IC697MDL653
IC697MDL653
IC697MDL653
IC697MDL653
_________________________________________ 〖厦门光沃自动化设备有限公司 竭诚为您服务〗 〖联系人:欧先生 〗 〖手机:18030229053(微信同号) 〗 〖QQ: 2479261344 〗 〖传真:0592-5709825 【价格】如此低价,仅此一家 【货期】大量现货,下单后即可发货 【质量】全新原装,进口*** 【保障】产品经过专业检测,质保一年,15天包退换 【品牌】Allen-Bradley罗克韦尔、ABB、本特利Bently 3500系统卡件、GE、艾默生西屋等模块卡件 ______________________________________________
大气湍流很不平静,造成波前在时间和空间上的随机变化,严重影响我们拍摄恒星和系外行星图像的分辨率和精确性。 在天文自适应系统中,用于天文观测的相机和用于波前检测的相机,性能需求有明显不同。天文自适应光学的应用效果,取决于我们能否找到能精确测量波阵面畸变的参照物。 因此波前传感需要引入一个参考星。如果能找到这样的星:它与我们要观测的星非常的近,我们称之为自然导星。有时候,如果被观测星亮度足够,而且光学边界锐利的的话,有时候也能被当做参考星。 波前测量在可见光波段,而观测在红外波段;或波前测量和观测均在红外波段(如参考星在可见光区域亮度不足)。此时基于可见光传感器的自适应光学系统,通过低噪声短波红外(或更好的可见光增强短波)相机,则可以看到暗导星,因为星的密度在红外波段(J,h,K,)要高于可见光。换言之,红外导星更易找到。 波前计算必须快速(典型值是1ms内),以跟上大气状态的改变,这样有必要用高速高灵敏相机作为波前传感,用短曝光时间去“冻结”大气湍流的影响。高帧频和低延迟用于校正信息实时传递到变形镜,以实时修正波前。另外,相对明亮的导星和高灵敏度探测器是波前检测系统获得足够信噪比的保证。
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