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首页> 外文期刊>計測自動制御学会論文集 >Fringe tracking with the three wavelength path length modulation method in stellar optical interferometry
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Fringe tracking with the three wavelength path length modulation method in stellar optical interferometry

机译：用三个波长路径长度调制方法在恒星光学干涉法中的条纹跟踪

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This paper describes a fringe tracking system using a new method to detect an optical path length difference (optical delay) between the ray paths from the interferometer element telescopes. This system was developed and tested for a stellar optical interferometer, called Mitaka optical and infrared array (MIRA), in National Astronomical Observatory. With such a system, the center of interfrarence fringes should be tracked with an accuracy of less than a wavelength by detecting and compensating optical delay fluctuation due mainly to atmospheric turbulence in real time. Our fringe tracking system advanced in reliability and efficiency of central fringe tracking, in bandwidth and stability of servo, and in simplification of system, while fringe tracing has been succeeded at three stellar interferometers before. We adopted three wavelength path length modulation, which enables us to compare amplitude of three fringes, measuring fringe phase at all times. As a result, the largest amplitude fringe was always tracked and the time for moving to the central fringe became short in spite of one detector system. We also adopted an algorithm of moving average phase demodulation (MAPD) method to produce an optical delay error signal. A modified digital PID filter was used as a controller of servo. The MAPD method and the PID filter provided stable and fast control against to disturbance. The closed-loop bandwidth of the servo was approximately about 120 Hz. The fringe tracking error of 61nm RMS was estimated for the optical delay fluctuation model at a good seeing condition in the summer of Mitaka.
机译：本文介绍了一种使用新方法来检测来自干涉仪元件伸缩射线路径之间的光路长度差（光学延迟）的条纹跟踪系统。该系统是为国家天文观测所开发和测试的恒星光学干涉仪，称为Mitaka光学和红外阵列（Mira）。利用这种系统，应通过检测和补偿主要是实时大气湍流的光学延迟波动的精度小于波长的精度，以小于波长的精度跟踪。我们的边缘跟踪系统在中央边缘跟踪的可靠性和效率高，伺服带宽和稳定性，并简化了系统，而在三个恒星干涉仪之前已经成功地成功了。我们采用了三个波长路径长度调制，使我们能够比较三个条纹的幅度，始终测量边缘阶段。结果，始终跟踪最大幅度条纹，并且尽管有一个探测器系统，但仍然短暂地移动到中央边缘。我们还采用了一种移动平均相解调（MAPD）方法的算法来产生光学延迟误差信号。修改的数字PID过滤器用作伺服器的控制器。 MAPD方法和PID滤波器提供稳定，快速控制扰动。伺服的闭环带宽约为120 Hz。在米塔卡夏季，光延迟波动模型估计了61nm rms的条纹跟踪误差。

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