffractive optical structure and X
Inclination angle folded by axis is θ0。
The optical microstructures are the optical microstructures based on pseudo-random sequence, optical microstructures or base based on M sequence
In the optical microstructures of Barker code.
The N is positive integer, array number included in the flexible varied angle slot array diffraction optical device of expression, N=1,
2,3 ... ∞, as N=1, the flexible varied angle slot array diffraction optical device inhibited for laser speckle is single diffraction light
Device, i.e. diffraction optical device unit are learned, the structural parameters including m period are identical in each diffraction optical device unit
One-dimensional binary diffractive optical structure pattern；As N≤2, the flexible varied angle slot array diffraction light inhibited for laser speckle
Device is the diffraction optical device comprising N number of array；N number of diffraction optical device unit in the array is disposably produced on
One-dimensional binary diffractive optical structure pattern phase on monolithic flexible material, inside N number of diffraction optical device unit in array
With or it is not identical, N group one-dimensional binary diffractive optical structure head and the tail connect, along Y direction by the 1st group of diffractive optical structure
Head be connected with the tail of N group diffractive optical structure.
N number of diffraction optical device unit in array is different from inclination angle folded by X-axis, is expressed as θ±i, wherein θ±i=θ0±
(N-1) 2 Δ θ ± i Δ θ, Δ θ indicate the amplitude of variation at inclination angle folded by neighboring diffraction optical device unit and X-axis.
The depth h of Binary Diffractive Optics structure is related with the refractive index of flexible material, and range is in 350nm to 650nm.
The flexible material refers to transparent to the visible light wave range including red, green, blue, soft bent material
Material, the flexible material includes thermoplastic or Other substrate materials.
The thermoplastic includes polyethylene terephtalate, polyvinylchloride or polycarbonate.
The Other substrate materials include polydimethylsiloxane or light-sensitive polyimide photoresist PSPI.
Technical concept of the invention is: by making varied angle slot array diffraction optical device, benefit on monolithic flexible material
The phase distribution for changing laser beam with the diffraction optics micro-structure of movement, destroys the spatial coherence of laser, to reach
Inhibit the effect of speckle.
Further, using the bending of flexible material so that N group it is different one-dimensional binary diffractive optical structure it is mutually folded
Add, forms the two-dimensional optical code based on two-sided one-dimensional diffraction optics micro-structure；It is moved using continuous crawler type so that being superimposed
Optical texture dynamic change, to achieve the effect that all band laser speckle inhibits and improves laser speckle inhibiting rate.
Further, since crawler type transmission is in cycles, to effectively prevent transporting in reciprocating machine motion process
The variation of dynamic speed reduces interference noise caused by system injury caused by mechanical movement impact and movement velocity variation.
Still further, by invention varied angle slot array structure, so that being realized in the case where only needing one-dimensional square to move
The technical effect of two-dimension displacement.
Beneficial effects of the present invention are mainly manifested in: (1) use flexible material so that crawler type continuously move become can
Energy.(2) multiple groups diffraction optics micro-structure is made in single piece of material, size is small, high-efficient.(3) using flexible material bending and
Crawler type continuously moves, so that the different one-dimensional binary diffractive optical structure of N group is overlapped mutually and dynamic change, it theoretically can be real
Existing all band laser speckle inhibits.(4) by invention varied angle slot array structure, so that the case where only one-dimensional square being needed to move
Under, realize the technical effect of two-dimension displacement.(5) it replaces reciprocating machine to move using crawler type movement, possesses more stable
Speckle inhibitory effect and smaller noise jamming, but also total is more stable.(6) entire speckle inhibition system includes
Three color laser light source of red, green, blue realizes that all band laser speckle inhibits on hardware, and system structure is simple and compact, stable, logical
With property is good, effect is high, low energy consumption.
Detailed description of the invention
Fig. 1 is schematic diagram (the micro- knot of optics of diffractive optical element unit in flexible varied angle slot array diffraction optical device of the invention
Structure is by taking M sequence as an example).
Fig. 2 is the array arrangement schematic diagram of flexible varied angle slot array diffraction optical device of the invention.
Fig. 3 is flexible varied angle slot array diffraction optical device of the invention and its realizes system schematic, wherein 1 is feux rouges
Laser and its calibration lens；2 be green (light) laser and its calibration lens；3 be blue laser and its calibration lens；4 are
Cross the light splitting piece of reflection to red light green light blue light；5 be the light splitting piece through feux rouges green reflection blue light；6 be diaphragm；7 be the present invention
Flexible varied angle slot array diffraction optical device and its crawler actuator；8 be imaging len；9 be projection screen；10 be CCD
Camera and its computer processing system.
Fig. 4 is that flexible varied angle slot array diffraction optical device and its crawler actuator of the invention and the kind of drive are shown
It is intended to, wherein 1 is position of the laser irradiation on flexible varied angle slot array diffraction optical device of the invention；2 be that two realizations are carried out
The Rotary cloumn of belt movement；3 be the gear for connecting stepper motor；4 be for flexible varied angle slot array diffraction optics device of the invention
Two springs of part offer pulling force；5 be that the flexible varied angle slot array diffraction optical device of the control present invention carries out crawler type movement
Electricity control module；6 second Rotary cloumn of expression are fixed with spring, make flexible varied angle slot array diffraction optical device of the invention
It is constantly in tensional state.
Fig. 5 is that the present invention is moved using one-dimensional square, realizes the technical schematic diagram of two-dimension displacement effect.
Fig. 6 is flexible varied angle slot array diffraction optical device of the invention and its realizes that system carries out speckle suppression to red laser
The result figure of system, the optical field distribution before the inhibition of Fig. 6 (a) speckle, the optical field distribution after the inhibition of Fig. 6 (b) speckle.
Fig. 7 is flexible varied angle slot array diffraction optical device of the invention and its realizes that system carries out speckle suppression to green laser
The result figure of system, the optical field distribution before the inhibition of Fig. 7 (a) speckle, the optical field distribution after the inhibition of Fig. 7 (b) speckle.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
Referring to Fig.1~Fig. 7, a kind of realization system of flexibility varied angle slot array diffraction optical device, including mechanical module, electricity
Control module and optical module are learned, the optical module includes laser, calibration lens, diaphragm, flexible varied angle slot array diffraction
Optical device, imaging len, projection screen and CCD camera and computer processing system, the laser can be visible light model
The mono-colour laser of any wavelength in enclosing, the laser, calibration lens, diaphragm, flexible varied angle slot array diffraction optics device
Part and imaging len are located in same optical axis；The mechanical module includes crawler type transmission device；The electricity control module packet
It includes for driving crawler type transmission device to rotate and then flexible varied angle slot array diffraction optical device being driven to realize crawler type movement
Driving motor.
Further, the mechanical module includes rack, two Rotary cloumns and spring, and a Rotary cloumn can control translation
And be rotatably sleeved on the side of rack, the spring one end is connect with a Rotary cloumn, the spring it is another
End is fixed on the rack；Another Rotary cloumn is rotatably sleeved on the other side of rack, another Rotary cloumn with
The output shaft of driving motor is sequentially connected, and the flexibility varied angle slot array diffraction optical device is wound on two Rotary cloumns
On, the pulling force of the spring makes flexible varied angle slot array diffraction optical device be in tensional state always.
Further, driving gear, the outer end of another Rotary cloumn are installed on the output shaft of the driving motor
Driven gear is installed, the driving gear is engaged with the driven gear.It is of course also possible to be the other kind of drive.
The driving motor is stepper motor.
The diameter of the two root posts is 4 millimeters；Two springs are mounted on a Rotary cloumn, the electricity control
Molding block, the controller including stepper motor and driving stepper motor, the controller by the control process control write in advance,
Main control parameters are starting caterpillar drive, stop caterpillar drive and caterpillar drive speed, the caterpillar drive
Speed is 100rpm/min.
The optical module can be, but not limited to include red laser and its calibration lens, green (light) laser and its calibration
Lens, blue laser and its calibration lens, through the light splitting piece of reflection to red light green light blue light, through feux rouges green reflection blue light
Light splitting piece, diaphragm, the flexible varied angle slot array diffraction optical device, imaging len, projection screen, CCD camera and its meter
Calculation machine processing system.The red laser and its calibration lens, through the light splitting piece of reflection to red light green light blue light, through feux rouges
Light splitting piece, diaphragm, the flexible varied angle slot array diffraction optical device and the imaging len of green reflection blue light are located at same light
It on axis, and is primary optical axis, the green (light) laser and its calibration lens, blue laser and its optical axis and key light of calibrating lens
Axis is vertical；The green laser that the green (light) laser issues enters key light by the light splitting piece through reflection to red light green light blue light
Road, the blue laser that the blue laser issues enter main optical path by the light splitting piece through feux rouges green reflection blue light.
When only opening red laser, red laser beam passes through the light splitting piece through reflection to red light green light blue light, transmission
Light splitting piece, the diaphragm of feux rouges green reflection blue light, in normal incidence to varied angle slot array diffraction optical device of the invention flexible, electricity
Controller in module drives stepper motor, and stepper motor drives the crawler type transmission device in mechanical module to carry out crawler type fortune
Dynamic, the different diffraction optics micro-structures dynamic before and after the flexibility varied angle slot array diffraction optical device on two layers is superimposed, to red
Color laser beam is modulated.The projection screen recording laser projection imaging is simultaneously directly visually observed.The CCD camera note
It records the laser projection imaging on projection screen and inputs computer and carry out follow-up data processing.
When only opening green laser, the light splitting piece that green laser beam is through reflection to red light green light blue light is reflected into
Main optical path, then light splitting piece, diaphragm by penetrating feux rouges green reflection blue light, normal incidence are spread out to flexible varied angle slot array of the invention
It penetrates on optical device, the controller in electrical module drives stepper motor, and stepper motor drives the crawler type in mechanical module to pass
Device is sent to carry out crawler type movement, the different diffraction optics before and after the flexibility varied angle slot array diffraction optical device on two layers are micro-
Structure dynamics superposition, is modulated green laser beam.The projection screen recording laser projection imaging simultaneously directly carries out visual
Observation.The CCD camera, which records the laser projection imaging on projection screen and inputs computer, carries out follow-up data processing.
When only opening blue laser, the light splitting piece that blue laser beam is through feux rouges green reflection blue light is reflected into
Main optical path, then pass through diaphragm, the control in normal incidence to flexible varied angle slot array diffraction optical device of the invention, in electrical module
Device drives stepper motor, and stepper motor drives the crawler type transmission device in mechanical module to carry out crawler type movement, the flexibility
Different diffraction optics micro-structures dynamic before and after varied angle slot array diffraction optical device on two layers is superimposed, and is carried out to blue laser beam
Modulation.The projection screen recording laser projection imaging is simultaneously directly visually observed.On the CCD camera record projection screen
Laser projection imaging and input computer carry out follow-up data processing.
When opening simultaneously red and green laser, red laser beam passes through the light splitting through reflection to red light green light blue light
Piece, the green laser beam that main optical path is reflected into the light splitting piece for being through reflection to red light green light blue light are mixed to form sodium yellow,
The yellow light penetrates light splitting piece, the diaphragm of feux rouges green reflection blue light, normal incidence to flexible varied angle slot array diffraction light of the invention
It learns on device, the controller in electrical module drives stepper motor, and stepper motor drives the crawler type in mechanical module to transmit dress
It sets and carries out crawler type movement, the different diffraction optics micro-structures before and after the flexibility varied angle slot array diffraction optical device on two layers
Dynamic is superimposed, and is modulated to yellow light.The projection screen recording laser projection imaging is simultaneously directly visually observed.It is described
CCD camera, which records the laser projection imaging on projection screen and inputs computer, carries out follow-up data processing.
When opening simultaneously red, green and blue laser, red laser beam, which passes through, penetrates reflection to red light green light blue light
Light splitting piece, the green laser beam that main optical path is reflected into the light splitting piece for being through reflection to red light green light blue light is mixed to form Huang
Coloured light, the yellow light penetrate the light splitting piece of feux rouges green reflection blue light, anti-with the light splitting piece that is through feux rouges green reflection blue light
The blue laser beam injected into main optical path is mixed to form white light, and the white light passes through diaphragm, normal incidence to flexible change of the invention again
On angular array diffraction optical device, the controller in electrical module drives stepper motor, and stepper motor drives in mechanical module
Crawler type transmission device carry out crawler type movement, the difference before and after the flexibility varied angle slot array diffraction optical device on two layers
Diffraction optics micro-structure dynamic is superimposed, and is modulated to white light.The projection screen recording laser projection imaging simultaneously directly carries out
Visually observation.The CCD camera, which records the laser projection imaging on projection screen and inputs computer, carries out follow-up data processing.
Flexible varied angle slot array diffraction optics micro-structure of the invention, is produced on PDMS flexible material, by 3 groups one-dimensional two
First diffractive optical structure head and the tail are formed by connecting.The one-dimensional binary diffractive optical structure is the optical microstructures (ginseng based on M sequence
See attached drawing 1 and attached drawing 2), one-dimensional Binary Diffractive Optics structure plan is indicated by parameter T, and the parameter T is optical microstructures
Minimum unit width, the width of all optical microstructures indicate with the integral multiple of T, the one-dimensional binary diffractive optical structure
The overall width T of pattern0It indicates.The depth of the one-dimensional binary diffractive optical structure is h, the one-dimensional binary diffraction optics knot
Inclination angle folded by structure and X-axis is θ0。
The T parameter is 4 microns, and one-dimensional binary diffractive optical structure depth h is 400 nanometers, and M sequence is encoded to 31 volumes
Code, i.e., 1111100110100100001010111011000.Inclination angle folded by 3 groups of one-dimensional binary diffractive optical structures and X-axis
Respectively 44.4 °, 45 °, 45.6 °, using the method for adhesive bonds, along Y direction by the head of the 1st group of diffractive optical structure
It is connected with the tail of the 3rd group of diffractive optical structure.
Referring to attached drawing 1, attached drawing 3 and attached drawing 5, the flexibility varied angle slot array diffraction optical device is along Y-axis bending and head and the tail
It is connected, forms track structure.The pedrail type flexible varied angle slot array diffraction optical device includes front and back two layers, each layer of packet
One-dimensional binary diffraction optics micro-structure is organized containing (N/2).When laser beam is irradiated to pedrail type flexible varied angle slot array diffraction optics device
When on part, light beam has passed through front and back two sheets of flexible varied angle slot array diffraction optics micro-structure, although the pedrail type flexible angle
N number of one-dimensional binary diffraction optics micro-structure in degree array diffraction optical device is one-dimentional structure, but front and back two sheets of flexible becomes
The superposition of angular array diffraction optics micro-structure, so that the one-dimensional diffraction optical device of script becomes two-dimentional diffraction optics device
Part.When carrying out crawler type movement, front and back two sheets of flexible varied angle slot array diffraction optics micro-structure with identical movement velocity, to
Opposite direction movement, therefore the flexible varied angle slot array diffraction optical device of the present invention, may be implemented red, green, blue all band laser
Speckle inhibits.
Further, the pedrail type flexible varied angle slot array diffraction optical device is fixed on two Rotary cloumns, institute
It states two Rotary cloumns and is mounted on one based on gear-driven crawler type transmission device, one in two Rotary cloumns
Two springs are connected on root, the spring applies pulling force to Rotary cloumn, makes pedrail type flexible varied angle slot array diffraction optics
Device is in tensional state always.The gear is mounted on the bottom of Rotary cloumn and is controlled by an electricity control module.Institute
Electricity control module is stated, gear is driven by stepper motor to control the flexible varied angle slot array diffraction optical device and carry out continuously
Crawler type movement.
A kind of working principle of the realization system of flexible varied angle slot array diffraction optical device of the present invention is as follows:
1) speckle contrast SC calculation formula:
Wherein σ is the standard deviation of light distribution,It is average intensity distribution.Most of speckle suppressing method starting point is all
Light distribution is set to be averaged.
2) a kind of flexible varied angle slot array diffraction optical device of the present invention is connected by N group one-dimensional binary diffractive optical structure head and the tail
It connects.The one-dimensional binary diffractive optical structure includes but is not limited to optical grating construction, the micro- knot of the optics based on pseudo-random sequence
Structure, the optical microstructures based on M sequence, the optical microstructures based on Barker code.It is with the optical microstructures based on M sequence
The principle of example, the pedrail type flexible varied angle slot array diffraction optical device inhibition speckle is: influencing laser speckle inhibitory effect
Fundamentals there are two: the direction of motion and movement velocity in motion process.With the linear displacement of X-direction and Y direction
Determine the influence of the direction of motion and movement velocity to speckle inhibitory effect, theoretical calculation formula is as follows:
Wherein D is the projection width of resolution of eye unit on the screen, x1,x2,y1,y2It is that laser beam passes through two pieces of edges
The Binary Diffractive Optics structure of moved in coaxial does not project to the coordinate on screen, H (x1,x2,y1,y2) and H (x1,x1,y1,y1) be
By the auto-correlation function of the laser beam of the screen plane of M sequence binary diffractive optic elements modulate:
Wherein Δ t is the time for exposure of human eye；V1It is the fortune of binary diffractive optic element image on the screen along the y axis
Dynamic speed, V2It is movement velocity along the x axis；T0It is the minimum unit length in binary diffractive optic element a cycle；M
It is nonzero integer；T (x, y, V, t) is the transmission coefficient function of binary diffractive optic element.
Feux rouges is only opened referring to attached drawing 6 for a kind of realization system of flexible varied angle slot array diffraction optical device of the present invention
Speckle suppression result when laser.Referring to attached drawing 7, for a kind of realization of flexible varied angle slot array diffraction optical device of the present invention
System, speckle suppression result when opening green (light) laser.
Claims (10)
1. a kind of realization system of flexibility varied angle slot array diffraction optical device, it is characterised in that: the realization system includes machine
Tool module, electricity control module and optical module, the optical module include laser, calibration lens, diaphragm, flexible varied angle
Array diffraction optical device, imaging len, projection screen and CCD camera and computer processing system, the laser are visible
The mono-colour laser of any wavelength in optical range, the laser, calibration lens, diaphragm, flexible varied angle slot array diffraction light
It learns device and imaging len is located in same optical axis；The mechanical module includes crawler type transmission device；The electricity controls mould
Block includes for driving crawler type transmission device to rotate and then flexible varied angle slot array diffraction optical device being driven to realize crawler type
The driving motor of movement；The flexibility varied angle slot array diffraction optical device carries out crawler type movement, and the varied angle refers to soft
N group one-dimensional binary diffractive optical structure and the angle of X-axis are different in property varied angle slot array diffraction optical device, the X-axis
Refer to the length direction of flexible varied angle slot array diffraction optical device.
2. a kind of realization system of flexible varied angle slot array diffraction optical device as described in claim 1, it is characterised in that: institute
Stating mechanical module includes rack, two Rotary cloumns and spring, and a Rotary cloumn can control translation and rotatably be sleeved on
The side of rack, the spring one end are connect with a Rotary cloumn, and the other end of the spring is fixed on the rack；Separately
A piece Rotary cloumn is rotatably sleeved on the other side of rack, the output shaft biography of another Rotary cloumn and driving motor
Dynamic connection, the flexibility varied angle slot array diffraction optical device are wound on two Rotary cloumns, and the pulling force of the spring makes
It obtains flexible varied angle slot array diffraction optical device and is in tensional state always.
3. a kind of realization system of flexible varied angle slot array diffraction optical device as claimed in claim 2, it is characterised in that: institute
It states and driving gear is installed on the output shaft of driving motor, driven gear, the master are installed in the outer end of another Rotary cloumn
Moving gear is engaged with the driven gear.
4. a kind of realization system of flexible varied angle slot array diffraction optical device as described in one of claim 1 ~ 3, feature
Be: the driving motor is stepper motor.
5. a kind of realization system of flexible varied angle slot array diffraction optical device as described in one of claim 1 ~ 3, feature
Be: the optical module includes red laser and its calibration lens, green (light) laser and its calibration lens, blue laser
And its calibration lens, through the light splitting piece of reflection to red light green light blue light, through the light splitting piece of feux rouges green reflection blue light；It is described red
Light laser and its calibration lens, through the light splitting piece of reflection to red light green light blue light, through the light splitting of feux rouges green reflection blue light
Piece, diaphragm, the flexible varied angle slot array diffraction optical device and imaging len are located in same optical axis, and are primary optical axis, institute
The optical axis stated green (light) laser and its calibrate lens, blue laser and its calibration lens is vertical with primary optical axis, and the green light swashs
The green laser that light device issues enters main optical path, the blue laser hair by the light splitting piece through reflection to red light green light blue light
Blue laser out enters main optical path by the light splitting piece through feux rouges green reflection blue light.
6. a kind of realization system of flexible varied angle slot array diffraction optical device as described in one of claim 1 ~ 3, feature
Be: the flexibility varied angle slot array diffraction optical device is produced on flexible material, by N group one-dimensional binary diffractive optical structure
Head and the tail are formed by connecting, and the one-dimensional binary diffractive optical structure includes optical grating construction and optical microstructures, it is described it is one-dimensional refer to spread out
Penetrating optical texture is one-dimensional patterns, and the binary refers to that because diffractive optical structure depth is formed by optical path difference be binaryzation.
7. a kind of realization system of flexible varied angle slot array diffraction optical device as claimed in claim 6, it is characterised in that: one
Dimension Binary Diffractive Optics structure plan is indicated that the parameter T is the minimum unit width of optical microstructures, Suo Youguang by parameter T
Learn micro-structure width indicated with the integral multiple of T, the overall width T of the one-dimensional binary diffractive optical structure pattern0It indicates；
The depth of the one-dimensional binary diffractive optical structure is h, and the one-dimensional binary diffractive optical structure is with inclination angle folded by X-axis。
8. a kind of realization system of flexible varied angle slot array diffraction optical device as claimed in claim 6, it is characterised in that: institute
Optical microstructures are stated for the optical microstructures based on pseudo-random sequence, the optical microstructures based on M sequence or based on Barker code
Optical microstructures.
9. a kind of realization system of flexible varied angle slot array diffraction optical device as claimed in claim 6, it is characterised in that: N
It is positive integer, the number of diffraction optical device unit included in the flexible varied angle slot array diffraction optical device of expression, N=1,
2,3 ... ∞, as N=1, the flexible varied angle slot array diffraction optical device inhibited for laser speckle is single diffraction light
Device cell is learned, includes the identical one-dimensional binary diffraction optics of structural parameters in m period in a diffraction optical device unit
Structure plan；As N≤2, the flexible varied angle slot array diffraction optical device inhibited for laser speckle is to include array
In N number of diffraction optical device unit；N number of diffraction optical device unit in the array is disposably produced on monolithic flexibility material
On material, the one-dimensional binary diffractive optical structure pattern inside N number of diffraction optical device unit in array is identical or not identical,
N group one-dimensional binary diffractive optical structure head and the tail connect, along X-direction by the head and N group of the 1st group of diffractive optical structure
The tail of diffractive optical structure is connected.
10. a kind of realization system of flexible varied angle slot array diffraction optical device as claimed in claim 9, it is characterised in that:
N number of diffraction optical device unit in array is different from inclination angle folded by X-axis, is expressed as, wherein,Indicate the amplitude of variation at inclination angle folded by neighboring diffraction optical device unit and X-axis.
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| US20130088723A1 (en) * | 2011-10-05 | 2013-04-11 | Daniel Feldkhun | Systems and methods for suppressing coherent structured illumination artifacts |
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| US20130088723A1 (en) * | 2011-10-05 | 2013-04-11 | Daniel Feldkhun | Systems and methods for suppressing coherent structured illumination artifacts |
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