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首页> 外文期刊>Space Science Reviews >Space-Time Metrology for the LISA Gravitational Wave Observatory, and Its Demonstration on LISA Pathfinder
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Space-Time Metrology for the LISA Gravitational Wave Observatory, and Its Demonstration on LISA Pathfinder

机译：LISA引力波天文台的时空计量学及其在LISA Pathfinder上的演示

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The paper describes the key instrumental features of LISA, and discusses its limiting sources of uncertainty. It is shown how the basic element of LISA is a “Doppler link” where the frequency of a laser beam is compared by two far apart, free falling “observers”. These observers are two of the six LISA free falling test-masses. Each of the three LISA arms carries two such Doppler links, propagating along opposite directions. It is shown that a link like this acts as a time-delayed, differential accelerometer. Its performance is limited by three main sources of disturbance. Parasitic forces accelerate the test masses relative to their geodetic trajectories. Interferometry measurement noise is interpreted as relative motion of test-masses. Finally, because of intervening optical components fixed to spacecraft, the measurement is also corrupted by the relative acceleration of spacecraft and the test mass. We analyze these sources within a unifying picture, and show that LISA has a large “science margin”. Even with a sensitivity substantially poorer of what has been calculated, LISA remains a powerful astrophysics observatory. Keywords Gravitational wave astronomy - Space-time metrology
机译：本文介绍了LISA的关键工具功能，并讨论了其不确定性的局限性。它显示了LISA的基本要素是“多普勒链路”，其中激光束的频率由两个相距很远的自由下落的“观察者”进行比较。这些观察者是六个LISA自由落体测试质量中的两个。三个LISA臂中的每个臂都携带两个这样的多普勒链路，它们沿相反的方向传播。结果表明，像这样的链接可以用作延时的差分加速度计。其性能受到三个主要干扰源的限制。寄生力使测试质量相对于它们的大地运动轨迹加速。干涉测量噪声被解释为测试质量的相对运动。最后，由于固定在航天器上的光学部件的介入，航天器和测试质量的相对加速度也会破坏测量结果。我们在统一的图片中分析了这些来源，并表明LISA具有很大的“科学余量”。即使LISA的灵敏度大大低于计算得出的值，它仍然是一个功能强大的天体物理学观测站。引力波天文学时空计量

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