Systematic errors in nulling interferometers.
Systematic errors in nulling interferometers.
复制标题
调零干涉仪中的系统误差。
作者：
O. Lay
消零干涉仪结合了轴上抑制和高角度分辨率，使其成为直接探测靠近其母星的微弱行星的理想工具。分析表明，由零深度波动引起的系统误差影响了仪器的性能。振幅和相位误差的二阶组合是主要的贡献者。在计算的例子中，探测一颗以15pc的距离围绕类太阳恒星运行的类地行星，要求干涉仪的臂必须相位到大约1.5 nm以内，并且其振幅匹配到大约0.1%。
Nulling interferometers combine on-axis suppression with high angular resolution, making them ideal instruments for the direct detection of faint planets close to their parent star. Analysis is developed to show that it is systematic errors, resulting from fluctuations in the null depth, that drive the instrument performance. A second-order combination of amplitude and phase errors is the dominant contributor. In the calculated example, the detection of an Earthlike planet around a Sunlike star at 15 pc requires that the arms of the interferometer must be phased to within approximately 1.5 nm and have their amplitudes matched to approximately 0.1%.