论文标题
浓缩咖啡的色彩漂移
Chromatic Drift of the Espresso Fabry-Pérot Etalon
论文作者
论文摘要
在过去的十年中，白光照明的Fabry-Pérot干涉仪被确定为一种广泛使用，相对简单，可靠和成本效益的方式，以精确校准高分辨率的echelle echelle光谱仪。但是，Terrien等。 （2021年）最近报道了安装在可居住区行星发现器光谱仪上的Fabry-Pérot干涉仪的色彩漂移。特别是，他们发现eTalon有效间隙大小的变化不是通常假设的，但实际上取决于波长。在这里，我们介绍了浓缩咖啡Fabry-Pérot干涉仪的类似研究。使用跨度超过2。5年的每日校准，我们还发现了清晰的证据表明，每天几厘米/s的色度漂移，具有特征性的准振荡性依赖性对波长的特征。我们得出的结论是，这种效果可能是由介电镜涂层的老化引起的，并且期望类似的色漂移可能会影响所有用于校准天文学光谱仪的Fabry-Pérot干涉仪。但是，我们还证明了可以测量的色漂移，并原则上仅使用基于空心阴极灯光谱的标准校准进行校正。
In the last decade, white-light illuminated Fabry-Pérot interferometers wave been established as a widely used, relatively simple, reliable, and cost-effective way to precisely calibrate high-resolution echelle spectrographs. However, Terrien et al. (2021) recently reported a chromatic drift of the Fabry-Pérot interferometer installed at the Habitable-zone Planet Finder spectrograph. In particular, they found that the variation of the etalon effective gap size is not achromatic as usually assumed but in fact depends on wavelength. Here, we present a similar study of the Espresso Fabry-Pérot interferometer. Using daily calibrations spanning a period of over 2.5 years, we also find clear evidence for a chromatic drift with an amplitude of a few cm/s per day that has a characteristic, quasi-oscillatory dependence on wavelength. We conclude that this effect is probably caused by an aging of the dielectric mirror coatings and expect that similar chromatic drifts might affect all Fabry-Pérot interferometers used for calibration of astronomical spectrographs. However, we also demonstrate that the chromatic drift can be measured and in principle corrected using only standard calibrations based on hollow cathode lamp spectra.
