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LISA, the laser interferometer space antenna, requires the ultimate in lasers, clocks, and drag-free control

机译：LIsa是激光干涉仪空间天线，需要极致的激光，时钟和无拖曳控制

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摘要

The existence of gravitational waves is the most prominent of Einstein's predictions that has not yet been directly verified. The space project LISA shares its goal and principle of operation with the ground-based interferometers currently being operated, the detection and measurement of gravitational waves by laser interferometry. Ground and space detection differ in their frequency ranges, and thus in the detectable sources. Toward low frequencies, ground-based detection is limited by seismic noise, and yet more fundamentally by "gravity-gradient noise," thus covering the range from a few Hz on upward to a few kHz. It is only in space that detection of signals below, say, 1 Hz is possible, opening a wide window to a different class of interesting sources of gravitational waves. The project LISA consists of three spacecraft in heliocentric orbits, forming a triangle of 5 million km sides. A technology demonstrator, the LISA Pathfinder, designed to test vital LISA technologies, is to be launched by ESA in 2009. LISA will face great challenges in reducing measurement noise, and thus, it will very strongly depend on the technologies of lasers, clocks, and drag-free control.
机译：引力波的存在是爱因斯坦预言中最突出的，但尚未得到直接验证。 LISA太空项目与当前正在运行的地面干涉仪，通过激光干涉法检测和测量引力波共享其目标和工作原理。地面和空间探测的频率范围不同，因此可探测的源也不同。对于低频，基于地面的检测受到地震噪声的限制，并且从根本上受到“重力梯度噪声”的限制，因此覆盖了从几赫兹到几千赫兹的范围。只有在空间中，才可能检测低于1 Hz的信号，从而为不同类别的引力波源打开了宽阔的窗口。 LISA项目由三架日心轨道的航天器组成，形成了500万公里边的三角形。 ESA将于2009年推出技术演示器LISA Pathfinder，旨在测试重要的LISA技术。LISA在降低测量噪声方面将面临巨大挑战，因此，它在很大程度上将取决于激光，时钟，和无拖曳控制。

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