迈克尔逊干涉仪的摆臂扫描控制

摆臂式迈克尔逊干涉仪可在相对较小空间内实现长光程差扫描,并具有对振动影响灵敏度低等优点,适用于完成空间光谱探测。为实现高信噪比、高光谱分辨率的光谱探测性能,干涉仪需对干涉光程完成精密等速扫描,并要求对扫描轴系上的力学扰动具有良好的鲁棒性能。首先描述了星载摆臂式迈克尔逊干涉仪的数学模型。在此基础上,针对挠性轴系存在的固有谐振频率,研究通过微分反馈有效调整被控对象的谐振特性。确定了系统阻尼比与反馈环节参数的关系,并提出了基于ISE的控制器参数优化方法。仿真试验表明,所提出的控制方法可实现高精度的干涉光程扫描,并对空间振动具有较好的抑制能力,可有效应用于空间迈克尔逊干涉仪控制中。

Arm Scanning Control of Michelson Interferometer

The swing arm Michelson interferometer can achieve long optical path difference scan in a relatively small space, and it is insensitive to the vibration impact. So it is applied to the spatial spectral detection. In order to complete spectral detection performance in high signal to noise ratio, high spectral resolution, the interferometer needs to complete precision scanning for the optical path and require a good robust performance for the mechanical perturbation on the scanning shaft. This paper formulates the mathematical model of the swing arm Michelson interferometer. On this basis, for the inherent resonant frequency of the flexible shaft, researching regulate the resonance characteristics of the controlled object through the differentical feedback which determines the relation of the system damping ratio parameter and the feedback part, and ISE-based controller parameters optimization method is put forward. The simulation results show that the proposed control method can achieve high-precision interference optical path scan and it has the better ability to inhibit the vibration of the space which could be better used in space Michelson interferometer control.