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X射线强度关联干涉测量能谱展宽校正

Energy Spectrum Broadening Correction in X-Ray Interferometry via Intensity Correlation

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摘要

1967年,第一颗脉冲星被Hewish等发现[1]。脉冲星信号具有极高的长期稳定性,可作为天然的时钟信号,在20世纪70年代就有学者提出用脉冲星进行导航的设想[2]。与传统的导航方式相比,它具有定位精度高、抗干扰能力强、无需地面支持、全轨道自主导航等优点,在深空探测中具有不可替代的优势[3]。要进行脉冲星导航,首先必须有适合导航的脉冲星星源,其位置精度要达到一定的要求,10 m量级的导航定位精度需要脉冲星的位置观测精度至少优于0.1 mas[4]。干涉法应用在星体观测中具有悠久的历史,星体干涉测量方法种类繁多,覆盖射电、可见光、红外、X射线等多个窗口。1868年Fizeau[5]首次提出用干涉法测量扩展源的角直径。1890年Michelson等[6]在美国Lick天文台的30 cm望远镜上安装了一个带有两个小孔的掩模,利用光干涉法首次成功测出木星4颗卫星的角直径。1921年Michelson等[7]在Wilson山的2.5 m反射望远镜上利用改进的干涉装置对参宿四(Betelgeuss)进行测量,首次测出太阳以外恒星的角直径。1946年,Ryle等[8]建立了第一个两单元天文观测射电干涉仪,标志着干涉测量技术在射电波段获得成功。1956年,Hanbury Brown等[9]研制出第一台强度干涉仪,并用强度干涉仪测出了天狼星的角直径。20世纪50—60年代,变基线、多基元阵列天线的射电干涉测量仪相继被建立[10]。20世纪70年代,甚长甚线干涉测量技术(VLBI)已经可把世界各地的望远镜连接起来,是目前分辨率最高的天文观测手段[11]。然而在现有的脉冲星天文观测中,射电观测分辨率受制于波长,可见光频段分辨率受制于望远镜口径,难以进一步提高。考虑到X射线波长相比可见光要短数个量级,在X射线波段有望实现更高分辨率的脉冲星观测。

Abstract

X-ray intensity correlated interferometry provides a feasible technical way to realize high-resolution pulsar information acquisition. However, the energy resolution of existing X-ray detectors is limited, and the detected X-ray signals have spectrum broadening to some extent, which may result in measurement accuracy decrease. To solve this problem, a method is proposed to correct the spectrum broadening in intensity correlated interferometry based on the scaling relationship between the coherence curves at different energies. The measurement errors before and after modification are analyzed by simulation, and the influence of noise on the correction is discussed. A simulated interferometry experiment is carried out with the visible light. The results show that the measurement values after correction are consistent with the theoretical ones, thus the effectiveness of the method is validated.

Newport宣传-MKS新实验室计划
补充资料

DOI:10.3788/AOS201939.1034001

所属栏目:X射线光学

基金项目:国家重点研发计划、国家自然科学基金重大项目;

收稿日期:2019-05-13

修改稿日期:2019-06-21

网络出版日期:2019-10-01

作者单位    点击查看

杨善初:中国科学院上海光学精密机械研究所量子光学重点实验室, 上海 201800中国科学院大学, 北京 100049
喻虹:中国科学院上海光学精密机械研究所量子光学重点实验室, 上海 201800
陆荣华:中国科学院上海光学精密机械研究所量子光学重点实验室, 上海 201800
谈志杰:中国科学院上海光学精密机械研究所量子光学重点实验室, 上海 201800中国科学院大学, 北京 100049
韩申生:中国科学院上海光学精密机械研究所量子光学重点实验室, 上海 201800

联系人作者:喻虹(yuhong@siom.ac.cn)

备注:国家重点研发计划、国家自然科学基金重大项目;

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引用该论文

Shanchu Yang,Hong Yu,Ronghua Lu,Zhijie Tan,Shensheng Han. Energy Spectrum Broadening Correction in X-Ray Interferometry via Intensity Correlation[J]. Acta Optica Sinica, 2019, 39(10): 1034001

杨善初,喻虹,陆荣华,谈志杰,韩申生. X射线强度关联干涉测量能谱展宽校正[J]. 光学学报, 2019, 39(10): 1034001

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