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Parasitic interference in classical and nulling stellar interferometry

机译:寄生干扰古典和纯粹的恒星干涉法

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A variety of instrumental effects can corrupt the observable quantities in optical or nulling stellar interferometry.One such effect is parasitic interference, which can occur inside an interferometric instrument. Because ofdiffraction effects related to beam propagation along finite size optics, or parasitic reflections inside transmittingoptics, a coherent crosstalk may occur between the beams and create a parasitic interference pattern superimposedon the genuine one. We developed an analytical approach to describe the impact of this effect on the observablesof classical and nulling stellar interferometers. Considering classical interferometry, we show that differentialphase and closure phase are both corrupted, depending on the crosstalk level and the residual piston betweenthe beams. Considering typical specifications of piston correction of ground-based interferometers (≈ 100 nm),the detection of hot Jupiter-like planets by differential phase implies a tolerance on the parasitic flux to about5% of the incident intensity. Also, we show that the closure phase relation does not remove this parasiticcontribution. The corresponding corrupted closure phase is not zero for an unresolved source, and depends onthe residual piston. Considering nulling interferometry, we show that parasitic effects modify the transmissionmap level, depending on the crosstalk level and the phase shift between primary and secondary beams. In theextreme case of a pi-phase shift, the crosstalk effect implies a decrease of the final output signal-to-noise ratio.Numerical simulations, adapted to handle consistently crosstalk, are then performed to estimate this degradationand validate our theoretical study.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
机译:各种乐器效果可能会破坏光学或零型恒星干涉测量中的可观察量。该效果是寄生干扰,其在干涉仪器内部可以发生。因为与有限尺寸光学器件沿着有限尺寸光学器件的波束传播相关的偶然效应,或者在传递内容内部寄生反射,在光束之间可能发生相干串扰并产生寄生干扰图案叠加真正的寄生干扰图案。我们开发了一种分析方法来描述对古典和零型恒星干涉仪的可观察结果的影响。考虑到经典的干涉测量,我们表明,差分相位和闭合相位均损坏,这取决于串扰水平和在光束之间的残留活塞。考虑到地基干涉仪(≈ 100nm)的活塞校正的典型规格,差分相的热木星状行星的检测意味着对入射强度的寄生通量的耐受性至约5%。此外,我们表明关闭相位关系不会删除此寄生协议。对于未解决的来源,相应的损坏闭合阶段不是零,并且取决于残留活塞。考虑到无效干涉测量,我们表明寄生效果根据串扰水平和主和次微波束之间的相移来修改传输级别级别。在Pi相移位的案例中,串扰效应意味着最终输出信噪比的减少。然后进行适于处理串扰的数值模拟,然后进行估计该降级和验证我们的理论研究。©( 2012年)版权协会照片光学仪表工程师(SPIE)。仅供个人使用的摘要下载。

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