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Spectroradiometric calibration of telescopes using laser illumination of flat field screens

机译:使用平场屏幕的激光照明对望远镜进行光谱辐射定标

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It is standard practice at many telescopes to take a series of flat field images prior to an observation run. Typically the flat field consists of a screen mounted inside the telescope dome that is uniformly illuminated with a broadband light source. These flat field images are useful for characterizing the relative response of CCD pixels to light passing through the telescope optics and filters, but carry limited spectral information and are not calibrated for absolute flux.rnWe present the results of performing in situ, spectroradiometric calibrations of a 1.2 m telescope at the Fred Lawrence Whipple Observatory, Mt. Hopkins, AZ. To perform a spectroradiometric calibration, a laser, tunable through the visible to near infrared, was coupled into an optical fiber and used to illuminate the flat field screen in situ at the telescope facility. A NIST traceable, calibrated photodiode was mounted on the telescope to measure the spectral flux reaching the aperture. For a particular filter, images of the screen were then captured for each laser wavelength as the wavelength was tuned over the filter bandpass. Knowledge of the incident flux then allows the relative responsivity of each CCD pixel at each wavelength to be calculated.
机译:在观察运行之前,许多望远镜的标准做法是拍摄一系列平场图像。通常,平场由安装在望远镜圆顶内部的屏幕组成,该屏幕由宽带光源均匀照明。这些平场图像可用于表征CCD像素对通过望远镜光学元件和滤光片的光的相对响应,但它们携带的光谱信息有限,并且未针对绝对通量进行校准。rn我们提供了对原位,光谱辐射定标的结果。富士山弗雷德·劳伦斯·惠普尔天文台的1.2 m望远镜亚利桑那州霍普金斯。为了执行光谱辐射定标,将可通过可见光转换为近红外光的激光耦合到光纤中,并用于在望远镜设施现场照亮平面场屏幕。将NIST可追溯,校准的光电二极管安装在望远镜上,以测量到达孔径的光谱通量。对于特定的滤光片,然后在滤光片带通上调谐波长时,针对每个激光波长捕获屏幕图像。了解入射光通量后,就可以计算每个CCD像素在每个波长下的相对响应度。

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