A New Comb Circular Polarizer Suitable for Millimeter‐Band Application

This letter presents a new polarizer which has a simple comb structure inside a circular waveguide. The electrical performance of the proposed comb polarizer is optimized by a circular waveguide radius and by the physical parameters of the comb plates. This polarizer is suitable for providing good performance in millimeter‐band application because of its simple structure and low fabrication cost. In our experiments the dual‐band comb polarizer designed in band 1(K) and band 2(Ka) showed good electrical performance without any tuning elements.     

Wideband reflecting frequency-selective surface polarizer for X-band applications

This paper proposed the design of a broadband linear-to-circular reflecting polarizer for X-band applications. The polarizer is designed with three-arm dipole-shaped unit cells with a full ground plane to get wideband performance. The incident linear polarized wave is converted to a right-handed circularly polarized wave upon reflection from the polarizer. The footprint of the unit cell is 9 × 9 mm, which is printed on a FR-4 substrate. Fabricated prototype is measured for its performances like polarization conversion ratio (PCR), fractional bandwidth, and aperture efficiency. The PCR is about 97%, and the fractional bandwidth is 64% with the aperture efficiency of more than 80%. Polarizer performance is analyzed in transverse electric and transverse magnetic modes, and they are stable up to 40° of various incident angles. The polarizer exhibits the 3-dB axial ratio bandwidth from 8 to 12 GHz, which is suitable for satellite applications.     

气溶胶偏振探测仪检偏器方位角优化

非理想透镜组的偏振效应引起偏振测量系统的测量矩阵改变,导致系统最佳配置漂移.为了最大化气溶胶偏振探测仪的信噪比,利用Jones矩阵的方法计算前置光学透镜组的起偏度,并分别以系统分析矩阵的条件数和参数Tr(BBT)为优化参数对检偏器的放置角度进行优化.经过优化,得到检偏器的最佳方位角,在670 nm通道系统分析矩阵的条件数由1.836 0降为1.689 4,在1 641 nm通道系统分析矩阵的条件数由1.977 7降为1.771 4.结果表明,两种优化方法的结果基本一致,经过优化之后两个偏振测量通道的信噪比都提升10%左右.     

直接染料色相特性在染料系偏光膜的应用初探

直接紫01、直接蓝02、直接黄03标准溶液色相系数分别为-0.8498、-3.117、-2.4441,不同染料标准溶液具有不同的色相特性。将直接染料色相特性应用于进料色相检验、染色液色相检测、染色液组成比例测定等,从源头确保染料色相稳定,监控了染色液的色相变化,对于保证染料系偏光膜产品的品质稳定具有重要的意义。     

液晶显示器用偏光片

从偏光片的工作原理和基本结构入手,介绍了组成偏光片的各种膜层的功能与研究现状,以及偏光片的研究发展动向.对偏光片的研究与产业发展提出了几点建议.     

Current status and future prospect of in‐cell‐polarizer technology

Abstract— A thin‐crystalline‐film (TCF) polarizer has been developed which can be used internally in liquid‐crystal‐display cells. Based on this material, a manufacturing process has been developed for the fabrication of monochrome LCDs with internal polarizers. A new TCF polarizer material and coating equipment, developed to realize a high‐performance color TFT‐LCD, are discussed.     

宽带式隔板极化器

介绍一种宽频带隔板极化器的设计原理、设计思路及其设计实例。这种极化器具有频带宽、轴比小、圆极化端口隔离度高及体积小的特点。对其功率容量的高频仿真表明他能承受较大功率。他可广泛用于微波馈电网络系统。     

Super‐reflective color LCD with PDLC technology

Abstract— A novel reflective color LCD without polarizers has been developed using a PDLC film and a retro‐reflector. Bright color images including moving images are achievable with ambient light. This novel LCD will enable the new application area of electronic paper.     

Suppression of viewing angle dependence of organic light emitting diodes by introduction of circular polarizer with nanoporous polymer film

To improve poor viewing angle characteristics of top emission organic light emitting diodes (TEOLEDs) without any serious pixel blur phenomena, we applied a circular polarizer (CP) film modified by nanoporous polymer film (NPF). From this approach, we could improve the color shift significantly (Δu'v’ in CIE 1976 with viewing angle, from 0.0165 to 0.0114), and expand angular light emission distribution of off-axis by applying CP with NPF. We found that black color shift was little associated with NPF position change although black color was slightly faded tint by applying NPF, as like plasma display panel(PDP)’s off condition. Very interestingly, we found that the reflectance was not changed seriously whether NPF exists between glass encapsulation and CP or not. Besides, we investigated the pixel blur level when we applied different condition in encapsulation thickness and morphology of diffusing films. As a result, we found that the pixel blur phenomena can be significantly suppressed by applying thin encapsulation and NPF type diffuser film.     

3He Spin Filter for Neutrons

The strongly spin-dependent absorption of neutrons in nuclear spin-polarized ³He opens up the possibility of polarizing neutrons from reactors and spallation sources over the full kinematical range of cold, thermal and hot neutrons. This paper gives a report on the neutron spin filter (NSF) development program at Mainz. The polarization technique is based on direct optical pumping of metastable ³He atoms combined with a polarization preserving mechanical compression of the gas up to a pressure of several bar, necessary to run a NSF. The concept of a remote type of operation using detachable NSF cells is presented which requires long nuclear spin relaxation times of order 100 hours. A short survey of their use under experimental conditions, e.g. large solid-angle polarization analysis, is given. In neutron particle physics NSFs are used in precision measurements to test fundamental symmetry concepts.