标题： DIPol-UF：同时三色（$BVR$）偏振计与EM CCDs 显示英文标题

标题： DIPol-UF: simultaneous three-color ($BVR$) polarimeter with EM CCDs

摘要： 我们描述了一种新的仪器，能够以高精度（$10^{-5}$）同时在三个波段（$BVR$）进行偏振观测。 该仪器使用电子倍增EM CCD相机以实现高效率和快速图像读出。 DIPol-UF的主要特点包括：（i）具有高通光率和固有稳定性的光学设计；（ii）高度的通用性，使该仪器最适合观测明亮和暗弱目标； （iii）控制系统允许远程使用偏振计。 给出了从明亮近邻恒星的高信噪比观测以及处于平静状态的X射线双星等较暗源的第一批结果示例。 显示英文摘要

摘要： We describe a new instrument capable of high precision ($10^{-5}$) polarimetric observations simultaneously in three passbands ($BVR$). The instrument utilizes electron-multiplied EM CCD cameras for high efficiency and fast image readout. The key features of DIPol-UF are: (i) optical design with high throughput and inherent stability; (ii) great versatility which makes the instrument optimally suitable for observations of bright and faint targets; (iii) control system which allows using the polarimeter remotely. Examples are given of the first results obtained from high signal-to-noise observations of bright nearby stars and of fainter sources such as X-ray binaries in their quiescent states