83results about How to "Improve polarization characteristics" patented technology

A polarizing film includes a polyvinyl alcohol (PVA) type resin having a dichroic material impregnated therein. The polarizing film is formed by stretching the PVA type resin, such that the thickness of the polarizing film is decreased to 10 μm or less, and. The polarizing film has optical properties which satisfy conditions represented by formulae:P>−(100.929T-42.4−1)×100 (where T<42.3); andP≧99.9 (where T≧42.3)where T represents a single layer transmittance and P a polarization rate. The polarizing film can be made by providing a laminate comprising a PVA type resin layer formed on a non-crystallizable ester type thermoplastic resin substrate.

An optical film laminate includes a substrate including a crystallizable ester type thermoplastic resin in the form of a continuous web; and a polarizing film including a polyvinyl alcohol type resin layer formed on the substrate, said polarizing film including a dichroic material impregnated therein in a molecularly oriented state, wherein the polarizing film is formed by providing a laminate including the polyvinyl alcohol type resin layer formed on a substrate including a crystallizable ester type thermoplastic resin in an amorphous state and subjecting the laminate to a 2-stage stretching process including a preliminary in-air stretching and an in-boric-acid-solution stretching under a temperature maintaining the amorphous state of the substrate, such that the polyvinyl alcohol type resin layer is stretched to a thickness of 10 μm or less, the polarizing film having optical properties based on the formulae P>−(100.929T-42.4−1)×100 (where T<42.3) and P≧99.9 (where T≧42.3).

A polarizing film includes a polyvinyl alcohol (PVA) type resin having a dichroic material impregnated therein. The polarizing film is formed by stretching the PVA type resin, such that the thickness of the polarizing film is decreased to 10 μm or less, and. The polarizing film has optical properties which satisfy conditions represented by formulae:P>−(100.929T-42.4−1)×100(where T<42.3); andP≧99.9(where T≧42.3)where T represents a single layer transmittance and P a polarization rate. The polarizing film can be made by providing a laminate comprising a PVA type resin layer formed on a non-crystallizable ester type thermoplastic resin substrate.

An optically active structure (100) is provided, comprising at least two different groups (G1, G2) of optically active nanorods (104A, 104B). The groups of nanorods differ from one another in at least one of wavelength and polarization of light emitted thereby in response to pumping light. The nanorods of the same group are homogeneously aligned with a certain axis of alignment being substantially parallel or substantially perpendicular to an axis of alignment of the nanorods of at least one other group, such that the nanorods of said at least two groups have one or two axes of alignment. The optically active structure is used as colour polarized light source for displays.

A multilayer film having two kinds of films of different refractive indexes alternately stacked on each other on a substrate composed of an optical element is formed in a plurality of parallel lines, and the adjacent lines of the multilayer film are connected to each other by means of a connecting multilayer film to reinforce them. This makes it possible to provide a highly reliable optical component which shows good polarization characteristic even for a visible light of a wavelength of 400 to 700 nm and in which even when designed to have a high aspect ratio, the linear multilayer film will not fall down. There is also provided a manufacturing method that enables a fine recess / protrusion shape to be surely formed using an inexpensive manufacturing apparatus without use of any organic solvent.

The invention belongs to the technical field of all-fiber current transformers, and particularly relates to a high-precision high-reliability and all-fiber current transformer. A redundancy design method adopting active optical devices is applied so that output optical power of light source units is enabled to be more stable and stability of light source average wavelength is enhanced. A depolarization head is additionally arranged in an optical path system so that stability and measurement precision of the optical path system can be enhanced. Two beams of light are converted into electric signals to be transmitted to a signal processing unit by utilizing correlation of output light of the two output ends of a second single-mode coupler through a digital signal processing unit, and suppression of light source intensity noise is realized by utilizing a digital circuit subtraction method so that signal-to-noise ratio is enhanced and measurement precision of the system is enhanced. A low birefringence optical fiber Verdet constant and a transformation ratio error generated by change of wave plate phase delay along with temperature are enabled to be mutually compensated via an all-fiber current transformer transformation ratio temperature error automatic compensation technology so that full-temperature measurement precision of the system is enhanced.

The invention discloses a salient visual method based on polarization imaging and applicable to underwater target detection, comprising the following steps: (A) acquiring auto-registration polarization images of the same underwater position at multiple angles; (B) performing underwater image restoration based on polarization information; (C) extracting global texture features; (D) extracting color features based on global contrast; (E) fusing visual saliency features; (F) performing saliency map optimization and target extraction based on the target center and the gray gravity center; and (G) performing threshold segmentation on a final saliency map to realize underwater target detection. Salience optimization is realized by use of the target center probability, image gray gravity center and space smoothness. The background is further restrained, and the foreground is highlighted. High detection rate and high identification rate are achieved for target detection in a complicated water environment, and the real-time requirement is satisfied. The method has a good application prospect.

The invention relates to a frequency variable coupling feeding device used in boardband microstrip antenna which includes coplanar waveguide and coupling slit thereon, and a varicap device whose two pins are fixed to two sides of the center of the coupling slit of the coplanar waveguide. Feeding manner is changed by regulating the varicap device, and the provided device can switch frequency resonant points of the antenna in a very wide band thereby realizing frequency conversion when feeding for the antenna; in the state of fixed antenna dimension and fixed shape of the coupling slit, the invention can improve the antenna performance such as better bandwidth and plus only by regulating the varicap device. The invention provided device is fit for the broadband or multi-frequency wireless communication field.

The invention provides a device and detecting method for restraining polarization crosstalk measuring noise by the adoption of a light source. The device is composed of a broadband light source, a polarization device to be detected, an optical path correlator, a difference detecting device, an optical signal converting device and a signal recording device. The device is characterized in that the broadband light source is a low coherent light source with high degree of polarization, and a polarization device provided with high extinction ratio is arranged behind the light source. The detecting method comprises the steps that a polarization state controller is connected between the light source and the polarization device, and the polarizing angle of line polarization light and the polarization device are overlapped with each other seriously through adjusting the polarization state of the output light of the light source. According to the device, the high degree of polarization light source and the high extinction ratio polarization device are combined, the measuring noise in the optical coherent domain polarization can be restrained through increasing the extinction ratio of signal light injected into the device to be detected, and measuring accuracy to the device polarization feature of the device is improved. The device and detecting method for restraining polarization crosstalk measuring noise by the adoption of the light source are simple in structure, excellent in performance and easy to adjust, and can be widely applied to the field of high accuracy measuring and analyzing to optical performances of optical type polarization-maintaining devices and the like.

The invention discloses a conical four-arm sinuous antenna, which comprises a first dielectric substrate, a second dielectric substrate and a third dielectric substrate, wherein the first dielectric substrate is a hollow truncated cone, the second dielectric substrate is arranged at the top end of the first dielectric substrate; a first group of sinuous metallic arms are arranged on the outer surface of the first dielectric substrate, and a second group of sinuous metallic arms are arranged on the inner surface of the first dielectric substrate; a first group of metallic connecting bands are arranged on the upper surface of the second dielectric substrate and a second group of metallic connecting bands are arranged on the lower surface of the second dielectric substrate; the third dielectric substrate is provided with a first group of micro-strip index gradient baluns and a second group of micro-strip index gradient baluns, wherein the first group of micro-strip index gradient baluns and the second group of micro-strip index gradient baluns are connected with the corresponding signal sources respectively; the first group of sinuous metallic arms and the first group of micro-strip index gradient baluns are electrically connected with each other through the first group of metallic connecting bands and a first group of radiating elements are formed; the second group of sinuous metallic arms and the second group of micro-strip index gradient baluns are electrically connected with each other through the second group of metallic connecting bands and a second group of radiating elements are formed.

The invention belongs to the field of a compound medium and particularly relates to a nanofiber / PVDF (polyvinylidene fluoride) compound medium with a sandwich structure and a preparation method of the nanofiber / PVDF compound medium. Upper and lower layers of the sandwich structure of the compound medium are PVDF films, a middle layer is a CFO@BZT-BCT NFs / PVDF compound medium film, and the three layers of structure media are combined through hot pressing, wherein the PVDF films are prepared with a solution tape casting method through quenching treatment, and the CFO@BZT-BCT NFs / PVDF compound medium film is prepared through steps as follows: crystalized BZT-BCT NFs is prepared from a BZT-BCT spinning precursor through electrostatic spinning and high-temperature calcination, CFO is introduced, CFO@BZT-BCT NFs is prepared and subjected to surface modification with dopamine hydrochloride, finally, CFO@BZT-BCT NFs is mixed with PVDF, suspension turbid colloid is prepared and subjected to solution tape casting and quenching treatment, and the nanofiber / PVDF compound medium is prepared. The technical problems of low energy density and high dielectric loss of an inorganic filling phase / polymer based compound medium are solved.

The invention provides an antenna unit and an antenna array. The antenna unit comprises M cross-shaped metal patches, M dielectric substrates and a metal ground layer, wherein M is an integer which isgreater than 1; the ith cross-shaped metal patch and the (i+1)th cross-shaped metal path are provided with the ith dielectric substrate therebetween; the ith cross-shaped metal patch, the ith dielectric substrate and the (i+1)th cross-shaped metal patch are sequentially arranged in a laminated manner, and i is an integer between 1 and (M-1); and the Mth cross-shaped metal patch, the Mth dielectric substrate and the metal ground layer are sequentially arranged in a laminated manner. The antenna unit provided by the invention and the antenna array formed by the unit provided by the invention can have good polarization characteristics, wide operation bandwidth and good phase shift characteristics.

Grating portions made of a metal are arranged as a first layer at regular intervals on a substrate, and a filling material fills the space between adjacent ones of the grating portions. Also, as a second layer, only grating portions are likewise arranged at regular intervals on the filling material. Structures each comprising grating portions of a great pitch P are stacked one upon the other to thereby cause them to function as a deflecting plate having a small apparent pitch.

The invention relates to a polarization sensitive type non-freezing infrared detector which comprises a first-layer suspension structure, wherein the first-layer suspension structure is a non-freezing infrared detector; a second-layer suspension structure is arranged on the first-layer suspension structure; the second-layer suspension structure comprises a grating support layer and a metal grating structure arranged on the grating support layer. An optical system is simplified, and the reality and the effectiveness of images are improved. The invention further relates to a manufacturing method of the polarization sensitive type non-freezing infrared detector. The manufacturing method comprises the following steps: 1, manufacturing a second scarification layer and a grating support layer on a conventional non-freezing infrared detector without structure release; 2, manufacturing the metal grating structure; 3, performing structure release, thereby forming the polarization sensitive type non-freezing infrared detector.

The invention discloses a low-profile high-gain dual-polarized antenna, and the antenna is characterized in that the antenna comprises a feed network layer, a second dielectric substrate layer, a metal ground layer, a first dielectric substrate layer and a radiation layer, wherein the feed network layer, the second dielectric substrate layer, the metal ground layer, the first dielectric substrate layer and the radiation layer are sequentially stacked; the antenna also comprises four metal probes which vertically pass through the feed network layer, the second dielectric substrate layer, the metal ground layer, the first dielectric substrate layer and the radiation layer, and are electrically connected with the radiation layer and the feed network layer; the radiation layer comprises a circular metal paster and four T-shaped metal pasters which generate parasitic resonance; four first openings formed by the four metal probes on the radiation layer takes the circle center of the circular metal paster as the center, thereby forming four corners of a first square. According to the invention, the antenna employs the T-shaped metal pasters as parasitic resonance structure units, thereby enabling the bandwidth of the antenna to be effectively enlarged. Moreover, the T-shaped structures and the circular paster are located in the same layer, so the machining is easy, and the large-scale production is facilitated.

Disclosed are a polarizing film including a polyolefin and a dichroic dye having a solubility parameter difference between the polyolefin and the dichroic dye is less than 7.4, and a display device including the polarizing film.

The invention relates to an uncooled dual-color polarization infrared bolometer. Two polarization structures are prepared on a uncooled dual-color infrared bolometer which comprises four regions arranged in a matrix and including first and third regions and second and fourth regions. Resonant cavities with different heights are formed in the first and third regions and the second and fourth regions. The invention also relates to a method for preparing the bolometer. The method comprises steps of: preparing the resonant cavities with different heights in the first and third regions and the second and fourth regions; sputtering thermosensitive films with different square resistance values, and preparing the two polarization structures in the first and third regions and the second and fourth regions of the uncooled dual-color infrared bolometer respectively. The uncooled dual-color polarization infrared bolometer can operate in an ultralow temperature environment (-80 to -60 degrees centigrade) and an ultrahigh temperature environment (85 to 100 degrees centigrade, and has a polarization characteristic.

The present invention provides a resin-encapsulated semiconductor apparatus comprising a semiconductor device having a ferroelectric film and a surface-protective film, and an encapsulant member comprising a resin; the surface-protective film being formed of a polyimide. The present invention also provides a process for fabricating a resin-encapsulated semiconductor apparatus, comprising the steps of forming a film of a polyimide precursor composition on the surface of a semiconductor device having a ferroelectric film; heat-curing the polyimide precursor composition film to form a surface-protective film formed of a polyimide; and encapsulating, with an encapsulant resin, the semiconductor device on which the surface-protective film has been formed. The polyimide may preferably have a glass transition temperature of from 240° C. to 400° C. and a Young's modulus of from 2,600 MPa to 6 GPa. The curing may preferably be carried out at a temperature of from 230° C. to 300° C.

The invention discloses an ultra-high field intensity, ultra-short pulse and narrow-band microwave radiation field measurement system. The system is composed of a broadband double-ridge horn antenna,a microwave broadband attenuator, a high-speed microwave detector, and a high-speed digital oscilloscope, wherein the broadband double-ridge horn antenna and the microwave broadband attenuator are connected through a low-loss radio frequency coaxial cable. The invention further provides an ultra-high field intensity, ultra-short pulse and narrow-band microwave radiation field measurement method. The broadband double-ridge horn antenna is used as a front-end field receiving probe and has relatively wide applicable range; the low-loss radio frequency coaxial cable and the microwave broadband attenuator are used for transmitting and attenuating a high-power microwave pulse signal received by the front-end broadband double-ridge horn antenna, the transmission and attenuation are safe, and thedynamic range of the measurement can be improved, and the accuracy and the flexibility are provided. After performing wave detection on the microwave pulse signal by using the high-speed microwave detector, an amplitude value, rise time, the pulse width and like parameters of the signal can be measured through the oscilloscope.

The invention provides a high-performance dual-polarized radiating element, which comprises a radiation patch component, a first feed balun, a second feed balun and a power divider plate, wherein thefirst feed balun and the second feed balun are orthogonally arranged on the power divider plate; the radiation patch component is located at the upper parts of the first feed balun and the second feedbalun and comprises radiation patches and a medium carrier; the radiation patches are located at the front side of the medium carrier; and a pattern choke and coupling branches are arranged at the back side of the medium carrier. The performance of the radiating element is effectively improved through the pattern choke and the coupling branches, so that the high-performance dual-polarized radiating element has the characteristics of being wide in band, high in gain, good in polarization characteristic, good in isolation characteristic and small in boundary influence. Accordingly, the invention further discloses an isolation adjustment method for the dual-polarized radiating element. The polarization isolation is effectively improved through arranging decoupling devices at the lower partsof the radiation patches. The high-performance dual-polarized radiating element is suitable for array forming application of single array element or multi-array antennas, and especially suitable for array forming application of large-scale dense array antennas with medium and strong coupling boundaries for 5G communication.

An example of the present invention provides a quantum rod layer including: a photo-induced polymer including a base polymer aligned along a first direction and a photo-reactive group combined to the base polymer; and a quantum rod aligned along the first direction.

In a method for describing a retardation distribution of a light bundle emerging from a selected field point, which passes through a birefringent optical element contained in an optical system of a microlithographic projection exposure apparatus, a distribution of retardation vectors is determined so that precisely one direction of a retardation vector is allocated to each directionless orientation of the retardation. The retardation vector distribution is then at least approximately described as a linear superposition of predetermined vector modes with scalar superposition coefficients.

It is wave-guide structure optical gyro and its process method realized with organic polymer materials and substitutes the traditional wave-guide fiber with the organic polymer materials to manufacture the wave-guide structure optics peg-top, which comprises intervention, and resonance wave-guide structure optics gyro. Its process steps are the following: a to coat the organic polymer materials solvent on the underlay through the rotation cover method and to make single or multiple layers organic polymer thin film; b to make mask plate with metal materials according to the pre-designed ring wave-guide needed; c to make the ring wave-guide by laser etching method or ultra-violet bleaching method to form the wave-guide structure gyro.

In a method for describing, evaluating and improving optical polarization properties of a projection objective of a microlithographic projection exposure apparatus, the Jones or Stokes vectors are firstly determined at one or more points in the exit pupil of the projection objective. These are then described at least approximately as a linear superposition of predetermined vector modes with scalar superposition coefficients. The optical polarization properties can subsequently be evaluated on the basis of the superposition coefficients.

In order to provide a 3V level non-aqueous electrolyte secondary battery with a flat voltage and excellent cycle life at a high rate with low cost, the present invention provides a positive electrode represented by the formula: Li<2+-ALPHA>[Me]<4>O<8-X>, wherein 0<=alpha<0.4, 0<=x<2, and Me is a transition metal containing Mn and at least one selected from the group consisting of Ni, Cr, Fe, Co and Cu, said active material exhibiting topotactic two-phase reactions during charge and discharge.

A method and system for synthesizing controllable light beams includes a spatially modulated light source that generates electromagnetic radiation with a set of replicas of a predetermined symbol, s, positioned at desired positions (xs, ys) in an object plane o(x, y) intersecting, preferably perpendicular to, the direction of propagation of the electromagnetic radiation, and having spatial amplitudes a(x-xs, y-ys), spatial phases φ(x-xs, y-ys), and spatial polarisation vectors p(x-xs, y-ys), a Fourier transforming lens for Fourier transforming the electromagnetic radiation, a first spatial light modulator for phase shifting the transformed electromagnetic radiation with the phase −Φ(u, v) of S*, S* the complex conjugate of the transformed symbol, a Fourier transforming lens for Inverse Fourier transforming the spatially modulated radiation, a set of light beams are formed propagating through the inverse Fourier plane (x′, y′) at desired positions (x′s, y′s), and a controller for controlling the position of a replica of the symbol, for movement of the light beam.