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Active optics for dynamical correction of fluctuations of atmospheric refraction on a differential optical absorption spectroscopy device

机译:有源光学器件,用于在差分光学吸收光谱仪上动态校正大气折射的波动

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摘要

We have designed and developed a feedback mechanism for continuous monitoring in a long-pass differential optical absorption spectroscopy (LP-DOAS) setup. This allows one to correct photo-thermal deflection due to the local fluctuations refraction index of the air. For this purpose, using an unbalanced beam splitter, a small fraction of the collected DOAS signal is imaged onto a low-cost CCD camera using a biconvex lens, while the other portion of the signal is coupled into a fiber optic for trace gas detection. By monitoring the registered signal at the CCD camera, a feedback mechanism acting on the transversal position of the lens is able to compensate an arbitrary transversal displacement of the collected signal at the focal plane of the receiver telescope, allowing an optimal coupling into the optical fiber.
机译:我们已经设计并开发了一种反馈机制,用于在长通差分光学吸收光谱(LP-DOAS)设置中进行连续监控。由于空气的局部波动折射率,这允许纠正光热偏转。为此,使用不平衡分束器,使用双凸透镜将一小部分收集的DOAS信号成像到低成本CCD摄像机上,而信号的另一部分则耦合到光纤中以检测痕量气体。通过在CCD摄像机上监视记录的信号,作用在透镜横向位置上的反馈机制能够补偿在接收器望远镜焦平面处收集到的信号的任意横向位移,从而实现与光纤的最佳耦合。

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