CN106125445A - A kind of liquid crystal optical phased array diffraction efficiency optimizes system and method - Google Patents

Abstract

The invention discloses a kind of liquid crystal optical phased array diffraction efficiency and optimize system and method, it is specifically based on and pyrometric cone is reflected the collection that light is carried out, no matter how LCD phased array angle adjusts, can ensure that the main lobe hot spot reflecting light position in CCD front keeps constant, readjust the additive error that light path is brought, it is possible to collect the energy of major part graing lobe therefore, it is possible to can save simultaneously；And can be by calculating in the image that CCD gathers, main speckle and all main lobes and delete the ratio of lobe to calculate the diffraction efficiency of LCD phased array, carry out SPGD algorithm iteration, until the on-load voltage of all electrodes meets diffraction efficiency reaches maximum, it is capable of the efficient of LCD phased array diffraction efficiency, and energy rapid Optimum, the problem solving the existence of existing calm front detection system.

Description

A kind of liquid crystal optical phased array diffraction efficiency optimizes system and method

Technical field

The invention belongs to liquid crystal optoelectronic devices field, be specifically related to liquid crystal optical phased array technology.

Background technology

Liquid crystal optical phased array technology is the automatically controlled beam scanning technology of a kind of noninertia, multi-functional real-time programmable.Core Heart device is to use nematic liquid crystal as the electrooptical material of phase-modulation, has that driving voltage is low, phase modulation depth is big Physical characteristics, simultaneously device have lightweight, size is little, low in energy consumption and be easily achieved the advantages such as Controlled by micro computer circuit, not only Solve quickly the pointing to of laser beam, control flexibly and spacescan problem, and make the integrated level of electro-optical system higher, soft Property control ability is higher, manufacturing cost more cheap.But due to factors such as backhaul district, fabrication errors, liquid crystal optics phase can be caused Control battle array diffraction efficiency reduces, thus increases the Insertion Loss of system light path.

The method of liquid crystal optical phased array diffraction efficiency optimization is broadly divided into two classes, has the adaptive optics side of Wavefront detecting Method and the adaptive optics method without Wavefront detecting.

There is wavefront sensing methods: first load initial voltage code, obtain interference fringe by shear interference light path, utilize CCD camera typing striped, then uses wavefront reconstruction algorithm, solves wavefront from striped, then will actual measurement wavefront and ideal line Property inclined wave before compare, adjust voltage identification code so that actual measurement wavefront and ideal wavefront move closer to, and constantly carry out repeatedly In generation, the ripple control data finally giving optimum make before its prewave closest to preferable wavefront.

Without wave-front detection method: gather through hot spot in far field of the light beam of LCD phased array by CCD, by accordingly Stochastic Optimization Algorithms constantly adjusts voltage, and is iterated optimizing, until the beam diffraction efficiency that CCD collects is the highest.

Having Wave-front measurement system complicated due to light path, optics bore is limited, it is impossible to collects the light wave of spatial high-frequency, causes There is bigger error in wavefront inverting.Without wave-front detection method, in order to all gather all orders of diffraction time light in whole far field Speckle, generally requires and hot spot is irradiated to scattering surface (blank), then carries out view data with CCD and camera lens to whole and adopts Collection, but owing to large-area rescattering collection cannot ensure that the nephelometric turbidity unit of scattering surface is identical, and for different angles In the case of also have difference, therefore, the optical power distribution of rescattering can not practical laser power distribution of equal value, bring very to system Big error；If use direct lens to collect the way of diffraction light, it is possible to the beam position angle of optimization is limited to again mirror simultaneously The bore of head.

Summary of the invention

The problems referred to above existed for prior art, the diffraction efficiency that the present invention proposes a kind of liquid crystal optical phased array is excellent Change system.

The concrete technical scheme of the present invention is: the diffraction efficiency of a kind of liquid crystal optical phased array optimizes system, specifically includes: Laser instrument, polarization splitting prism, Faraday instrument, liquid crystal optical phased array, pyrometric cone, lens, CCD and control centre；Institute State control centre to include: controller and ripple control device；

Described laser instrument is connected to polarization splitting prism, the laser of described laser instrument output and the S light of polarization splitting prism Direction is consistent, and S polarisation is through Faraday instrument, and along optic path, polarization direction occurs 45 degree of rotations, postrotational light beam Vertically into liquid crystal optical phased array, and the polarization direction of incident laser is consistent with the optical axis direction of liquid crystal optical phased array；

Described pyrometric cone is placed on the main lobe spot center in far field after deflection, from described liquid crystal optical phased array swashing out Light after pyrometric cone reflects by backtracking LCD phased array, and after carrying out protecting partially process due to pyrometric cone, reflection light Polarization state does not changes, and reflection laser beam enters Faraday instrument, Faraday along backtracking, reflection light Instrument rotates 45 degree to the polarization direction of reflection light along optical transmission direction more counterclockwise, when therefore arriving polarization splitting prism, with Its P direction is consistent, passes through completely, enters fourier lense, and arrives the ccd detector at focal plane, is converted into the signal of telecommunication, passes Transport to the controller in control centre；

Described master controller optimizes voltage for carrying out the signal of telecommunication received processing to generate；

Described ripple control device, for the voltage identification code generated by master controller, is loaded in liquid crystal array controller by auspicious, Voltage identification code is converted into corresponding voltage by liquid crystal array controller again, is loaded on the electrode that liquid crystal optical phased array is corresponding, And be converted to laser signal transmission to pyrometric cone.

Diffraction efficiency based on above-mentioned liquid crystal optical phased array optimizes system, present invention also offers a kind of liquid crystal optics phase The diffraction efficiency optimization method of control battle array, specifically includes following steps:

Step S1. laser instrument is connected to polarization splitting prism, the laser of described laser instrument output and the S of polarization splitting prism Light direction is consistent, and S polarisation is through Faraday instrument, and along optic path, polarization direction occurs 45 degree of rotations, postrotational light Restraint vertically into liquid crystal optical phased array, and the optical axis direction one of the polarization direction of incident laser and liquid crystal optical phased array Cause；

The main lobe spot center in far field after pyrometric cone is placed on deflection described in step S2., from described liquid crystal optical phased array Laser out after pyrometric cone reflects by backtracking LCD phased array, and after carrying out protecting partially process due to pyrometric cone, The polarization state of reflection light does not changes, and reflection laser beam enters Faraday instrument, method along backtracking, reflection light Draw polariscope again along optical transmission direction, the polarization direction of reflection light to be rotated 45 degree counterclockwise, therefore arrive polarization spectro rib During mirror, consistent with its P direction, pass through completely, enter fourier lense, and arrive the ccd detector at focal plane, be converted into electricity Signal, transmits the controller to control centre；

Step S3. master controller processes and generates optimization voltage to the signal of telecommunication received；

The voltage identification code that master controller is generated by step S4. ripple control device, is loaded in liquid crystal array controller by auspicious, liquid Voltage identification code is converted into corresponding voltage by brilliant array control unit again, is loaded on the electrode that liquid crystal optical phased array is corresponding, and Be converted to laser signal transmission to pyrometric cone and through pyrometric cone reflect after by backtracking LCD phased array.

Further, the detailed process that the signal of telecommunication received is processed by step S3 is: master controller will collect View data is converted into gray-scale map, carries out Kalman filtering, then carries out medium filtering, by filtering by the disturbance of air and The noise filtering that CCD gathers, carries out self-adaption binaryzation by filtered result, obtains bianry image, carried out by bianry image Canny rim detection, calculates connected component, and the quantity obtaining connected component is the quantity of the hot spot that CCD collects, by calculating In each hot spot, the summation of each grey scale pixel value is as the energy of each hot spot, wherein, energy maximum for main lobe hot spot, its Remaining for graing lobe；

Diffraction efficiency is worth to by the ratio of calculating main lobe energy with all energy, and formula is:

$\mathrm{\η}=\frac{E_{main}}{E_{total}}$

Wherein, E_mainFor the energy of main lobe, E_totalSummation for main lobe Yu all collected secondary lobes:

$E_{main}=\underset{s}{\Σ}{\mathrm{gray}}_{i,j}(i,j)\∈s$

$E_{total}=\underset{s}{\Σ}{\mathrm{gray}}_{i,j}(i,j)\∈S$

Wherein, s is the region at main lobe place, and S is whole image, gray_i,jFor the gray value that its pixel coordinate is corresponding.

Further, step S3 generation optimization voltage idiographic flow is as follows:

S30. initializing, front electrode z=1, n=1, electrode voltage are μ_z ⁽ⁿ⁾；

S31. according to angle calculation magnitude of voltage μ to be deflected_z ⁽¹⁾, produce random voltages Δ μ simultaneously_z ⁽¹⁾；

S32. by magnitude of voltage μ_z ⁽¹⁾+Δμ_z ⁽¹⁾It is converted into voltage identification code, and is sent to liquid crystal optical phased array；

S33.CCD gathers image, filters and calculates J_z+ ⁽¹⁾；

S34. by magnitude of voltage μ_z ⁽¹⁾-Δμ_z ⁽¹⁾It is converted into voltage identification code, and is sent to liquid crystal optical phased array；

S35.CCD gathers image, filters and calculates J_z- ⁽¹⁾；

S36. difference DELTA J of twice evaluation result is calculated_z ⁽¹⁾=J_z+ ⁽¹⁾-J_z- ⁽¹⁾；

S37. voltage μ is calculated_z ⁽²⁾=μ_z ⁽¹⁾+γ·μ_z ⁽¹⁾·ΔJ_z ⁽¹⁾, magnitude of voltage is converted into voltage identification code, and sends, Until Δ J_z ⁽ⁿ⁾=0 magnitude of voltage stopping this electrode of iteration, this current electrode is the most optimized to be completed, and enters next electrode Iteration optimization.

Beneficial effects of the present invention: the diffraction efficiency of the liquid crystal optical phased array of the present invention optimizes system and method based on right The collection that the reflection light of pyrometric cone is carried out, no matter how LCD phased array angle adjusts, and can ensure to reflect the main lobe light of light Speckle position in CCD front keeps constant, readjusts, therefore, it is possible to can save, the additive error that light path is brought, it is possible to Time collect major part graing lobe energy；And can be by calculating in the image that CCD gathers, main speckle and all main lobes and the ratio deleting lobe Value calculates the diffraction efficiency of LCD phased array, carries out SPGD algorithm iteration, until the on-load voltage of all electrodes meets diffraction Efficiency reaches maximum, it is possible to realize the efficient of LCD phased array diffraction efficiency, and can rapid Optimum, solve existing calm before The problem of the existence of detection system.

Accompanying drawing explanation

Fig. 1 is that liquid crystal optical phased array diffraction efficiency optimizes system architecture diagram.

The hot spot schematic diagram that Fig. 2 liquid crystal optical phased array efficiency optimization system CCD gathers.

The image processing flow figure of Fig. 3 liquid crystal optical phased array efficiency optimization system.

The SPGD algorithm process flow chart of Fig. 4 liquid crystal optical phased array efficiency optimization system.

Detailed description of the invention

Below in conjunction with the accompanying drawings embodiments of the invention are described further.

As it is shown in figure 1, the invention provides one to realize liquid crystal optical phased array efficiency optimization system, specifically include: swash Light device, polarization splitting prism, Faraday instrument, liquid crystal optical phased array, pyrometric cone, lens, CCD and control centre；Described Control centre includes: controller and ripple control device；

Described laser instrument is connected to polarization splitting prism, the laser of described laser instrument output and the S light of polarization splitting prism Direction is consistent, and S polarisation is through Faraday instrument, and along optic path, polarization direction occurs 45 degree of rotations, postrotational light beam Vertically into liquid crystal optical phased array, and the polarization direction of incident laser is consistent with the optical axis direction of liquid crystal optical phased array.

Here the choosing of laser wavelength, depends on the operation wavelength of the LCD phased array that needs test.

Described pyrometric cone is placed on the main lobe spot center in far field after deflection, from described liquid crystal optical phased array swashing out Light after pyrometric cone reflects by backtracking LCD phased array, and after carrying out protecting partially process due to pyrometric cone, reflection light Polarization state does not changes, and reflection laser beam enters Faraday instrument, Faraday along backtracking, reflection light Instrument rotates 45 degree to the polarization direction of reflection light along optical transmission direction more counterclockwise, when therefore arriving polarization splitting prism, with Its P direction is consistent, passes through completely, enters fourier lense, and arrives the ccd detector (see Fig. 2) at focal plane, is converted into electricity Signal, transmits the controller to control centre.CCD can use general ccd image sensor, does not has bore and resolution There is particularly severe requirement.

Described master controller optimizes voltage for carrying out the signal of telecommunication received processing to generate；

Described ripple control device, for the voltage identification code generated by master controller, is loaded in liquid crystal array controller by auspicious, Voltage identification code is converted into corresponding voltage by liquid crystal array controller again, is loaded on the electrode that liquid crystal optical phased array is corresponding, And be converted to laser signal transmission to pyrometric cone.

It can be seen that the image that the Data Source optimized gathers in CCD, calculate spreading out of liquid crystal optical phased array by image Penetrate efficiency, thus provide the Appreciation gist of performance for optimizing of SPGD algorithm.Voltage after SPGD algorithm will optimize is converted into liquid The voltage identification code that brilliant optical phased array array control unit can identify.

The diffraction efficiency optimization method of liquid crystal optical phased array that the present invention provides, specifically includes following steps:

Step S1. laser instrument is connected to polarization splitting prism, the laser of described laser instrument output and the S of polarization splitting prism Light direction is consistent, and S polarisation is through Faraday instrument, and along optic path, polarization direction occurs 45 degree of rotations, postrotational light Restraint vertically into liquid crystal optical phased array, and the optical axis direction one of the polarization direction of incident laser and liquid crystal optical phased array Cause.

After liquid crystal optical phased array, there is angular deflection in beam Propagation direction, wherein, deflection angle is by liquid The ripple control data of brilliant optical phased array determine, and ripple control data are then the physical quantitys that native system is to be optimized.

The main lobe spot center in far field after pyrometric cone is placed on deflection described in step S2., from described liquid crystal optical phased array Laser out after pyrometric cone reflects by backtracking LCD phased array, and after carrying out protecting partially process due to pyrometric cone, The polarization state of reflection light does not changes, and reflection laser beam enters Faraday instrument, method along backtracking, reflection light Draw polariscope again along optical transmission direction, the polarization direction of reflection light to be rotated 45 degree counterclockwise, therefore arrive polarization spectro rib During mirror, consistent with its P direction, pass through completely, enter fourier lense, and arrive the ccd detector at focal plane, be converted into electricity Signal, transmits the controller to control centre.

Due to defective workmanship and the existence in backhaul district of liquid crystal optical phased array, phase shift is caused to be distributed and non-ideal, at it Far-field region is formed in addition to main lobe, there is also graing lobe at other period positions.Phase-Shifting Characteristics reversible due to phased array Characteristic, now reflection light is after liquid crystal optical phased array, and main lobe direction is with the angle of vertical liquid crystal optical phased array, it may be assumed that 0 ° of direction of systematic optical axis, as shown in Figure 1；And the angle that this optical signature is loaded with liquid crystal optical phased array is unrelated.

Liquid crystal optical phased array is when loading the ripple control data being differently directed angle, and the main lobe of reflection light beam is in all the time The center of CCD, and the spacing of graing lobe is the angle of ripple control, for device in the case of different beams points to, optimize system without Need to carry out complex optical path again to adjust.

Step S3. master controller processes and generates optimization voltage to the signal of telecommunication received；

The voltage identification code that master controller is generated by step S4. ripple control device, is loaded in liquid crystal array controller by auspicious, liquid Voltage identification code is converted into corresponding voltage by brilliant array control unit again, is loaded on the electrode that liquid crystal optical phased array is corresponding, and Be converted to laser signal transmission to pyrometric cone and through pyrometric cone reflect after by backtracking LCD phased array.

Here the detailed process that the signal of telecommunication received is processed by step S3 is: the picture number that master controller will collect According to being converted into gray-scale map, carry out Kalman filtering, then carry out medium filtering, by filtering, disturbance and the CCD of air are gathered Noise filtering, filtered result is carried out self-adaption binaryzation, obtains bianry image, bianry image is carried out canny limit Edge detects, and calculates connected component, and the quantity obtaining connected component is the quantity of the hot spot that CCD collects, by calculating each light In speckle, the summation of each grey scale pixel value is as the energy of each hot spot, wherein, energy maximum for main lobe hot spot, remaining is Graing lobe；The collection of diffraction pattern is carried out, by the main lobe hot spot collected and all main lobes and the ratio conduct deleting lobe by CCD The evaluation function of SPGD algorithm.The most as shown in Figure 3:

Diffraction efficiency is worth to by the ratio of calculating main lobe energy with all energy, and formula is:

$\mathrm{\η}=\frac{E_{main}}{E_{total}}---\left(1\right)$

Wherein, E_mainFor the energy of main lobe, E_totalSummation for main lobe Yu all collected secondary lobes.

$E=\underset{s}{\Σ}{\mathrm{gray}}_{i,j}(i,j)\∈s---\left(2\right)$

Wherein, s is the region gray at light lobe place_i,jFor the gray value that its pixel coordinate is corresponding.

Generate and optimize voltage course SPGD to be used (stochastic parallel gradient descent) algorithm, especially by each electricity The ripple control data of pole carry out iteration optimization one by one, the theoretical formula of SPGD algorithm:

${\mathrm{\μ}}_z^{(n+1)}={\mathrm{\μ}}_z^{\left(1\right)}+{\mathrm{\γ\Δ\μ}}_z^{\left(n\right)}{\mathrm{\ΔJ}}_z^{\left(n\right)}---\left(3\right)$

J_z ⁽ⁿ⁾=η⁽ⁿ⁾ (4)

ΔJ_z ⁿ=J_z+ ⁽ⁿ⁾-J_z ⁽ⁿ⁾ (5)

In formula: z is LCD phased array element antenna sequence number, μ_z ⁽ⁿ⁾={ μ_z1 ⁽ⁿ⁾,...,μ_zj ⁽ⁿ⁾, μ_zN ⁽ⁿ⁾And μ_z ⁽ⁿ⁺¹⁾= {μ_z1 ⁽ⁿ⁺¹⁾,...,μ_zj ⁽ⁿ⁺¹⁾,μ_zN ⁽ⁿ⁺¹⁾Be respectively n-th and be applied to liquid crystal optical phased array during (n+1)th iterative Correction voltage vector in N number of driver, wherein μ_zk ⁽ⁿ⁾Represent n-th and be loaded into the voltage of kth electrode；γ is that gain is normal Number；Δμ_z ⁽ⁿ⁾={ Δ μ_z1 ⁽ⁿ⁾,...,Δμ_zj ⁽ⁿ⁾,Δμ_zN ⁽ⁿ⁾The random disturbance electricity that applies on each electrode when being nth iteration The amount of pressing to, wherein, Δ μ_zk ⁽ⁿ⁾Represent n-th and be loaded into the kth electrode voltage variable quantity compared to last time, each separate and Being all Bernoulli Jacob's distribution, the amplitude of the most each component is equal | μ_zj|=σ Pr (Δ μ_zj=± σ)=0.5, wherein Δ μ_zkFor being loaded into The distribution function of the voltage on kth electrode.

System performance metric:

$\mathrm{\Δ}{J_z}^{\left(n\right)}={\mathrm{\η}}_{{(z}^{+})}-{\mathrm{\η}}_{\left(z^{-}\right)}$

Wherein,The voltage loaded for liquid crystal optical phased array is μ_z ⁽ⁿ⁾+Δμ_z ⁽ⁿ⁾Time diffraction efficiency,For liquid crystal light The voltage learning phased array loading is μ_z ⁽ⁿ⁾-Δμ_z ⁽ⁿ⁾Time diffraction efficiency.

Such as the execution flow chart of SPGD algorithm that Fig. 4 is embodiment of the present invention liquid crystal optical phased array efficiency optimization system, The execution flow process of SPGD algorithm is as follows:

Idiographic flow is as follows:

S30. initializing, front electrode z=1, n=1, electrode voltage are μ_z ⁽ⁿ⁾；

S31. according to angle calculation magnitude of voltage μ to be deflected_z ⁽¹⁾, produce random voltages Δ μ simultaneously_z ⁽¹⁾；

S32. by magnitude of voltage μ_z ⁽¹⁾+Δμ_z ⁽¹⁾It is converted into voltage identification code, and is sent to liquid crystal optical phased array；

S33.CCD gathers image, filters and calculates J_z+ ⁽¹⁾；

S34. by magnitude of voltage μ_z ⁽¹⁾-Δμ_z ⁽¹⁾It is converted into voltage identification code, and is sent to liquid crystal optical phased array；

S35.CCD gathers image, filters and calculates J_z- ⁽¹⁾；

S36. difference DELTA J of twice evaluation result is calculated_z ⁽¹⁾=J_z+ ⁽¹⁾-J_z- ⁽¹⁾；

S37. voltage μ is calculated_z ⁽²⁾=μ_z ⁽¹⁾+γ·μ_z ⁽¹⁾·ΔJ_z ⁽¹⁾, magnitude of voltage is converted into voltage identification code, and sends, Until Δ J_z ⁽ⁿ⁾=0 magnitude of voltage stopping this electrode of iteration, this current electrode is the most optimized to be completed, and enters next electrode Iteration optimization.The optimization of each electrode such as flow process above, until all of electrode optimization completes.

It can be seen that the system and method that the present embodiment provides, the laser beam that laser instrument sends is by LCD phased array After deflection, pyrometric cone laser is reflected along former road, then via LCD phased array, angular deflection is returned, it is ensured that no matter liquid How brilliant phased array deflects, the light reflected, and its main lobe hot spot position in CCD keeps constant, is calculated by SPGD simultaneously Method carries out efficiency iterative computation to gathering the light beam returned, until the on-load voltage of all electrodes meets diffraction efficiency and reaches maximum Value, it is possible to realize the efficient of LCD phased array diffraction efficiency, and can rapid Optimum.

Claims (4)

1. the diffraction efficiency of liquid crystal optical phased array optimizes a system, specifically includes: laser instrument, polarization splitting prism, farad Polariscope, liquid crystal optical phased array, pyrometric cone, lens, CCD and control centre；Described control centre includes: controller and ripple Control device；

Described laser instrument is connected to polarization splitting prism, the laser of described laser instrument output and the S light direction of polarization splitting prism Unanimously, S polarisation is through Faraday instrument, and along optic path, polarization direction occurs 45 degree of rotations, postrotational beam orthogonal Enter liquid crystal optical phased array, and the polarization direction of incident laser is consistent with the optical axis direction of liquid crystal optical phased array；

Described pyrometric cone is placed on the main lobe spot center in far field after deflection, from described liquid crystal optical phased array laser warp out Cross after pyrometric cone reflection by backtracking LCD phased array, and after carrying out protecting partially process due to pyrometric cone, the polarization of reflection light State does not changes, and reflection laser beam enters Faraday instrument along backtracking, reflection light, and Faraday instrument is again The polarization direction of reflection light is rotated 45 degree counterclockwise along optical transmission direction, when therefore arriving polarization splitting prism, with its P side To unanimously, passing through completely, enter fourier lense, and arrive the ccd detector at focal plane, be converted into the signal of telecommunication, transmission is extremely Controller in control centre；

Described master controller optimizes voltage for carrying out the signal of telecommunication received processing to generate；

Described ripple control device, for the voltage identification code generated by master controller, is loaded in liquid crystal array controller by auspicious, liquid crystal Voltage identification code is converted into corresponding voltage by array control unit again, is loaded on the electrode that liquid crystal optical phased array is corresponding, and turns It is changed to laser signal transmission to pyrometric cone.

2. a diffraction efficiency optimization method for liquid crystal optical phased array, specifically includes following steps:

Step S1. laser instrument is connected to polarization splitting prism, the laser of described laser instrument output and the S light side of polarization splitting prism To unanimously, S polarisation is through Faraday instrument, and along optic path, polarization direction occurs 45 degree of rotations, and postrotational light beam hangs down Straight enter liquid crystal optical phased array, and the polarization direction of incident laser is consistent with the optical axis direction of liquid crystal optical phased array；

The main lobe spot center in far field after pyrometric cone is placed on deflection described in step S2., from described liquid crystal optical phased array out Laser after pyrometric cone reflects by backtracking LCD phased array, and after carrying out protecting partially process due to pyrometric cone, reflection The polarization state of light does not changes, and reflection laser beam enters Faraday instrument, faraday along backtracking, reflection light Polariscope rotates 45 degree to the polarization direction of reflection light along optical transmission direction more counterclockwise, therefore arrives polarization splitting prism Time, consistent with its P direction, pass through completely, enter fourier lense, and arrive the ccd detector at focal plane, be converted into telecommunications Number, transmit the controller to control centre；

Step S3. master controller processes and generates optimization voltage to the signal of telecommunication received；

The voltage identification code that master controller is generated by step S4. ripple control device, is loaded in liquid crystal array controller by auspicious, liquid crystal battle array Voltage identification code is converted into corresponding voltage by row controller again, is loaded on the electrode that liquid crystal optical phased array is corresponding, and changes For laser signal transmission to pyrometric cone and through pyrometric cone reflect after by backtracking LCD phased array.

The diffraction efficiency optimization method of a kind of liquid crystal optical phased array the most according to claim 1, it is characterised in that step The detailed process that the signal of telecommunication received is processed by S3 is: the view data collected is converted into gray-scale map by master controller, Carry out Kalman filtering, then carry out medium filtering, noise filtering disturbance and the CCD of air gathered by filtering, will filter Result after ripple carries out self-adaption binaryzation, obtains bianry image, and bianry image is carried out canny rim detection, the company of calculating Entire body, the quantity obtaining connected component is the quantity of the hot spot that CCD collects, by each pixel grey scale in each hot spot of calculating The summation of value is as the energy of each hot spot, wherein, energy maximum for main lobe hot spot, remaining is graing lobe；

Diffraction efficiency is worth to by the ratio of calculating main lobe energy with all energy, and formula is:

$\mathrm{\η}=\frac{E_{main}}{E_{total}}$

Wherein, E_mainFor the energy of main lobe, E_totalSummation for main lobe Yu all collected secondary lobes:

$E_{main}=\underset{s}{\Σ}{\mathrm{gray}}_{i,j},(i,j)\∈s$

$E_{total}=\underset{s}{\Σ}{\mathrm{gray}}_{i,j},(i,j)\∈S$

Wherein, s is the region at main lobe place, and S is whole image, gray_i,jFor the gray value that its pixel coordinate is corresponding.

The diffraction efficiency optimization method of a kind of liquid crystal optical phased array the most according to claim 3, it is characterised in that step It is as follows that S3 generates optimization voltage idiographic flow:

S30. initializing, front electrode z=1, n=1, electrode voltage are μ_z ⁽ⁿ⁾；

S31. according to angle calculation magnitude of voltage μ to be deflected_z ⁽¹⁾, produce random voltages Δ μ simultaneously_z ⁽¹⁾；

S32. by magnitude of voltage μ_z ⁽¹⁾+Δμ_z ⁽¹⁾It is converted into voltage identification code, and is sent to liquid crystal optical phased array；

S33.CCD gathers image, filters and calculates J_z+ ⁽¹⁾；

S34. by magnitude of voltage μ_z ⁽¹⁾-Δμ_z ⁽¹⁾It is converted into voltage identification code, and is sent to liquid crystal optical phased array；

S35.CCD gathers image, filters and calculates J_z- ⁽¹⁾；

S36. difference DELTA J of twice evaluation result is calculated_z ⁽¹⁾=J_z+ ⁽¹⁾-J_z-(¹)；

S37. voltage μ is calculated_z ⁽²⁾=μ_z ⁽¹⁾+γ·μ_z ⁽¹⁾·ΔJ_z ⁽¹⁾, magnitude of voltage is converted into voltage identification code, and sends, until ΔJ_z ⁽ⁿ⁾=0 magnitude of voltage stopping this electrode of iteration, this current electrode is the most optimized to be completed, and enters changing of next electrode In generation, optimizes.