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Optical truss and retroreflector modeling for picometer laser metrology

机译：用于皮秒激光计量的光学桁架和后向反射器建模

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Abstract: Space-based astrometric interferometer concepts typically have a requirement for the measurement of the internal dimensions of the instrument to accuracies in the picometer range. While this level of resolution has already been achieved for certain special types of laser gauges, techniques for picometer-level accuracy need to be developed to enable all the various kinds of laser gauges needed for space-based interferometers. Systematic errors due to retroreflector imperfections become important as soon as the retroreflector is allowed to either translate in position or articulate in angle away from its nominal zero-point. Also, when combining several laser interferometers to form a three- dimensional laser gauge (a laser optical truss), systematic errors due to imperfect knowledge of the truss geometry are important as the retroreflector translates away from its nominal zero-point. In order to assess the astrometric performance of a proposed instrument, it is necessary to determine how the effects of an imperfect laser metrology system impact the astrometric accuracy. This paper show the development of an error propagation model from errors in the 1-D metrology measurements through the impact on the overall astrometric accuracy for OSI. Simulations are then presented based on this development which were used to define a multiplier which determines the 1-D metrology accuracy required to produce a given amount of fringe position error.!5
机译：摘要：天基天文干涉仪的概念通常要求测量仪器的内部尺寸以达到皮克计范围内的精度。尽管对于某些特殊类型的激光测量仪已经达到了这种分辨率的水平，但仍需要开发用于达到皮米级精度的技术，以实现天基干涉仪所需的所有各种激光测量仪。一旦允许后向反射器平移位置或使其角度偏离其名义零点，则由于后向反射器缺陷而引起的系统误差就变得很重要。另外，当组合多个激光干涉仪以形成三维激光测量仪（激光光学桁架）时，由于对后向反射器的偏离是从标称零点平移，因此由于对桁架几何形状的不完全了解而导致的系统误差非常重要。为了评估所提出仪器的天体测量性能，有必要确定不完善的激光计量系统的影响如何影响天体测量精度。本文显示了从一维计量测量中的误差到对OSI整体天文精度的影响，开发了误差传播模型。然后基于此开发成果提供仿真，该仿真用于定义一个乘法器，该乘法器确定产生给定数量的条纹位置误差所需的一维度量精度。！5

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