摘要
在大气等晕角内,同时测量科学目标与跟踪目标的干涉条纹,可通过精密测定两段干涉条纹之间的光程差来获得微角秒级的天体测量精度.面向长基线恒星光干涉高精度天体测量提出一种基于空间调制的相位测量方法,通过偏振调制实现同步移相,可实现相位级的光程差测量,通过多次测量统计平均的方式进一步提高光程差检测精度.通过数值仿真与实验论证了上述相位检测方法的可行性,检测精度优于1/18波长,光程差统计测量精度优于5 nm,进一步通过环境扰动的测量分析了误差来源,为我国在建的百米级长基线天文光干涉阵列实现既定科学目标提供了技术支撑.
Measuring the interference fringes of scientific and tracking targets simultaneously within an equal optical path angle in the atmosphere can result in the accuracy of astrometry at the microarcsecond level through precise optical path difference measurement between the two interference fringes.A phase measurement method based on spatial modulation is proposed for high-precision astrometry using the long baseline stellar interferometer.Synchronous phase shifting is achieved through polarization modulation,providing phase level optical path difference measurement.And the accuracy of optical path difference detection is further improved through multiple measurements and statistical averaging.This article demonstrates the feasibility of the phase detection method through numerical simulation and experiments,with detection accuracy better than 1/18 wavelength and optical path difference statistical measurement accuracy better than 5 nm.Furthermore,the source of error is analyzed through environmental disturbance measurement,laying a technical foundation for achieving the established scientific goal of China's under construction hundred meter long baseline interferometer.
作者
魏炜
徐腾
侯永辉
孙越
WEI Wei;XU Teng;HOU Yong-hui;SUN Yue(Nanjing Institute of Astronomical Optics&Technology,Chinese Academy of Sciences,Nanjing 210042;CAS Key Laboratory of Astronomical Optics&Technology,Nanjing Institute of Astronomical Optics&Technology,Nanjing 210042;University of Chinese Academy of Sciences,Beijing 100049)
出处
《天文学报》
北大核心
2025年第3期62-68,共7页
Acta Astronomica Sinica
基金
国家自然科学基金项目(12027802)资助。
关键词
仪器:干涉仪
仪器:高角分辨率
技术:干涉测量
技术:相位检测
方法:空间调制
instrumentation:interferometers
instrumentation:high angular resolution
techniques:interferometric
techniques:phase detection
methods:spatial modulation
