利用自然导星分析CANARY的天空MOAO性能
Analysis of on-sky MOAO performance of CANARY using natural guide stars
摘要：
分析了多目标自适应光学（MOAO）演示器CANARY获得的第一个天空结果。这些数据是在2010年9月底由威廉·赫歇尔望远镜记录的。我们描述了运行过程中使用的命令和校准算法，并提出了观察条件。处理后的数据是MOAO环路占用或脱离的斜率缓冲区，包括并行运行的四个自然引导星（NGS）波前传感器的同步测量和近红外（IR）图像。我们描述的方法，我们用来建立错误预算的金丝雀。我们能够评估层析成像和开环误差，其中值分别约为216 nm和110 nm。此外，我们确定了一个意想不到的残留准静态场像差项的平均值为110 nm。我们提出了详细的误差预算分析的三组数据为三个不同的时间序列。我们比较实验预算与数值模拟的，并表现出良好的协议。我们还发现，从斜率缓冲区和测量的Strehl比的IR图像上，在10%和20%之间的范围在1 530 nm的计算误差预算之间的一个很好的协议。这些结果使我们有信心在我们的能力，建立未来MOAO仪器的误差预算。
英文摘要：
The first on-sky results obtained by CANARY, the Multi-Object Adaptive Optics (MOAO) demonstrator, are analysed. The data were recorded at the William Herschel Telescope, at the end of September 2010. We describe the command and calibrations algorithms used during the run and present the observing conditions. The processed data are MOAO-loop engaged or disengaged slope buffers, comprising the synchronised measurements of the four Natural Guide Stars (NGS) wavefront sensors running in parallel, and near Infra-Red (IR) images. We describe the method we use to establish the error budget of CANARY. We are able to evaluate the to- mographic and the open loop errors, having median values around 216 nm and 110 nm respectively. In addition, we identify an unexpected residual quasi-static field aberration term of mean value 110 nm. We present the detailed error budget analysed for three sets of data for three different asterisms. We compare the experimental budgets with the numerically simulated ones and demonstrate a good agreement. We find also a good agreement between the computed error budget from the slope buffers and the measured Strehl ratio on the IR images, ranging between 10% and 20% at 1 530 nm. These results make us confident in our ability to establish the error budget of future MOAO instruments.
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