Method for eliminating color difference of twisting type liquid crystal wave-front corrector

The invention belongs to the field of adaptive optical technique and relates to a method for eliminating the chromatic aberration of a twisted liquid crystal-based wave-front corrector. During the process of wave surface correction with the twisted liquid crystal-based wave-front corrector, the light polarization of the liquid crystal layer may change and a part of the light emerges without correction, and the correction effect is poor. In order to filter the non-corrected stray light, a liquid crystal blazed grating is applied to the twisted liquid crystal-based wave-front corrector based on Kinoform, to allow the polarized light corrected by the liquid crystal layer to diffract in the blazing direction and to filter off the non-corrected stray light. But after applying the blazed grating to the twisted liquid crystal-based wave-front corrector, light beams of different wavelengths may be dispersed in the liquid crystal layer due to the difference in refractive index, producing images ...

Universal liquid crystal adaptive aberration correcting retina imaging system

The invention belongs to the technical field of microscope imaging, relates to a high-order aberration correcting optical design for high-ametropia human eyes, and discloses a universal liquid crystal adaptive aberration correcting retina imaging system. An LCD screen is adopted for displaying a sighting target point light source, and the sighting target is designed into an E shape so that the self-adjusting effect of visibility is enhanced; and meanwhile, E-shaped micro displacement is easily controlled on the LCD screen so that the position of an imaging area can be quantitatively changed. Through the sign of a plurality of key devices, the universality of the liquid crystal adaptive system in fundus imaging is improved, the problem of difficult clear imaging of the fundus adaptive imaging technology under the condition of over 800-degree myopia or 200-degree astigmatism can be solved, and the system can acquire a high-resolution retina image on the human eye of 200-degree astigmatism ...

Ferrite substrate cleaning technology method based on neutral solution

The invention relates to the field of micromachining, in particular to a ferrite substrate cleaning technology based on a neutral solution. The technology includes the following steps that a substrate side and a non-exposed face are ground, a substrate is horizontally placed in an utensil, a cleaning agent is used for carrying out ultrasonic treatment on the substrate in an ultrasonic cleaning machine; the substrate is placed in a ceramic crucible and flushed with hot water; microcleaning is carried out on the surface of the substrate. The ferrite substrate cleaning technology based on the neutral solution has the advantages that impurities such as oil contamination can be effectively removed, reaction with the ferrite substrate does not exist, in addition, alcohol and ketone anhydrous organic solvents are easy to recycle and the environment will not be polluted.

Adaptive liquid crystal optical system capable of opening loop and closing loop

The invention belongs to the adaptive optical field and discloses an adaptive liquid crystal optical system capable of switching between an open loop adaptive correction function and a close loop adaptive correction function, relating to the combination of optical elements, such as a liquid crystal corrector, a wavefront detector, a wave plate, a PBS beam splitter and the like. The invention provides an adaptive liquid crystal optical system capable of opening loop, which has simple operation, low resetting difficulty and favourable stability and has the close loop adaptive correction mode. The system adopts the PBS beam splitter to replace a common polaroid, so that the adaptive liquid crystal optical system has high energy utilization ratio; as the PBS performs polarized beam splitting after being arranged in the liquid crystal corrector and is combined with an optical rotation mechanism, a detection corrector does not need to rotate PBS during response matrix, avoiding the optical axis ...

Preparation method for magnetic tunnel junction thin film capable of improving magneto-resistive effect

The invention relates to a preparation method for a magnetic tunnel junction (MTJ) thin film and discloses a preparation method for the MTJ thin film capable of improving a giant magneto-resistive effect. The preparation method comprises the following steps: (a) depositing a bottom electrode layer, an anti-ferromagnetic layer, a pinning ferromagnetic layer, a tunneling layer and a free ferromagnetic layer in sequence on a substrate; (b) performing annealing process treatment on the prepared bottom electrode layer, anti-ferromagnetic layer, pinning ferromagnetic layer, tunneling layer and free ferromagnetic layer; (c) after finishing the annealing process treatment, depositing a top electrode layer. The preparation method has the benefits that a magnetic random access memory is widely applied to the fields of military, civil and the like and adopts a magnetic tunnel junction structure with the magneto-resistive effect, and in order to further increase the memory density of the magnetic random ...

Quick directional column type LCD self-adapting optical system

The invention belongs to the adaptive optics field, which is a rapid nematic liquid crystal adaptive optics system and comprises a PBS light beam splitter, a first lens, a second lens, a wave front detector, a third lens, a forth lens, an LCOS screen, reflectors, a fifth lens, a sixth lens, a CCD camera and a computer; wherein, the PBS light beam splitter is a light beam splitter which can separate the P polarized component and the S polarized component in the natural light. The first lens and the second lens are arranged between the PBS light beam splitter and the wave front detector, and thethird lens and the forth lens are arranged between the PBS light beam splitter and the LCOS screen. A reflector is respectively positioned between the third lens and the forth lens and on a reflection optical path focus. The fifth lens and the sixth lens are orderly arranged between the reflector and the CCD camera. The wave front detector, the LCOS screen and CCD camera are all connected with the ...

Liquid crystal adaptive retinal imaging optical system for aberration correction with self-regulating visibility

The invention belongs to the technical field of adaptive optical imaging, relates to high-resolution imaging designs of retinas of high myopic eyes, and provides a liquid crystal adaptive retinal imaging optical system for aberration correction with self-regulating visibility. The optical system consists of a visibility adjusting subsystem, an eyeground illumination subsystem, and an adaptive imaging correction subsystem. An optotype point light source and an eyeground lighting point light source are imaged at a visible position in front of eyes through an optical design to stably obtain high-resolution retinal imaging of myopic eyes of over 800 degrees. The myopic aberration of the eyes is greatly reduced by using the self-regulating ability generated by the eyes by staring at the optotype at the visible position, so that the residual aberration depth meets the correction capability of a liquid crystal corrector, and the correcting range of a liquid crystal adaptive system is increased ...

Optimized distribution method for energy of liquid crystal adaptive optical system

The invention belongs to the field of adaptive optics and relates to an optimized distribution method for light energy between a corrosion imaging subcircuit and a wavefront sensing subcircuit in a liquid crystal adaptive optical system. The basic thought of the method is that: the polarizing beam splitting design of the sensing subcircuit and the corrosion imaging subcircuit is changed into spectrophotometry; a beam splitting wavelength is calculated according to a response signal intensity ratio of the receiving terminal devices of the two subcircuits, which is 1:1; the light energy of a wide short wave band with dispersion and a high wave front distortion change speed is distributed to the sensing subcircuit and the light energy of a narrow long wave band without dispersion and with a low wave front distortion change speed is distributed to the correction imaging subcircuit; light in the correction imaging subcircuit is split into two paths of polarized light by using a polarizing beam ...

Liquid crystal adaptive aberration correction retinal imaging device with high-efficiency utilization of energy

The invention belongs to the technical field of adaptive optical imaging, and relates to an optical design of high resolution imaging of fundus oculi retina, which is a liquid crystal adaptive aberration correction retinal imaging device with high-efficiency utilization of energy. The imaging device is characterized in that a polarizing beam splitter prism which is normally arranged on a front light path of a liquid crystal corrector is moved to be behind the liquid crystal corrector; a beam splitter with a high transmission-reflection ratio is arranged at the position where the polarizing beam splitter prism is originally positioned; an annular diaphragm is inserted to shield the light vertically entering human eyes, so interference light directly reflected by a front cornea is basicallyeliminated. The polarizing beam splitter prism is placed corresponding to an e-light polarization direction of the liquid crystal corrector; the corrected e-light is separated from non-corrected o-light ...

Speed reducer and vehicle

The invention provides a speed reducer and a vehicle. The speed reducer comprises a reduction gear, a differential mechanism and an oil collecting part, a mounting structure and a first assembling space located on the first side of the mounting structure are arranged in the reduction gear, the differential mechanism comprises a first part located in the first assembling space, the first part is provided with an oil inlet, and the oil collecting part is assembled to the mounting structure and located in the first assembling space; the oil collecting piece is provided with an oil collecting space, and the oil collecting space communicates with the oil inlet and an oil storage space in the speed reducer. The oil collecting piece can directly collect lubricating oil from the oil storage space in the speed reducer through the oil collecting space, and the lubricating oil enters the differential mechanism through the oil inlet. The amount of lubricating oil entering the differential mechanism ...

Universal liquid crystal adaptive aberration correcting retina imaging system

The invention belongs to the technical field of microscope imaging, relates to a high-order aberration correcting optical design for high-ametropia human eyes, and discloses a universal liquid crystal adaptive aberration correcting retina imaging system. An LCD screen is adopted for displaying a sighting target point light source, and the sighting target is designed into an E shape so that the self-adjusting effect of visibility is enhanced; and meanwhile, E-shaped micro displacement is easily controlled on the LCD screen so that the position of an imaging area can be quantitatively changed. Through the sign of a plurality of key devices, the universality of the liquid crystal adaptive system in fundus imaging is improved, the problem of difficult clear imaging of the fundus adaptive imaging technology under the condition of over 800-degree myopia or 200-degree astigmatism can be solved, and the system can acquire a high-resolution retina image on the human eye of 200-degree astigmatism ...

Liquid crystal adaptive aberration correction retinal imaging device with high-efficiency utilization of energy

The invention belongs to the technical field of adaptive optical imaging, and relates to an optical design of high resolution imaging of fundus oculi retina, which is a liquid crystal adaptive aberration correction retinal imaging device with high-efficiency utilization of energy. The imaging device is characterized in that a polarizing beam splitter prism which is normally arranged on a front light path of a liquid crystal corrector is moved to be behind the liquid crystal corrector; a beam splitter with a high transmission-reflection ratio is arranged at the position where the polarizing beam splitter prism is originally positioned; an annular diaphragm is inserted to shield the light vertically entering human eyes, so interference light directly reflected by a front cornea is basically eliminated. The polarizing beam splitter prism is placed corresponding to an e-light polarization direction of the liquid crystal corrector; the corrected e-light is separated from non-corrected o-light ...

Molecular design and mixing formula of quick liquid crystal material for liquid crystal wavefront corrector

The invention belongs to the field of liquid crystal material preparation and relates to a molecular design and a mixing formula of a low-viscosity and quick-response liquid crystal material for a liquid crystal wavefront corrector. The molecular design is characterized in that eight compounds such as high-detaln isothiocyanate liquid crystals and low-viscosity polyvinylidene floride liquid crystals are mixed according to certain weight percentage, and a mixed liquid crystal material of which the detaln value is 0.32-0.40 and the nematic phase temperature range is larger than 25-100 DEG C is obtained by heating and uniform mixing; the liquid crystal material is prepared into a reflection type parallel arranged liquid crystal box which is a single-pixel liquid crystal wavefront corrector; the thickness of a liquid crystal layer is controlled between 1.6 microns and 2.0 microns, so that the phase modulation amount is 785 nm larger than a wavelength; under the driving of voltage of 5 V at ...

Light beam folding type liquid crystal adaptive optical imaging system

The invention belongs to the field of adaptive optics, and discloses a method for designing a light beam folding type liquid crystal adaptive optical imaging system. As is shown in figure 1, a plurality of off-axis parabolic mirrors and reflectors are introduced and combined to fold light beams many times, and the size of the system is reduced. Due to the fact that a Hartmann detector and a liquid crystal corrector are under feedforward control, the feedforward control should be switched into feedback control when signal measurement is responded, the fourth off-axis parabolic mirror 13 is removed out of a light path, emergent parallel light beams aligned to the third off-axis parabolic mirror 12 are inserted into the fifth reflector 18 which is arranged by 45 degrees in a detection branch, light beams passing through the liquid crystal corrector 10 enter the Hartmann wavefront detector 17 after axis folding, light beams emitted out of a third lens 16 are cut off, and meanwhile a fast galvanometer ...

Polarized light energy loss-free liquid crystal self-adaptive optical system

Optimized distribution method for energy of liquid crystal adaptive optical system

The invention belongs to the field of adaptive optics and relates to an optimized distribution method for light energy between a corrosion imaging subcircuit and a wavefront sensing subcircuit in a liquid crystal adaptive optical system. The basic thought of the method is that: the polarizing beam splitting design of the sensing subcircuit and the corrosion imaging subcircuit is changed into spectrophotometry; a beam splitting wavelength is calculated according to a response signal intensity ratio of the receiving terminal devices of the two subcircuits, which is 1:1; the light energy of a wide short wave band with dispersion and a high wave front distortion change speed is distributed to the sensing subcircuit and the light energy of a narrow long wave band without dispersion and with a low wave front distortion change speed is distributed to the correction imaging subcircuit; light in the correction imaging subcircuit is split into two paths of polarized light by using a polarizing beam ...

Adaptive liquid crystal optical system capable of opening loop and closing loop

The invention belongs to the adaptive optical field and discloses an adaptive liquid crystal optical system capable of switching between an open loop adaptive correction function and a close loop adaptive correction function, relating to the combination of optical elements, such as a liquid crystal corrector, a wavefront detector, a wave plate, a PBS beam splitter and the like. The invention provides an adaptive liquid crystal optical system capable of opening loop, which has simple operation, low resetting difficulty and favourable stability and has the close loop adaptive correction mode. The system adopts the PBS beam splitter to replace a common polaroid, so that the adaptive liquid crystal optical system has high energy utilization ratio; as the PBS performs polarized beam splitting after being arranged in the liquid crystal corrector and is combined with an optical rotation mechanism, a detection corrector does not need to rotate PBS during response matrix, avoiding the optical axis ...

Polarized light energy loss-free liquid crystal self-adaptive optical system

Method for designing light beam folding type liquid crystal adaptive optical system

The invention belongs to the field of adaptive optics, and discloses a method for designing a light beam folding type liquid crystal adaptive optical system. As is shown in figure 1, a plurality of off-axis parabolic mirrors and reflectors are introduced and combined to fold light beams many times, and the size of the system is reduced. Due to the fact that a Hartmann detector and a liquid crystal corrector are under feedforward control, the feedforward control should be switched into feedback control when signal measurement is responded, the fourth off-axis parabolic mirror 13 is removed out of a light path, emergent parallel light beams aligned to the third off-axis parabolic mirror 12 are inserted into the fifth reflector 18 which is arranged by 45 degrees in a detection branch, light beams passing through the liquid crystal corrector 10 enter the Hartmann wavefront detector 17 after axis folding, light beams emitted out of a third lens 16 are cut off, and meanwhile a fast galvanometer ...

Service detection method and device

The invention provides a service detection method and device, and the method comprises the steps: detecting a participation mode of a target service, and determining a duration threshold value corresponding to the participation mode; under the condition that the participation duration of participating in the target service reaches the duration threshold value, adjusting the execution state of the target service, and displaying participation reminding information; and detecting an operation state of the participation reminding information, processing the target service according to a detection result, and updating the duration threshold.

TFT liquid crystal overfall simulator with time and space continuity

The utility model relates to a pure phase liquid crystal turbulence simulator, belonging to optical technical field, which comprises a TFT liquid crystal screen, a polaroid sheet, a drive module and a computer with a turbulence wave surface computing software. The computing software is designed as below: item number n of Zernike is confirmed firstly; the expression is n3/2=0.2944x(L/r0)5/3 Deltan; wherein, L, r0 and Deltan are scale, turbulence coherent length and simulated root mean square error of simulated turbulence section separately; coefficient is calculated using covariance matrix method of n coefficient algebra; effective lattice point number m of wave surface is confirmed using m=(8L/r0)2 and is brought into Zernike multinomial expression for calculating phase distribution on wave surface, making the giant wave surface cut over light beam at even speed and getting time and space continuous dynamic turbulence wavefront on the light beam section. Turbulence software is used todrive ...

TFT liquid crystal overfall simulator with time and space continuity

The utility model relates to a pure phase liquid crystal turbulence simulator, belonging to optical technical field, which comprises a TFT liquid crystal screen, a polaroid sheet, a drive module and a computer with a turbulence wave surface computing software. The computing software is designed as below: item number n of Zernike is confirmed firstly; the expression is n3/2=0.2944x(L/r0)5/3 Deltan; wherein, L, r0 and Deltan are scale, turbulence coherent length and simulated root mean square error of simulated turbulence section separately; coefficient is calculated using covariance matrix method of n coefficient algebra; effective lattice point number m of wave surface is confirmed using m=(8L/r0)2 and is brought into Zernike multinomial expression for calculating phase distribution on wave surface, making the giant wave surface cut over light beam at even speed and getting time and space continuous dynamic turbulence wavefront on the light beam section. Turbulence software is used to drive ...

White light LCD self-adapting optic system

The invention relates to the adaptive optical field, in particular to a liquid crystal adaptive optical system with low energy loss and covering white-light wave band, which adopts an open-loop adaptive light path and substitutes the common polaroid with a PBS beam splitter. The PBS beam splitter splits the incoming ray into two rays of P polarization and S polarization, in which P ray is completely used for the wavefront detection and S ray is completely used for correction and imaging. Before the correction, the S ray is divided into 3 to 4 sub-bands by using color-separation plates; 3 to 4 liquid crystal correctors are correspondingly arranged to perform wavefront correction; the corrected 3 to 4 sub-beams are combined into one imaging beam. The invention uses the PBS beam splitter to substitute the common polaroids, doubling the efficiency of energy utilization in the liquid crystal adaptive optical system. With a plurality of pure-phase liquid crystal wavefront correctors, the invention ...

Fast wave-front reconstruction method applied to liquid crystal adaptive optical system

The invention belongs to the technical field of adaptive optics and relates to data transmission from an optical wave-front detection signal of an atmospheric channel to a phase digital signal and calculation, in particular to a fast wave-front reconstruction method applied to a liquid crystal adaptive optical system. The method comprises the following steps of: dividing a Zernike model matrix into four sub-matrixes according to four quadrants by using a parity of a Zernike model; selecting one of the sub-matrixes as a root matrix, memorizing the root matrix into a memory, and determining a conversion relationship between the root matrix and other three sub-matrixes; and then reading the root matrix which is pre-memorized in the memory into a shared memory of a graphic processing unit (GPU), and performing matrix multiplication on the root matrix and column vectors of a measured unknown wave-front Zernike model coefficient, to reconstruct phase wave-front corresponding to a pixel planar ...

Quick directional column type LCD self-adapting optical system

Liquid crystal adaptive retinal imaging optical system for aberration correction with self-regulating visibility

The invention belongs to the technical field of adaptive optical imaging, relates to high-resolution imaging designs of retinas of high myopic eyes, and provides a liquid crystal adaptive retinal imaging optical system for aberration correction with self-regulating visibility. The optical system consists of a visibility adjusting subsystem, an eyeground illumination subsystem, and an adaptive imaging correction subsystem. An optotype point light source and an eyeground lighting point light source are imaged at a visible position in front of eyes through an optical design to stably obtain high-resolution retinal imaging of myopic eyes of over 800 degrees. The myopic aberration of the eyes is greatly reduced by using the self-regulating ability generated by the eyes by staring at the optotype at the visible position, so that the residual aberration depth meets the correction capability of a liquid crystal corrector, and the correcting range of a liquid crystal adaptive system is increased ...

Method for measuring response matrix of liquid crystal corrector through least square method

The invention belongs to the field of adaptive optics and provides a method for measuring a response matrix of a liquid crystal corrector through a least square method. Zernike mode wave surfaces composed of large quantity of random coefficients are adopted in the method, the calculated wave surfaces are sequentially applied to the liquid crystal corrector, and light dot matrix slope data corresponding to the wave surfaces are sequentially detected through a Hartmann wavefront detector to form a measurement matrix. Furthermore, errors in measurement are eliminated through the calculation relation between the measurement matrix and a response matrix and the least square matrix method, and an accurate response matrix is obtained. Fiber optic bundle self-adaption correction imaging under turbulent flow interference is conducted through the response matrixes of conventional measurement and least square method measurement respectively. As shown in the figure, (a) is before correction, and (b ...