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>−(10^0.929T-42.4−1)×100 (where T<42.3); and

P≧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.

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>−(10^0.929T-42.4−1)×100(where T<42.3); and

P≧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.

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 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.

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 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.