时滞干涉法

IF 26.3 2区 物理与天体物理 Q1 PHYSICS, PARTICLES & FIELDS
Massimo Tinto, Sanjeev V. Dhurandhar
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引用次数: 140

摘要

重力辐射的等臂探测器允许相位测量比向其臂内注入光的激光的固有相位稳定性低许多数量级。这是因为激光中的噪声对两个臂来说是共同的,经历完全相同的延迟,因此当它在光电探测器处被区分时就会被抵消。在这种情况下,低得多的二次噪声设定了整体性能。然而,如果两个臂的长度不同(就像星载干涉仪的必然情况一样),激光噪声在两个臂中经历不同的延迟,因此在光电探测器处不会直接消除。为了解决这一问题,提出了一种采用不等臂长和独立相位差读数的外差干涉测量技术。它依赖于适当的时移和线性组合的独立多普勒测量,因此被称为延时干涉测量(TDI)。本文概述了与TDI实现相关的理论、数学基础和实验方面。虽然本文强调了TDI在激光干涉仪空间天线任务中的应用,但TDI可以被纳入任何未来旨在通过干涉测量来搜索引力波的天基任务的设计中。我们有意省略了数据分析师在分析TDI数据组合时需要考虑的所有理论方面。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Time-delay interferometry

Time-delay interferometry

Equal-arm detectors of gravitational radiation allow phase measurements many orders of magnitude below the intrinsic phase stability of the laser injecting light into their arms. This is because the noise in the laser light is common to both arms, experiencing exactly the same delay, and thus cancels when it is differenced at the photo detector. In this situation, much lower level secondary noises then set the overall performance. If, however, the two arms have different lengths (as will necessarily be the case with space-borne interferometers), the laser noise experiences different delays in the two arms and will hence not directly cancel at the photo detector. To solve this problem, a technique involving heterodyne interferometry with unequal arm lengths and independent phase-difference readouts has been proposed. It relies on properly time-shifting and linearly combining independent Doppler measurements, and for this reason it has been called time-delay interferometry (TDI). This article provides an overview of the theory, mathematical foundations, and experimental aspects associated with the implementation of TDI. Although emphasis on the application of TDI to the Laser Interferometer Space Antenna mission appears throughout this article, TDI can be incorporated into the design of any future space-based mission aiming to search for gravitational waves via interferometric measurements. We have purposely left out all theoretical aspects that data analysts will need to account for when analyzing the TDI data combinations.

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来源期刊
Living Reviews in Relativity
Living Reviews in Relativity 物理-物理:粒子与场物理
CiteScore
69.90
自引率
0.70%
发文量
0
审稿时长
20 weeks
期刊介绍: Living Reviews in Relativity is a peer-reviewed, platinum open-access journal that publishes reviews of research across all areas of relativity. Directed towards the scientific community at or above the graduate-student level, articles are solicited from leading authorities and provide critical assessments of current research. They offer annotated insights into key literature and describe available resources, maintaining an up-to-date suite of high-quality reviews, thus embodying the "living" aspect of the journal's title. Serving as a valuable tool for the scientific community, Living Reviews in Relativity is often the first stop for researchers seeking information on current work in relativity. Written by experts, the reviews cite, explain, and assess the most relevant resources in a given field, evaluating existing work and suggesting areas for further research. Attracting readers from the entire relativity community, the journal is useful for graduate students conducting literature surveys, researchers seeking the latest results in unfamiliar fields, and lecturers in need of information and visual materials for presentations at all levels.
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