AI 中文总结
研究旨在证明用光子相关方法进行10.6微米外差干涉测量的可行性及技术极限，开发实验室平台研究相关特性，得出当前探测极限，还探讨了用新探测器等降低探测极限的可能。
AI 中文摘要
对行星形成盘内部天文单位等复杂尘埃环境成像，需要千米基线和大量望远镜的专用中红外干涉测量设备，从现有设备外推技术并不简单。本文旨在证明采用光子相关方法进行中红外外差干涉测量以重组来自遥远望远镜的中红外信号的可行性，并确定此类系统当前的技术极限。为此开发了一个实验室演示平台，用光子相关器关联10微米的中红外信号，该光子相关器使用1.5微米的商用电信组件传输和关联带宽可达10吉赫兹（可直接扩展到40吉赫兹）的外差信号。利用该平台研究了光子相关外差干涉仪的噪声水平和探测极限，确认了宽带中红外信号与光子相关器的相关性，表征了系统性能并分析了噪声水平。结果表明光子相关器不限制探测，可用于用1.5微米的光纤延迟补偿10微米的自由空间延迟。在当前次优的商用红外探测器下，得出8米级望远镜1小时非相干积分的相干通量探测极限为130焦耳。还讨论了使用新探测器和基于与电信光纤链路本地振荡器同步的相干积分将探测极限降低到典型T - Tauri星（约1焦耳）的可能性。
英文摘要
The task of imaging complex dust environments such as the inner astronomical units of a planet-forming disks requires dedicated mid-infrared (MIR) interferometric facilities with kilometric baselines and a large number of telescopes. Extrapolating technologies from current facilities is not straightforward. We aim to demonstrate the feasibility of using MIR heterodyne interferometry with a photonic correlation approach to recombine MIR signals from distant telescopes. We want to determine the current technological limits of such systems are. We developed a laboratory demonstration bench that can correlate MIR signals at 10 um with a photonic correlator. The photonic correlator uses commercially available telecom components at 1.5 um to transport and correlate heterodyne signals that could go up to 10 GHz in bandwidth, directly extendable to 40 GHz. We used the demonstration bench to study the noise levels and detection limits of a heterodyne interferometer with a photonic correlation. We confirm the correlation exhibited by wideband MIR signals with the photonic correlator, along with a characterization of the performance of the system and analyzed the noise levels. We show that the photonic correlator does not limit the detection and that it can be used to compensate for free-space delays at 10 um with a fiber delay at 1.5 um. With our current sub-optimal commercial infrared (IR) detectors, we have derived a detection limit of 130 Jy that is coherent flux for 8 m class telescopes with 1 h of incoherent integration. We discuss the possibility of lowering the detection limit down to typical T-Tauri stars (approximately 1 Jy) using new detectors and coherent integration based upon local oscillator synchronization with telecom fiber links.
DOI：10.1051/0004-6361/202660634
