Development of a digital astronomical intensity interferometer: laboratory results with thermal light

Development of a digital astronomical intensity interferometer: laboratory results with thermal light
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数字天文强度干涉仪的开发：热光实验室结果

DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
S. LeBohec
S. LeBohec
中科院分区：
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文献类型：
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作者：
N. Matthews;D. Kieda;S. LeBohec

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摘要本文介绍了利用Hanbury-Brown和Twiss干涉法和数字相关器测量热光源的二阶空间相干函数。我们证明了正交偏振之间的强度波动，或在检测器的分离大于源的空间相干长度，是不相关的，但可以用来减少系统噪声。这里所做的工作可以很容易地应用到现有的和未来的成像空气切伦科夫望远镜作为恒星强度干涉测量的星星光收集器，以测量天文物体的空间特性。
Abstract We present measurements of the second-order spatial coherence function of thermal light sources using Hanbury-Brown and Twiss interferometry with a digital correlator. We demonstrate that intensity fluctuations between orthogonal polarizations, or at detector separations greater than the spatial coherence length of the source, are uncorrelated but can be used to reduce systematic noise. The work performed here can readily be applied to existing and future Imaging Air-Cherenkov Telescopes used as star light collectors for stellar intensity interferometry to measure spatial properties of astronomical objects.